WO2012149764A1 - 光通信系统中的波长分配方法、光网络单元及光网络系统 - Google Patents

光通信系统中的波长分配方法、光网络单元及光网络系统 Download PDF

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Publication number
WO2012149764A1
WO2012149764A1 PCT/CN2011/080047 CN2011080047W WO2012149764A1 WO 2012149764 A1 WO2012149764 A1 WO 2012149764A1 CN 2011080047 W CN2011080047 W CN 2011080047W WO 2012149764 A1 WO2012149764 A1 WO 2012149764A1
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WIPO (PCT)
Prior art keywords
wavelength
service provider
optical network
network unit
optical
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Ceased
Application number
PCT/CN2011/080047
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English (en)
French (fr)
Inventor
叶飞
高建河
周小平
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2011/080047 priority Critical patent/WO2012149764A1/zh
Priority to EP11864829.4A priority patent/EP2753010A4/en
Priority to CN2011800017863A priority patent/CN102388557A/zh
Publication of WO2012149764A1 publication Critical patent/WO2012149764A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0282—WDM tree architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU

Definitions

  • Wavelength distribution method optical network unit and optical network system in optical communication system
  • the present invention relates to the field of communications, and in particular, to a wavelength distribution method, an optical network unit, and an optical network system in an optical communication system.
  • a hybrid passive optical network (PON) based on Wavelength Division Multiplexing/Time Division Multiplexing (WDM/TDM) technology combines WDM and TDM technologies.
  • a message sent by an Optical Line Terminal (OLT) to an Optical Network Unit (ONU) is called a downlink message, and a wavelength carrying a downlink message is called a downlink wavelength;
  • the message sent by the OLT is called an uplink message, and the wavelength that carries the uplink message is called an uplink wavelength.
  • the downlink data of each OLT is coexisted in the WDM mode, and the downlink data of each wavelength is transmitted to each ONU in the TDM mode through an optical distribution network (ODN), and each ONU receives downlink data according to the identifier allocated by the OLT;
  • ODN optical distribution network
  • Embodiments of the present invention provide a wavelength distribution method, an optical network unit, and an optical network system in an optical communication system, which can set an operating wavelength of an optical module according to service provider information, simplify a wavelength distribution process, and improve a user experience. degree.
  • a wavelength distribution method in an optical communication system comprising:
  • wavelength allocation table includes: a service provider, wavelength information corresponding to the service provider;
  • An optical network unit comprising:
  • An information setting unit configured to preset a wavelength allocation table on the optical network unit, where the wavelength allocation table includes: service provider information, wavelength information corresponding to the service provider;
  • a wavelength selection unit configured to obtain, by using the wavelength allocation table, wavelength information corresponding to a service provider where the optical network unit is located according to a service provider where the optical network unit is located; and obtaining the light according to the The wavelength information corresponding to the service provider where the network unit is located, transmitting or receiving an optical signal.
  • An optical network system comprising: an optical line termination and at least one of the optical network units described above.
  • An embodiment of the present invention provides a wavelength allocation method, an optical network unit, and an optical network system in an optical communication system.
  • the wavelength allocation table is configured by using a wavelength allocation table in advance, where the wavelength allocation table includes: a service provider, and the Wavelength information corresponding to the service provider, according to the service provider where the optical network unit is located, obtaining, by the wavelength allocation table, wavelength information corresponding to the service provider where the optical network unit is located; according to the obtained and The wavelength information corresponding to the service provider where the optical network unit is located, transmitting or receiving optical signals, simplifies the process of wavelength allocation, improves service quality, and improves user experience.
  • FIG. 1 is a schematic flowchart of a wavelength allocation method in an optical communication system according to Embodiment 1;
  • FIG. 2 is a schematic flowchart of a wavelength allocation method in an optical communication system according to Embodiment 2;
  • Embodiment 4 is a block diagram of another optical network unit provided by Embodiment 3.
  • FIG. 5 is an optical network system provided in Embodiment 3. detailed description
  • An embodiment of the present invention provides a wavelength allocation method in an optical communication system. As shown in FIG. 1, the method includes the following steps:
  • the wavelength allocation table includes: service provider information, and wavelength information corresponding to the service provider.
  • the wavelength information corresponding to the service provider includes: an uplink wavelength corresponding to the service provider, or an uplink wavelength corresponding to the service provider, or the service.
  • the wavelength information corresponding to the provider includes: an uplink wavelength and a downlink wavelength corresponding to the service provider.
  • the uplink wavelength is a wavelength used by the ONU to the uplink direction of the OLT.
  • the ONU sends an optical signal to the OLT through the uplink wavelength.
  • the downlink wavelength is a wavelength used by the OLT to the ONU in the downlink direction, and the downlink wavelength is adopted.
  • the ONU can receive the optical signal sent by the OLT to the ONU.
  • the uplink or downlink wavelength may be an actual wavelength value, a relative wavelength value, or a number of a wavelength grid. If it is a relative wavelength value, the ONU needs to pre-store the reference wavelength value. The actual wavelength value is equal to the reference wavelength value plus the relative wavelength value. If it is the number of the wavelength grid, the ONU needs a correspondence table between the pre-stored number and the actual wavelength value. The actual wavelength can be obtained by looking up the table according to the number.
  • the method may further include:
  • the ONU receives the first message sent by the OLT, where the first message includes: a service provider, wavelength information corresponding to the service provider, where the first message is a physical layer operation and maintenance message, or an optical network unit management and control Interface protocol message, or simple network management protocol message.
  • the ONU sets a wavelength allocation table according to the first message, and the wavelength allocation table may be stored on the ONU or may not be stored. If the wavelength allocation table is stored on the ONU, the aging time needs to be set, and the content in the wavelength allocation table is periodically updated according to the set aging time.
  • the unregistered ONU After the unregistered ONU is powered on, it selects a downlink wavelength (that is, the receiving wavelength, which is used to receive the information sent by the OLT), and sets the selected downlink wavelength to the ONU. Temporary operating wavelength of the tunable receiver of the optical module. Thus, the tunable receiver of the optical module in the ONU can receive the first message sent by the OLT.
  • the OLT side stores the wavelength information corresponding to the service provider and the service provider, and the OLT periodically performs the ONU automatic discovery process, and broadcasts the first message including the foregoing wavelength information on all downlink wavelengths, and then The temporary working wavelength set by the registered ONU receives the first message sent by the optical line terminal OLT including the service provider and the wavelength information corresponding to the service provider. 102.
  • the ONU obtains, by using the wavelength allocation table, the wavelength information corresponding to the service provider where the ONU is located, according to the service provider where the ONU is located.
  • the service provider information of the ONU may be set and stored on the ONU when the service provider distributes the ONU to the user or installs the ONU, or may be the ONU of the user according to the tool or method provided by the service provider. To make settings, you need to update this information. After the ONU is registered, the service provider or network operator can remotely update through the network.
  • the ONU searches for a set wavelength allocation table according to the service provider to which it belongs, selects an uplink wavelength corresponding to the service provider to which it belongs, and a downlink wavelength.
  • the ONU sends or receives an optical signal according to the obtained wavelength information corresponding to the service provider where the ONU is located. It is set to the operating wavelength of the ONU, and transmits or receives an optical signal through the operating wavelength of the ONU.
  • the working wavelength of the ONU is the working wavelength of the optical module in the ONU, and specifically includes: an operating wavelength of the adjustable transmitter in the optical module (ie, an upstream wavelength), and an operating wavelength of the tunable receiver in the optical module (ie, Downstream wavelength), the tunable transmitter transmits an uplink optical signal by using an uplink wavelength, and the tunable receiver receives the downlink optical signal by using a downlink wavelength.
  • the long or downstream wavelength is transmitted or received by the obtained upstream wavelength or downlink wavelength.
  • An embodiment of the present invention provides a wavelength allocation method in an optical communication system, where a wavelength allocation table is set in advance on an optical network unit, where the wavelength allocation table includes: service provider information, wavelength information corresponding to the service provider. Obtaining, according to the service provider where the optical network unit is located, wavelength information corresponding to the service provider where the optical network unit is located, according to the obtained service provided by the optical network unit. The wavelength information corresponding to the quotient, transmitting or receiving the optical signal simplifies the process of wavelength allocation, improves the quality of the service, and improves the user experience.
  • Example 2 Example 2:
  • the embodiment of the invention provides a wavelength allocation method in an optical communication system. As shown in FIG. 2, the method includes the following steps:
  • the ONU After the ONU is powered on, select a downlink wavelength and set it as the temporary working wavelength of the optical module.
  • the unregistered ONU After the unregistered ONU is powered on, it will randomly select a downlink wavelength in its pre-stored downlink wavelength, and set the selected downstream wavelength to the temporary working wavelength of the tunable receiver of the optical module in the ONU. And receiving the first message delivered by the OLT, where the first message includes: a monthly service provider, and wavelength information corresponding to the service provider.
  • the ONU receives the first message sent by the optical line terminal OLT, where the first message includes: a service provider, and wavelength information corresponding to the service provider.
  • the OLT periodically performs an ONU automatic discovery process, and broadcasts, on all downlink wavelengths, a first message including a service provider and wavelength information corresponding to the service provider, and the ONU receives the first message by using a temporary working wavelength.
  • the service provider can be represented by the identifier of the service provider.
  • the service provider's identity is an identifier that is recognized by each service provider and is globally unique to each service provider.
  • the bandwidth usage is the real-time statistics of the OLT's bandwidth usage on the upstream or downstream wavelengths of the service provider. Generally, the actual bandwidth used or the bandwidth (fixed bandwidth and guaranteed bandwidth) actually configured for the ONU is relative to the physical maximum bandwidth. The percentage is used as the bandwidth usage.
  • the bandwidth usage is different due to the different operating conditions of local service providers.
  • the first message may be a physical layer operation management and maintenance (PLOAM) message, an OMCI (ONU Management and Control Interface) protocol message or a simple network management (SNMP, Simple) Network Management Protocol) Protocol message.
  • PLOAM physical layer operation management and maintenance
  • OMCI ONU Management and Control Interface
  • SNMP Simple network management Protocol
  • the ONU sets a wavelength allocation table according to the first message.
  • the 0NU records the wavelength information corresponding to the service provider and the service provider in the first message to the wavelength allocation table according to the first message sent by the 0LT.
  • the wavelength allocation table may be stored on the ONU, and an aging time is set, and the wavelength allocation table is periodically updated and maintained.
  • the wavelength allocation table may be stored in any writable storage medium such as RAM, EEPROM, flash or hard disk, and may be accessed by searching, modifying, etc. according to service provider information.
  • the wavelength allocation table includes: service provider information, an uplink wavelength corresponding to the service provider, and a downlink wavelength corresponding to the service provider.
  • the bandwidth usage rate of the uplink wavelength corresponding to the service provider may also be included.
  • a bandwidth usage rate of a downlink wavelength corresponding to the service provider may also be included.
  • the ONU searches for the wavelength allocation table according to the service provider where the ONU is located, and selects a corresponding uplink wavelength or downlink wavelength from the wavelength correspondence table, and sets the working wavelength of the ONU.
  • the service provider to which the ONU belongs may be set by the service provider when distributing the ONU to the user or installing the ONU, or may be set by the user according to the tool or method provided by the service provider, and the service is provided after the ONU is registered and online.
  • the provider or network operator remotely updates the information of the service provider to which the ONU belongs via the network.
  • the working wavelength of the ONU is specifically the working wavelength of the optical module in the ONU, and the working wavelength includes: an operating wavelength of the adjustable transmitter in the optical module and an operating wavelength of the tunable receiver.
  • the tunable transmitter is used to transmit the upstream optical signal
  • the tunable receiver is used to receive the downstream optical signal.
  • the ONU After receiving the first message sent by the OLT, the ONU searches for a preset wavelength allocation table according to the service provider to which the ONU belongs, and selects wavelength information corresponding to the service provider to which the ONU belongs, such as downlink wavelength, uplink wavelength, and uplink.
  • the bandwidth usage of the wavelength or the bandwidth usage of the downstream wavelength, and the selected wavelength is set to the operating wavelength of the ONU, which is the operating wavelength of the tunable receiver of the optical module in the ONU.
  • the ONU may select the uplink wavelength and the downlink wavelength according to the additional information such as the bandwidth usage of the uplink wavelength or the downlink wavelength, for example, selecting the downlink wavelength with the lowest bandwidth usage of the downlink wavelength and the corresponding uplink wavelength as the operating wavelength of the ONU, or selecting The downlink wavelength and the uplink wavelength with the lowest bandwidth usage of the downlink wavelength and the uplink wavelength are used as the operating wavelength of the ONU.
  • the ONU may not process other messages received from the OLT during the wavelength setting process.
  • the ONU After the ONU sets the working wavelength, the specific flag in the internal memory or register is set, and the working wavelength of the ONU optical module is set. At this time, the ONU state is restored to the state just after power-on. It should be reminded that when the ONU is set to the wavelength, it will return to the state just after power-on, so the ONU needs to further determine whether the working wavelength of the ONU has been set.
  • the working wavelength can be determined by a specific flag bit. If it has been set, step 206 can be continued. If the result of the determination has not been set, steps 203-205 are performed.
  • the ONU performs an ONU registration process.
  • the ONU determines that its own working wavelength has been set, the ONU responds to the OLT by setting the uplink wavelength, and ignores (or does not process) the information related to the wavelength assignment in the downlink message, completing the ONU registration process.
  • the OLT may send the foregoing wavelength information to the ONU in multiple times, and the wavelength information sent each time includes a part of service provider information, uplink wavelength and downlink wavelength information corresponding to the service provider, and optional uplink or downlink wavelength. Additional information such as bandwidth usage can also be used to deliver all service providers, wavelength information corresponding to service providers, and so on.
  • the ONU does not find the wavelength information corresponding to the service provider information to which the ONU belongs in the wavelength allocation table, return to step 201, select another pre-stored downlink wavelength as the temporary working wavelength of the ONU, and restart the foregoing. Wavelength assignment process. If the ONU wavelength assignment fails more than a certain number of times, a fault indication signal is given and further processed by the network maintenance personnel.
  • the ONU sends or receives an optical signal according to the set working wavelength.
  • An embodiment of the present invention provides a wavelength allocation method in an optical communication system, by setting a wavelength allocation table on an ONU in advance; according to a service provider where the ONU is located, by using the wavelength allocation table, Obtaining wavelength information corresponding to the service provider where the ONU is located; transmitting or receiving an optical signal according to the obtained wavelength information corresponding to the service provider where the ONU is located, simplifying the process of wavelength allocation, and improving the service Quality improves the user experience.
  • the wavelength information further includes the bandwidth usage of the uplink wavelength or the downlink wavelength, and the bandwidth usage rate may be used to allocate different wavelengths of the same service provider, so that the service provider allocates the wavelength and bandwidth resources more reasonably.
  • Embodiment 1 and Embodiment 2 The specific flow of the above-described Embodiment 1 and Embodiment 2 will be specifically exemplified below.
  • SP1 assigns two pairs of wavelengths, ⁇ ⁇ 1 ⁇ ⁇ ⁇ 1 and ⁇ ⁇ 2 ⁇ ⁇ u2, depending on the actual situation.
  • the bandwidth usage rate of d1 is B1, the bandwidth usage rate of downlink wavelength d2 is B2; SP2 is assigned a pair of wavelengths ⁇ ⁇ 3 ⁇ ⁇ ⁇ 3, and the bandwidth usage rate of downlink wavelength d3 is B3; SP3 and SP4 share a pair of wavelengths ⁇ ( ⁇ ⁇ ⁇ ⁇ 4, the bandwidth usage of the downstream wavelength ⁇ d4 is B43 and B44 respectively (where ⁇ di represents the downstream wavelength, ⁇ ui represents the upstream wavelength, and i represents the number of the downstream wavelength and the upstream wavelength). Considering some service providers If bandwidth usage is not provided, the bandwidth usage defaults to 0, which is not meaningful at this time.
  • the OLT sends a PLOAM message to the ONU, where the PLOAM message includes: service provider information, wavelength information corresponding to the service provider, where the wavelength information includes: an uplink wavelength corresponding to the service provider, and
  • the downlink wavelength may optionally include additional information such as uplink bandwidth or bandwidth usage of the downlink wavelength, where the service provider may be represented by an identifier of the service provider.
  • the corresponding PLOAM message containing the above wavelength information is shown in Table 1.
  • the 1-2 bytes in the PLOAM message are the ID information of the ONU.
  • the OLT broadcasts the message to all the ONUs, and the message can be directly sent through the ONU-ID.
  • the content of the third byte is 0x14, indicating the type of the message; the fourth byte is the serial number, indicating the PLOAM serial number, which can be unicast or sent to each ONU by broadcast; 5-6
  • the content of the byte is SP-I D #0, indicating that the service provider is SP0, 7-8 bytes, indicating downlink wavelength information; 9-10 bytes indicating upstream wavelength information; bytes 11-12, Indicates the bandwidth usage rate of the uplink wavelength or the downlink wavelength; and so on, the respective bearer service providers of the following bytes are SP2, SP3, etc., and the wavelength information corresponding to the service provider; 37-40 bytes are pre- Leave field; 41-48 bytes is the check information bit.
  • the content represented by each of the above bytes is not the only representation, and can be adjusted according to the byte, and the number of bytes is not unique, and can be adjusted according to the content.
  • the service provider to which the ONU belongs is the service provider SP3.
  • a downlink wavelength ⁇ d1 is randomly selected in the downlink wavelengths ⁇ d1 , d2 , d3 , and ⁇ d4 prestored by the system , and ⁇ d1 is set as the temporary working wavelength of the tunable receiver of the ONU optical module.
  • the OLT periodically performs the ONU automatic discovery process to broadcast downlink messages containing wavelength-related information on all downstream wavelengths.
  • the registered ONUs will ignore this information, and the unregistered ONUs will be judged by specific flags in the internal memory or registers. Whether the working wavelength of the optical module is set. For example, the unregistered ONU1 determines that the operating wavelength of its own optical module is not set.
  • the ONU1 receives the downlink PLOAM message by using the set temporary working wavelength, where the PLOAM message includes: a service provider, and wavelength information corresponding to the service provider.
  • the ON U1 records the wavelength information corresponding to the service provider and the service provider in the received PLOAM message to the set wavelength allocation table.
  • the wavelength allocation table is as shown in Table 2:
  • the ONU1 According to the content shown in Table 2, the ONU1 according to the PLOAM message sent by the OLT, the wavelength information corresponding to the service provider and the service provider carried in the message, and the bandwidth of the wavelength.
  • the usage rates are categorized separately and are filled in Table 2.
  • the bandwidth usage rate of the wavelength is optional.
  • the content of each entry in the foregoing Table 2 may be sent to the ONU1 by the OLT, or may be sent to the ONU1 multiple times.
  • the ONU1 searches for the wavelength information corresponding to the SP3 from the wavelength allocation table according to the identifier of the pre-stored service provider information SP3, selects the downlink wavelength ⁇ d4 and the uplink wavelength ⁇ ⁇ 4, and sets the ONU.
  • the operating wavelength that is, the adjustable transmitter of the optical module in the ONU and the operating wavelength of the tunable receiver, where ⁇ ⁇ 4 is the operating wavelength of the tunable transmitter and d4 is the operating wavelength of the tunable receiver.
  • ONU1 sets the working wavelength, sets the specific flag in the internal memory or register, marks the working wavelength of ONU1 has been set, and the state of ONU1 returns to the state just after power-on. At this time, it can be judged by the specific flag. The operating wavelength of ONU1 has been set. Then, the ONU can respond to the newly initiated ONU1 automatic discovery process of the OLT on the set upstream wavelength. At this time, the wavelength-related information is ignored, and the registration process of the ONU1 is continued (the registration process of the ONU1 is an existing process, and the description will not be repeated here. ).
  • An embodiment of the present invention provides an optical network unit ONU. As shown in FIG. 3, the ONU includes:
  • the information setting unit 31 is configured to set a wavelength allocation table on the ONU in advance, where the wavelength allocation table includes: service provider information, wavelength information corresponding to the service provider;
  • the wavelength selection unit 32 is configured to obtain, according to the service provider where the ON U is located, wavelength information corresponding to the service provider where the ONU is located, by using the wavelength allocation table, and according to the obtained information about the ONU The wavelength information corresponding to the service provider, transmitting or receiving an optical signal.
  • the ONU further includes:
  • the information receiving unit 33 is configured to receive the first message sent by the OLT, where the first message includes: a service provider, wavelength information corresponding to the service provider, where the first message is a PLOAM message, or an OMCI message, or SNMP message.
  • the information setting unit 31 is configured to set a wavelength allocation table on the optical network unit according to the first message. For the specific wavelength allocation table, refer to Table 2.
  • the information receiving unit 33 is further configured to select a downlink wavelength from the stored downlink wavelengths in advance, set the temporary working wavelength of the ONU, and receive the first message delivered by the OLT according to the temporary working wavelength.
  • the optical network unit further includes:
  • the storage unit 34 is configured to store a wavelength allocation table set by the information setting unit.
  • the wavelength selection unit is configured to: according to the service provider where the ONU is located, look up the wavelength allocation table, and select information on a wavelength corresponding to a service provider where the ONU is located, where the wavelength information includes: The upstream wavelength and downstream wavelength corresponding to the service provider.
  • the upstream wavelength and the downstream wavelength are set to an operating wavelength of the ONU, and an optical signal is transmitted or received through the operating wavelength.
  • the ONU includes: an optical module, where the optical module includes: a tunable transmitter and a tunable receiver, wherein a downlink wavelength corresponding to a service provider to which the ONU belongs is set to an operating wavelength of the tunable receiver, and the ONU passes The set downlink wavelength receives the optical signal sent by the OLT, and the uplink wavelength corresponding to the service provider to which the ONU belongs is set to the working wavelength of the adjustable transmitter, and the optical signal is sent to the OLT through the uplink wavelength.
  • the optical module includes: a tunable transmitter and a tunable receiver, wherein a downlink wavelength corresponding to a service provider to which the ONU belongs is set to an operating wavelength of the tunable receiver, and the ONU passes The set downlink wavelength receives the optical signal sent by the OLT, and the uplink wavelength corresponding to the service provider to which the ONU belongs is set to the working wavelength of the adjustable transmitter, and the optical signal is sent to the OLT through the uplink wavelength.
  • the ONU may select the uplink wavelength and the downlink wavelength according to the additional information such as the uplink wavelength or the bandwidth usage rate of the downlink message. Therefore, the wavelength information may also be The method includes: a bandwidth usage rate of an uplink wavelength corresponding to the service provider, and a bandwidth usage rate of a downlink wavelength corresponding to the service provider. E.g The downlink wavelength with the lowest bandwidth usage of the downlink wavelength and the corresponding uplink wavelength are selected as the operating wavelength of the ONU, or the downlink wavelength and the uplink wavelength with the lowest bandwidth usage of the downlink wavelength and the uplink wavelength are selected as the operating wavelength of the ONU.
  • An embodiment of the present invention provides an optical network unit, where a wavelength allocation table is set in advance by an information setting unit, where the wavelength allocation table includes: service provider information, wavelength information corresponding to the service provider; and a wavelength selection unit. And obtaining the wavelength information corresponding to the service provider where the ONU is located according to the wavelength allocation table of the ONU; and obtaining, according to the obtained wavelength information corresponding to the service provider where the ONU is located,
  • the method of transmitting or receiving an optical signal simplifies the process of wavelength allocation, improves the quality of the service, and improves the user experience.
  • the wavelength-related information further includes the bandwidth usage rate of the uplink wavelength or the downlink wavelength, and the bandwidth can be used. The usage rate allocates multiple pairs of wavelengths for the same service provider wholesale, enabling service providers to allocate wavelength and bandwidth resources more reasonably.
  • an embodiment of the present invention further provides an optical network system, where the system includes: an ONU and an OLT, where the ONU specifically includes:
  • An information setting unit configured to preset a wavelength allocation table on the ONU, where the wavelength allocation table includes: service provider information, wavelength information corresponding to the service provider;
  • a wavelength selection unit configured to obtain, according to the service provider where the ONU is located, wavelength information corresponding to the service provider where the ONU is located, and obtain the service provided by the ONU according to the obtained The wavelength information corresponding to the quotient, transmitting or receiving the optical signal.
  • the OLT is configured to send a first message to the ONU. After receiving the response message returned by the ONU, the ONU registration process is completed.
  • the optical network system shown in Figure 5 There are 4 service providers in SP1 ⁇ SP4 on the OLT-side. The network operator will distribute the wavelength according to the operation status of each service provider.
  • the OLT stores the service. Provider information and wavelength information corresponding to the service provider, the OLT periodically loads the first message on all downlink wavelengths in the system as downlink messages and sends them through Tx1 ⁇ Tx4 four transmitters.
  • WDM wavelength division multiplexing
  • ONU1 Taking ONU1 as an example, if ONU1 is registered, the first message is ignored; if ONU1 is not registered, ONU1 randomly selects a temporary working wavelength, and receives the first message sent by Tx1 of the OLT through the temporary working wavelength, and according to the above
  • the wavelength assignment method sets the working wavelength for the optical module of the ONU1, and starts the ONU1 registration process. After the ONU1 is registered, it can communicate with the OLT through the set working wavelength. The ONU1 loads the upstream optical signal on the upstream wavelength and transmits it to the OLT through the adjustable transmitter. After entering the OLT, it is received by the OLT's four receivers RxA ⁇ RxD through the WDM coupler and the wavelength demultiplexer.
  • ONU2 ⁇ ONU4 can refer to the operation of ONU1.
  • An embodiment of the present invention provides an optical network system, by setting a wavelength allocation table on an ONU; and obtaining, according to a service provider where the ONU is located, wavelength information corresponding to a service provider where the ONU is located through the wavelength allocation table; Sending or receiving an optical signal according to the obtained wavelength information corresponding to the service provider where the ON U is located simplifies the process of wavelength allocation, improves service quality, and improves user experience.

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  • Computer Networks & Wireless Communication (AREA)
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Description

光通信系统中的波长分配方法、 光网络单元及光网络系统
技术领域
本发明涉及通信领域， 尤其涉及一种光通信系统中的波长分配方法、 光 网络单元及光网络系统。
背景技术
基于波分复用 /时分复用 ( Wavelength Division Multiplexing/Time Division Multiplexing , WDM/TDM )技术的混合无源光网络（ Passive Optical Network, PON ) 结合了 WDM和 TDM技术。
在 WDM/TDM混合 PON系统中， 光线路终端 ( Optical Line Terminal, OLT ) 向光网络单元（ Optical Network Unit, ONU )发送的消息称为下行消 息， 承载下行消息的波长称为下行波长； ONU向 OLT发送的消息称为上行 消息， 承载上行消息的波长称为上行波长。 ONU 注册后， OLT 和已注册的 ONU进行正常通信。 OLT的多个下行波长上以 WDM方式共存，每个波长上 的下行数据通过光分配网络（Optical Distribution Network, ODN ) 以 TDM 方式传到各 ONU , 各 ONU根据 OLT分配的标识接收下行数据； 对 ONU而 言， 也可能存在多个 WDM波长， 每个波长上的 ONU的上行数据通过 ODN 以 TDMA的方式传输到 OLT。
在目前的混合 PON系统中， 波长分配是 OLT根据 ONU发送的序列号 进行波长分配，由于 ONU在波长分配过程中需要发送和接收信息，使得 ONU 要先调整接收波长和发送波长， 进而导致目前基于序列号分配波长的过程太 复杂， 耗时长， 用户体验差。 发明内容 本发明的实施例提供一种光通信系统中的波长分配方法、 光网络单元及 光网络系统， 可以根据服务提供商信息设置光模块的工作波长， 简化了波长 分配的流程， 提高了用户的体验程度。
为达到上述目的， 本发明的实施例采用如下技术方案：
一种光通信系统中的波长分配方法， 包括：
预先在光网络单元上设置波长分配表， 所述波长分配表包括： 服务提供 商、 与所述服务提供商对应的波长信息；
根据光网络单元所在的服务提供商， 通过所述波长分配表， 获得与所述 光网络单元所在的服务提供商对应的波长信息；
根据所述获得的与所述光网络单元所在的服务提供商对应的波长信息， 发送或者接收光信号。
一种光网络单元， 包括：
信息设置单元， 用于预先在光网络单元上设置波长分配表， 所述波长分 配表包括： 服务提供商信息、 与所述服务提供商对应的波长信息；
波长选择单元， 用于根据光网络单元所在的服务提供商， 通过所述波长 分配表， 获得与所述光网络单元所在的服务提供商对应的波长信息； 并根据 所述获得的与所述光网络单元所在的服务提供商对应的波长信息， 发送或者 接收光信号。
一种光网络系统， 包括： 光线路终端和至少一个上述的光网络单元。 本发明实施例提供一种光通信系统中的波长分配方法、 光网络单元及光 网络系统， 通过预先在光网络单元上设置波长分配表， 所述波长分配表包括： 服务提供商、 与所述服务提供商对应的波长信息； 根据光网络单元所在的服 务提供商， 通过所述波长分配表， 获得与所述光网络单元所在的服务提供商 对应的波长信息； 根据所述获得的与所述光网络单元所在的服务提供商对应 的波长信息， 发送或者接收光信号， 简化了波长分配的流程， 提升了业务质 量， 提高了用户的体验程度。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1为实施例 1提供的一种光通信系统中的波长分配方法的流程示意图； 图 2为实施例 2提供的一种光通信系统中的波长分配方法的流程示意图； 图 3为实施例 3提供的一种光网络单元的框图；
图 4为实施例 3提供的另一种光网络单元的框图；
图 5为实施例 3提供的一种光网络系统。 具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行 清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而 不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有做 出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
实施例 1：
本发明实施例提供了一种光通信系统中的波长分配方法， 如图 1 所示， 该方法包括以下步骤：
101、 预先在 ONU上设置波长分配表， 所述波长分配表包括： 服务提供 商信息、 与所述服务提供商对应的波长信息。 述服务提供商对应的上行波长， 以及与所述服务提供商对应的下行波长。 在 这里可以理解为， 所述服务提供商对应的波长信息包括： 与所述服务提供商 对应的上行波长， 或者与所述服务提供商对应的上行波长， 或者， 所述服务 提供商对应的波长信息包括：与所述服务提供商对应的上行波长和下行波长。 其中， 所述上行波长为 ONU到 OLT的上行方向采用的波长， 通过所述上行 波长， ONU发送光信号给 OLT,所述下行波长为 OLT到 ONU的下行方向采 用的波长， 通过所述下行波长， ONU可以接收 OLT发送给 ONU的光信号。 另外， 所述上行或下行波长可以是实际波长值、 相对波长值或波长网格的编 号。 如果是相对波长值， ONU需要预存基准波长值， 实际波长值等于基准波 长值加上相对波长值； 如果是波长网格的编号， ONU需要预存编号与实际波 长值之间的对应关系表， 使用时根据编号查表即可获取实际波长。 与所述服务提供商对应的上行波长的带宽使用率， 以及与所述服务提供商对 应的下行波长的带宽使用率。
进一步地， 所述步骤之前还可以包括：
ONU接收 OLT发送的第一消息， 所述第一消息包括： 服务提供商、 与 服务提供商对应的波长信息， 其中所述第一消息为物理层运行与维护消息、 或者光网络单元管理和控制接口协议消息、 或者简单网络管理协议消息。
所述 ONU 根据所述第一消息， 设置波长分配表， 该波长分配表可以存 储在 ONU上， 也可以不存储。 若 ONU上存储该波长分配表， 则需要设定老 化时间， 根据所述设定的老化时间， 定时更新该波长分配表中的内容。
具体地， 未注册的 ONU 上电后， 会在自身预存储的下行波长中随机选 择一个下行波长（即接收波长， 用于接收 OLT下发的信息）， 将选定的下行 波长设置为 ONU中光模块的可调接收机的临时工作波长。这样 ONU中光模 块的可调接收机就可以接收由 OLT发送的第一消息。
另夕卜，在 OLT侧存储有服务提供商、与服务提供商对应的波长信息， OLT 会周期性执行 ONU 自动发现过程， 在所有下行波长上广播包含有上述波长 信息的第一消息， 然后未注册的 ONU 设置的临时工作波长接收光线路终端 OLT发送的包括服务提供商、 与服务提供商对应的波长信息的第一消息。 102、 ONU根据 ONU所在的服务提供商， 通过所述波长分配表， 获得 与所述 ONU所在的服务提供商对应的波长信息。
具体地， 所述 ONU 所在的服务提供商信息， 可以是服务提供商在分发 ONU给用户或安装 ONU时设置并存储在该 ONU上， 也可以是用户根据服 务提供商提供的工具或方法对 ONU 进行设置， 需要更新该信息时， 可以在 ONU注册上线后由服务提供商或网络运营商通过网络远程更新。
所述 ONU 根据自身所属的服务提供商， 查找设置的波长分配表， 选择 与自身所属的服务提供商对应的上行波长， 以及下行波长。
103、 ONU根据所述获得的与所述 ONU所在的服务提供商对应的波长 信息， 发送或者接收光信号。 设置为所述 ONU的工作波长， 通过所述 ONU的工作波长， 发送或者接收光 信号。
其中， ONU的工作波长为 ONU中的光模块的工作波长， 具体包括： 光 模块中的可调发射机的工作波长（即上行波长）， 以及光模块中的可调接收机 的工作波长（即下行波长）， 所述可调发射机通过上行波长发送上行光信号， 可调接收机通过下行波长接收下行光信号。 长或下行波长， 通过所述获得的上行波长或下行波长发送或者接收光信号。
本发明实施例提供一种光通信系统中的波长分配方法， 通过预先在光网 络单元上设置波长分配表， 所述波长分配表包括： 服务提供商信息、 与所述 服务提供商对应的波长信息； 根据光网络单元所在的服务提供商， 通过所述 波长分配表， 获得与所述光网络单元所在的服务提供商对应的波长信息； 根 据所述获得的与所述光网络单元所在的服务提供商对应的波长信息 , 发送或 者接收光信号， 简化了波长分配的流程， 提升了业务质量， 提高了用户的体 验程度。 实施例 2:
本发明实施例提供了一种光通信系统中的波长分配方法， 如图 2所示， 该方法包括以下步骤：
201、 ONU上电后随机选择一个下行波长并将其设置为光模块的临时工 作波长。
未注册的 ONU 上电后会在自身预存储的下行波长中随机选择一个下行 波长， 将选定的下行波长设置为 ONU 中光模块的可调接收机的临时工作波 长， 该临时工作波长用来接收 OLT下发的第一消息， 所述第一消息包括： 月良 务提供商、 与服务提供商对应的波长信息。
203、 ONU接收光线路终端 OLT发送的第一消息， 所述第一消息包括： 服务提供商、 与服务提供商对应的波长信息。
具体地， OLT会周期性执行 ONU 自动发现过程， 在所有下行波长上广 播包含有服务提供商、 与服务提供商对应的波长信息的第一消息， ONU通过 临时工作波长接收所述第一消息， 与所述服务提供商对应的上行波长的带宽使用率， 以及与所述服务提供商对 应的下行波长的带宽使用率。 其中， 服务提供商可以通过服务提供商的标识 来表示。 服务提供商的标识是各服务提供商认可的、 对每个服务提供商来说 是全局唯一的标识。 带宽使用率是 OLT对服务提供商的上行波长或下行波长 上的带宽使用率的实时统计结果， 一般可以将实际使用带宽或实际给 ONU 配置的带宽 （固定带宽和保证带宽）相对于物理最大带宽的百分比作为带宽 使用率。 由于各地服务提供商的运营状况不同， 则所述带宽使用率也不同。
其中所述第一消息可以为物理层操作管理与维护 （PLOAM , Physical Layer Operation, Administration and Maintenance ) 消息、 管理和控制接口 ( OMCI , ONU Management and Control Interface )协议消息或简单网络管 理 ( SNMP, Simple Network Management Protocol )协议消息。 204、 ONU根据所述第一消息， 设置波长分配表。
0NU根据 0LT发送的第一消息， 将所述第一消息中的服务提供商、 与 服务提供商对应的波长信息记录到波长分配表中，
可选的， 所述波长分配表可以存储在 ONU 上， 并设置老化时间， 定期 更新和维护所述波长分配表。 具体地， 所述波长分配表可以存储在 RAM、 EEPROM、 flash或硬盘等任何可写的存储介质中，并且是可以根据服务提供 商信息进行查找、 修改等操作访问的。
所述波长分配表包括： 服务提供商信息、 与服务提供商对应的上行波长 以及服务提供商对应的下行波长； 可选地， 还可以包括与所述服务提供商对 应的上行波长的带宽使用率， 以及与所述服务提供商对应的下行波长的带宽 使用率。
205、 ONU根据自身所在的服务提供商， 查找所述波长分配表，， 从所述 波长对应关系表选择对应的上行波长或下行波长， 并设置为 ONU 的工作波 长。
所述 ONU所属的服务提供商，可以是服务提供商在分发 ONU给用户或 安装 ONU 时进行设置， 也可以是用户根据服务提供商提供的工具或方法进 行设置， 并在 ONU 注册上线后由服务提供商或网络运营商通过网络远程更 新所述 ONU所属的服务提供商的信息。
其中， 所述 ONU的工作波长具体为所述 ONU中的光模块的工作波长， 该工作波长包括： 光模块中的可调发射机的工作波长和可调接收机的工作波 长。 可调发射机用来发送上行光信号， 可调接收机用来接收下行光信号。
ONU在接收到 OLT发送的第一消息后，根据 ONU 自身所属的服务提供 商， 查找预先设置的波长分配表， 选择与自身所属的服务提供商对应的波长 信息， 例如下行波长、 上行波长、 上行波长的带宽使用率或者下行波长的带 宽使用率， 并将所述选择的波长设置为该 ONU的工作波长， 即为 ONU中光 模块的可调接收机的工作波长。如果服务提供商有多对上行波长和下行波长， ONU 可以根据所述上行波长或下行波长的带宽使用率等附加信息来选择上 行波长和下行波长， 如选择下行波长的带宽使用率最低的下行波长及对应的 上行波长作为 ONU 的工作波长， 或选择下行波长和上行波长的带宽使用率 均最低的下行波长和上行波长作为 ONU的工作波长。
另外， ONU在波长设置过程中， 可以不处理从 OLT接收到的其它消息。
ONU设置完工作波长， 设置内部存储器或寄存器中的特定标志位， 标记 ONU光模块的工作波长已设置，此时 ONU的状态又恢复到刚上电时的状态。 这里需要提醒的是， 当 ONU 进行波长设置后， 由于又恢复到刚上电时的状 态，所以此时 ONU还需要进一步通过判断该 ONU的工作波长是否已经设置。 可以通过特定标志位判断是否已经设置该工作波长， 若已经设置， 则继续执 行步骤 206即可， 若判断结果还没有设置， 则执行步骤 203-205。
206、 ONU执行 ONU注册流程。
如果在 ONU判断自身的工作波长已经设置，则所述 ONU通过设置的上 行波长， 响应 OLT, 并且忽略（或不处理） 下行消息中与波长分配相关的信 息， 完成 ONU注册过程。
可选的， OLT可以分多次向 ONU发送上述波长信息， 每次发送的波长 信息包括一部分服务提供商信息、 与服务提供商对应的上行波长及下行波长 信息、 可选的上行波长或下行波长的带宽使用率等附加信息， 也可以一次下 发所有的服务提供商、 与服务提供商对应的波长信息等。
进一步，如果 ONU没有在波长分配表中查找到与 ONU所属的服务提供 商信息对应的波长信息， 则回到步骤 201 , 选择另一个预存储的下行波长作 为 ONU的临时工作波长， 并重新开始前述波长分配过程。 若 ONU波长分配 失败超过一定的次数， 则给出故障指示信号， 由网络维护人员进一步处理。
207、 ONU根据设置的工作波长发送或者接收光信号。
本发明实施例提供一种光通信系统中的波长分配方法，通过预先在 ONU 上设置波长分配表； 根据 ONU 所在的服务提供商， 通过所述波长分配表， 获得与所述 ONU 所在的服务提供商对应的波长信息； 根据所述获得的与所 述 ONU 所在的服务提供商对应的波长信息， 发送或者接收光信号， 简化了 波长分配的流程， 提升了业务质量， 提高了用户的体验程度。
另外， 本发明实施例中， 波长信息还包括上行波长或下行波长的带宽使 用率， 可以用带宽使用率来分配同一服务提供商的不同波长， 使服务提供商 更合理的分配波长和带宽资源。
下面具体举例说明上述实施例 1和实施例 2的具体流程。
假设共有 4个服务提供商 SP1、 SP2、 SP3、 SP4向网络运营商分发波 长， 由于各地业务数额不同， 根据实际情况， SP1分配 λ ά1\ λ ιι1和 λ ά2\ λ u2两对波长， 下行波长 d1的带宽使用率为 B1 , 下行波长 d2的带宽使用 率为 B2; SP2 分配了一对波长 λ ά3\ λ ιι3, 下行波长 d3 的带宽使用率为 B3; SP3和 SP4共享了一对波长 λ (Μ\ λ ιι4, 下行波长 λ d4的带宽使用率分 别为 B43和 B44 (其中， λ di表示下行波长， λ ui表示上行波长， i表示下 行波长和上行波长的编号）。 考虑到有些服务提供商不提供带宽使用率， 则带 宽使用率默认等于 0, 此时不具有参考意义。
在本场景中 OLT向 ONU发送 PLOAM消息， 所述 PLOAM消息包括： 服务提供商信息、 与所述服务提供商对应的波长信息， 其中， 所述波长信息 包括： 与服务提供商对应的上行波长及下行波长， 可选的还可以包括上行波 长或下行波长的带宽使用率等附加信息， 其中服务提供商可以是通过服务提 供商的标识表示。 其对应的包含上述波长信息的 PLOAM消息如表 1所示。
Figure imgf000011_0001
3 0x14 Message type ID
"Profile_Extension"
4 SeqNo Unicast or broadcast PLOAM sequence number, as appropriate
5-6 SP-ID #0 服务提供商 SP#0的标识
7-8 Downstream 下行通道 #0的波长信息
wavelength #0
9-10 Upstream (下行通道 #0对应的）上行通道 #0 wavelength #0 的波长信息
11-12 BW_Usage#0 带宽使用率
13-28
29-30 SP-ID #3 服务提供商 SP#3的标识
31 -32 Downstream 下行通道 #3的波长信息
wavelength #3
33-34 Upstream (下行通道 #3对应的）上行通道 #3 wavelength #3 的波长信息
35-36 BW_Usage#3 带宽使用率
37-40 Padding 预留字段
41 -48 MIC 校验信息
表 1
如表 1所述， 所述 PLOAM消息中的 1-2字节为 ONU的标识 ID信息， 当 ONU-ID 为 0x03FF, 为 OLT 广播消息给所有 ONU , 也可以直接通过 ONU-ID发送消息给对应 ONU; 第 3字节的内容为 0x14, 表示消息的类型； 第 4字节为序列号， 表示 PLOAM序列号， 可以是单播下发也可以是通过广 播方式下发给各 ONU; 5-6字节的内容为 SP-I D #0 ,表示服务提供商为 SP0 , 7-8字节，表示下行波长的信息； 9-10字节表示上行波长的信息；字节 11-12, 表示上行波长或者下行波长的带宽使用率； 依次类推， 下面各个字节的分别 承载服务提供商为 SP2、 SP3等，以及与所述服务提供商对应的波长信息等； 37-40字节为预留字段； 41-48字节为校验信息位。上述各字节所表示的内容 不是唯一的表现方式， 可以根据字节进行调整， 且各个字节数也不是唯一的， 也可以根据内容进行调整。
若在 WDM/TDM混合 PON系统中新加入一个未注册 ONU, ONU所属 的服务提供商为服务提供商 SP3。 ONU 上电后在系统预存储的下行波长 λ d1、 d2、 d3、 λ d4中随机选择一个下行波长 λ d1 ,并将 λ d1设置为 ONU 的光模块的可调接收机的临时工作波长。
OLT会周期性执行 ONU 自动发现过程， 在所有下行波长上广播包含有 波长相关信息的下行消息， 已注册的 ONU将忽略此信息， 未注册的 ONU则 通过内部存储器或寄存器中的特定标志位判断光模块的工作波长是否已设 置。 例如， 未注册的 ONU1判断出自身的光模块的工作波长未设置。 ONU1 通过设置的临时工作波长接收下行 PLOAM消息， 所述 PLOAM消息包括： 服务提供商、 与服务提供商对应的波长信息。 ON U1将接收到的 PLOAM消 息中的服务提供商、与服务提供商对应的波长信息记录到设置的波长分配表， 该波长分配表如表 2所示：
Figure imgf000013_0001
表 2
根据表 2所示的内容， ONU1根据 OLT发送的 PLOAM消息， 将所述消 息中携带的服务提供商、 服务提供商对应的波长信息， 以及所述波长的带宽 使用率分别归类， 填入表 2中。 其中所述波长的带宽使用率为可选项， 上述 表 2中的各表项内容可以是 OLT—次下发给 ONU1 ,也可以是分多次下发给 ONU1。
ONU1根据所述预存储的服务提供商信息 SP3的标识，从所述波长分配 表中， 查找到与所述 SP3对应的波长信息， 选择下行波长 λ d4及上行波长 λ ιι4, 并设置为 ONU的工作波长， 即 ONU中光模块的可调发射机以及可调 接收机的工作波长， 其中， λ ιι4 为可调发射机的工作波长， d4 为可调接 收机的工作波长。
ONU1 设置完工作波长， 设置内部存储器或寄存器中的特定标志位， 标 记 ONU1的工作波长已设置， ONU1的状态又恢复到刚上电时的状态， 此时 可以通过所述的特定标志位判断出 ONU1 的工作波长已设置。 然后 ONU可 以在设置的上行波长上响应 OLT新发起的 ONU1 自动发现过程，此时忽略与 波长相关的信息， 继续进行 ONU1的注册过程（其 ONU1的注册过程为现有 流程， 这里就不再贅述）。
实施例 3:
本发明实施例提供了一种光网络单元 ONU, 如图 3所示， 所述 ONU包 括：
信息设置单元 31 , 用于预先在 ONU上设置波长分配表， 所述波长分配 表包括： 服务提供商信息、 与所述服务提供商对应的波长信息；
波长选择单元 32, 用于根据 ON U所在的服务提供商， 通过所述波长分 配表， 获得与所述 ONU 所在的服务提供商对应的波长信息； 并根据所述获 得的与所述 ONU所在的服务提供商对应的波长信息， 发送或者接收光信号。
进一步的， 如图 4所示， 所述 ONU还包括：
信息接收单元 33, 用于接收 OLT发送的第一消息， 所述第一消息包括： 服务提供商、 与服务提供商对应的波长信息， 其中所述第一消息为 PLOAM 消息、 或者 OMCI消息、 或者 SNMP消息。 所述信息设置单元 31 , 具体用于根据所述第一消息， 在所述光网络单元 上设置波长分配表， 具体所述波长分配表请参见表 2所示。
所述信息接收单元 33还用于预先从存储的下行波长中选择一个下行波 长， 设置为 ONU的临时工作波长， 根据所述临时工作波长接收 OLT下发的 第一消息。
可选的， 如图 4所示， 所述光网络单元还包括：
存储单元 34, 用来存储所述信息设置单元设置的波长分配表。 述服务提供商对应的上行波长， 以及与所述服务提供商对应的下行波长。 务提供商对应的上行波长的带宽使用率， 以及与所述服务提供商对应的下行 波长的带宽使用率。
所述波长选择单元， 具体用于根据所述 ONU 所在的服务提供商， 查找 所述波长分配表， 选择与所述 ONU 所在的服务提供商对应的波长上信息， 所述波长信息包括： 所述服务提供商对应的上行波长以及下行波长。 将所述 上行波长以及下行波长设置为所述 ONU 的工作波长， 通过该工作波长发送 或者接收光信号。
其中所述 ONU 包括： 光模块， 所述光模块包括： 可调发射机和可调接 收机， 其中与 ONU 所属的服务提供商对应的下行波长被设置为可调接收机 的工作波长， ONU通过所述设置的下行波长接收 OLT下发的光信号，与 ONU 所属的服务提供商对应的上行波长被设置为可调发送机的工作波长， 通过所 述上行波长发送光信号给 OLT。
进一步地， 如果服务提供商有多对上行波长和下行波长， ONU还可以根 据所述上行波长或下行消息的带宽使用率等附加信息来选择上行波长和下行 波长， 因此， 所述波长信息还可以包括：： 与所述服务提供商对应的上行波长 的带宽使用率， 以及与所述服务提供商对应的下行波长的带宽使用率。 例如 选择下行波长的带宽使用率最低的下行波长及对应的上行波长来作为 ONU 的工作波长 , 或选择下行波长和上行波长的带宽使用率均最低的下行波长和 上行波长作为 ONU的工作波长。
本发明实施例提供一种光网络单元， 通过信息设置单元预先在 ONU 上 设置波长分配表， 所述波长分配表包括： 服务提供商信息、 与所述服务提供 商对应的波长信息； 波长选择单元根据 ONU 所在的服务提供商， 通过所述 波长分配表， 获得与所述 ONU 所在的服务提供商对应的波长信息； 并根据 所述获得的与所述 ONU 所在的服务提供商对应的波长信息， 发送或者接收 光信号， 简化了波长分配的流程， 提升了业务质量， 提高了用户的体验程度 另外， 本发明实施例中， 波长相关信息还包括上行波长或下行波长的带 宽使用率， 可以用带宽使用率来分配同一服务提供商批发的多对波长， 使服 务提供商更合理的分配波长和带宽资源。
如图 5所示，本发明实施例还提供一种光网络系统，所述系统包括： ONU 和 OLT, 其中， 所述 ONU具体包括：
信息设置单元， 用于预先在 ONU 上设置波长分配表， 所述波长分配表 包括： 服务提供商信息、 与所述服务提供商对应的波长信息；
波长选择单元， 用于根据 ONU 所在的服务提供商， 通过所述波长分配 表， 获得与所述 ONU 所在的服务提供商对应的波长信息； 并根据所述获得 的与所述 ONU所在的服务提供商对应的波长信息， 发送或者接收光信号。
所述 OLT, 用于发送第一消息给 ONU; 接收 ONU返回的响应消息后， 完成 ONU的注册过程。
具体的，请参见图 5所示的光网络系统，在 OLT—侧有 SP1~SP4共 4个 服务提供商， 网络运营商将根据各个服务提供商的运营状况给其分发波长， OLT存储有服务提供商信息及与所述服务提供商对应的波长信息， OLT会定 时的将所述第一消息加载在系统内的所有下行波长上作为下行消息通过 Tx1~Tx4 四个发射器发送出去， 这些下行波长经过波长复用器和波分复用 ( wavelength division multiplexing , WDM )耦合器以 WDM的方式共存， 在传输到用户侧时，通过光功率分路器将所述第一消息广播给 ONU1~ONU4。 以 ONU1为例， 如果 ONU1 已注册， 则忽略所述第一消息； 如果 ONU1未注 册， 则 ONU1 随机选择一个临时工作波长， 通过该临时工作波长接收 OLT的 Tx1 发送的第一消息， 并根据上述的波长分配方法为 ONU1 的光模块设置工 作波长， 并开始执行 ONU1 注册流程， ONU1 注册后可以与 OLT通过已经设 置的工作波长进行通信。 ONU1 将上行光信号加载在上行波长上通过可调发 射机 ΤχΑ向 OLT发送出去， 进入 OLT后经过 WDM耦合器和波长解复用器由 OLT的 4 个接收机 RxA~RxD任意一个接收机接收。 ONU2~ONU4 可参考 ONU1的操作。 本发明实施例提供一种光网络系统， 通过在 ONU上设置波长 分配表；根据 ONU所在的服务提供商，通过所述波长分配表，获得与所述 ONU 所在的服务提供商对应的波长信息； 根据所述获得的与所述 ON U所在的服务 提供商对应的波长信息， 发送或者接收光信号， 简化了波长分配的流程， 提 升了业务质量， 提高了用户的体验程度。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读 取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述 的存储介质包括： ROM、 RAM , 磁碟或者光盘等各种可以存储程序代码的介 最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其 限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术 人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修改， 或 者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要求 书
1、 一种光通信系统中的波长分配方法， 其特征在于， 包括： 预先在光网络单元上设置波长分配表， 所述波长分配表包括： 服务提 供商信息、 与所述服务提供商对应的波长信息；
根据光网络单元所在的服务提供商， 通过所述波长分配表， 获得与所 述光网络单元所在的服务提供商对应的波长信息； 根据所述获得的与所述光网络单元所在的服务提供商对应的波长信 息， 发送或者接收光信号。
2、 根据权利要求 1所述的波长分配方法， 其特征在于， 所述预先在光 网络单元上设置波长分配表之前还包括： 接收光线路终端发送的第一消息， 所述第一消息包括： 服务提供商、 与服务提供商对应的波长信息， 其中所述第一消息为物理层运行与维护消 息、或者光网络单元管理和控制接口协议消息、或者简单网络管理协议消息； 所述预先在光网络单元上设置波长分配表具体为：
根据所述第一消息， 在光网络单元上设置波长分配表。
3、 根据权利要求 2所述的波长分配方法， 其特征在于， 所述方法还包 括： 存储所述波长分配表。
4、 根据权利要求 1-3任意一项所述的波长分配方法， 其特征在于， 所 述波长分配表中与所述服务提供商对应的波长信息包括：与所述服务提供商
所述获得与所述光网络单元所在的服务提供商对应的波长信息包括：
网络单元所在的服务提供商对应的下行波长。
5、 根据权利要求 4任意一项所述的波长分配方法， 其特征在于， 所述 波长分配表中与所述服务提供商对应的波长信息还包括：与所述服务提供商 对应的上行波长的带宽使用率，以及与所述服务提供商对应的下行波长的带 宽使用率。
6、 根据权利要求 4所述的波长分配方法， 其特征在于， 所述根据所述 获得的与所述光网络单元所在的服务提供商对应的波长信息，发送或者接收 光信号包括：
置为所述光网络单元的工作波长，通过所述光网络单元的工作波长，发送或 者接收光信号。
7、 一种光网络单元， 其特征在于， 包括： 信息设置单元， 用于预先在光网络单元上设置波长分配表， 所述波长 分配表包括： 服务提供商信息、 与所述服务提供商对应的波长信息； 波长选择单元， 用于根据光网络单元所在的服务提供商， 通过所述波 长分配表，获得与所述光网络单元所在的服务提供商对应的波长信息； 并根 据所述获得的与所述光网络单元所在的服务提供商对应的波长信息 ,发送或 者接收光信号。
8、 根据权利要求 7所述的光网络单元， 其特征在于， 所述光网络单元 还包括：
信息接收单元，用于接收光线路终端发送的第一消息，所述第一消息包 括： 服务提供商、 与服务提供商对应的波长信息， 其中所述第一消息为物理 层运行与维护消息、或者光网络单元管理和控制接口协议消息、或者简单网 络管理协议消息； 所述信息设置单元， 具体用于根据所述第一消息， 在所述光网络单元 上设置波长分配表。
9、 根据权利要求 8所述的光网络单元， 其特征在于， 所述光网络单元 还包括： 存储单元， 用来存储所述信息设置单元设置的波长分配表。
10、 根据权利要求 7-9任意一项所述的光网络单元， 其特征在于， 所 述波长分配表中与所述服务提供商对应的波长信息包括：与所述服务提供商
11、 根据权利要求 10任意一项所述的光网络单元， 其特征在于， 所述 波长分配表中与所述服务提供商对应的波长信息还包括：与所述服务提供商 对应的上行波长的带宽使用率或所述服务提供商对应的下行波长的带宽使 用率。
12、 一种光网络系统， 其特征在于， 所述光网络系统包括： 光线路终 端和至少一个如权利要求 7-11所述的光网络单元。
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