WO2020063685A1 - Système de réseau optique, olt, procédé de transmission de signal et support d'informations lisible - Google Patents

Système de réseau optique, olt, procédé de transmission de signal et support d'informations lisible Download PDF

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Publication number
WO2020063685A1
WO2020063685A1 PCT/CN2019/107927 CN2019107927W WO2020063685A1 WO 2020063685 A1 WO2020063685 A1 WO 2020063685A1 CN 2019107927 W CN2019107927 W CN 2019107927W WO 2020063685 A1 WO2020063685 A1 WO 2020063685A1
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Prior art keywords
olt
optical
network system
module
receivers
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PCT/CN2019/107927
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English (en)
Chinese (zh)
Inventor
杨巍
杨波
黄新刚
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0037—Operation
    • H04Q2011/0049—Crosstalk reduction; Noise; Power budget
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects

Definitions

  • the embodiments of the present disclosure relate to, but are not limited to, the field of optical communication, and in particular, to an optical network system, an OLT, a signal transmission method, and a readable storage medium.
  • An embodiment of the present disclosure provides an optical network system including an optical line terminal (OLT) component, a main optical splitter, and at least two optical network units (ONUs).
  • the main beam splitter is an M: N type beam splitter, and M and N are both greater than or equal to two.
  • the M end of the main optical splitter is connected to the OLT component, and the N end is connected to the ONU.
  • the OLT component receives the uplink signals forwarded by the main optical splitter through M receivers, and superimposes the uplink signals received by at least two receivers.
  • An embodiment of the present disclosure further provides an OLT, which includes at least one receiver, and the OLT receives uplink signals received and superimposed by at least two receivers.
  • the uplink signal is forwarded by the main optical splitter.
  • the main optical splitter is an M: N type optical splitter, and M and N are both greater than or equal to 2, the M end is connected to the receiver, and the N end is connected to the ONU.
  • An embodiment of the present disclosure further provides a signal transmission method, which is applied to an optical network system according to the present disclosure.
  • the signal transmission method includes: the ONU generates an uplink signal; and after the uplink signal passes through the main optical splitter, it is divided into M channels and sent to the receiver of the OLT in the OLT component, and the uplink received by at least two receivers The signals are superimposed.
  • An embodiment of the present disclosure further provides a computer storage medium on which one or more programs are stored, and the one or more programs can be executed by one or more processors to implement the steps of the signal transmission method according to the present disclosure. .
  • FIG. 1 is a schematic diagram of an optical splitter in the related art
  • FIG. 2 is a schematic structural diagram of an optical network system according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a composition of an optical network system according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a composition of a synchronous addition module according to an embodiment of the present disclosure
  • FIG. 6 is a schematic composition diagram of an optical network system according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic composition diagram of an optical network system according to an embodiment of the present disclosure.
  • FIG. 8 is a flowchart of a signal transmission method according to an embodiment of the present disclosure.
  • the optical power will be reduced to 1 / N, that is, the optical power will be reduced by 10log (N) dB, Energy is wasted.
  • N 10log
  • the optical network system in this embodiment includes: an OLT component 21, a main optical splitter 22, and at least two ONUs 23.
  • the main beam splitter 22 is an M: N type beam splitter, and M and N are both greater than or equal to two.
  • the M end of the main optical splitter 22 is connected to the OLT component 21, and the N end is connected to the ONU 23.
  • the OLT component 21 receives the uplink signals forwarded by the main optical splitter 22 through M receivers, and superimposes the uplink signals received by at least two receivers.
  • the optical splitter also called an optical splitter, is one of the important passive components in an optical fiber link, and is an optical fiber tandem device with multiple input ends and multiple output ends.
  • Optical splitters can be divided into two types: fused pull-cone type and planar waveguide type (PLC type) according to the principle of optical splitting.
  • the main technical parameters of the optical splitter include loss, splitting ratio, and isolation.
  • the insertion loss of the optical splitter refers to the dB (decibel) number of each output relative to the input optical loss.
  • Ai -10lgPouti / Pin, where Ai refers to the insertion loss of the i-th output port, and Pouti Is the optical power of the i-th output port, and Pin is the optical power value of the input end.
  • the split ratio is defined as the output power ratio of the output ports of the splitter. In the system application, the appropriate splitting ratio can be determined according to the optical power required by the actual system optical node, or it can be directly distributed evenly.
  • the splitting ratio of the beam splitter is related to the wavelength of the transmitted light. Isolation refers to the ability of an optical path of an optical splitter to isolate optical signals in other optical paths.
  • the type of the main beam splitter 22 used is an M: N type, where M and N are both greater than or equal to two.
  • the main optical splitter 22 includes two ends of M and N.
  • the M terminal has M interfaces and the N terminal has N interfaces.
  • the M terminal is located on the OLT side and is connected to the OLT component 21; the N terminal is located on the ONU 23 side and connected to the ONU 23.
  • the uplink signal is sent from the ONU 23 in the form of an optical signal, and is sent to the M end through the N end of the main optical splitter 22.
  • the M interfaces at the M end are connected to the M receivers in the OLT component 21, that is, the main optical splitter 22 divides the M uplink signals into M ports, and then transmits them to the receiver in the OLT component 21.
  • the M terminal has at least two interfaces. Compared with the case where there is only one port in the related technology, one light is changed to at least two lights, thereby theoretically increasing the uplink power to at least twice. That is, the uplink power budget is increased by at least 3 dB.
  • M and N may be equal. That is, the main optical splitter 22 may be an N: N optical splitter, and the number of optical paths of the two ports of M and N is the same.
  • N: N can be 2: 2, or 4: 4, 8: 8, and so on.
  • the number of ONUs 23 is often more than one.
  • the optical network system may further include a slave optical splitter. At least one port on the N end of the main optical splitter 22 and the ONU 23 can be connected through the secondary optical splitter. That is, the ONU 23 and the master optical splitter 22 can be connected through the slave optical splitter.
  • the number of slave beam splitters and the type of slave beam splitters are not limited.
  • the type of the secondary beam splitter may be an X: Y type, where X and Y are both greater than or equal to 1. Referring to FIG. 3, FIG.
  • FIG. 3 shows a schematic composition diagram of an optical network system having a slave optical splitter in this embodiment, and the slave optical splitter shown is a 1: N optical splitter.
  • the slave optical splitter shown is a 1: N optical splitter.
  • the OLT component 21 includes at least one OLT, and at least one receiver is disposed in the at least one OLT.
  • the uplink signals received by the two receivers are combined in the OLT.
  • the power of the uplink signal it receives is twice as much as if it were received by only one receiver.
  • the uplink signals are received through two receivers. There may be synchronization problems between different uplink signals. This is because different optical fibers are connected from the main optical splitter 22 to the OLT. The distance between different optical fibers and the OLT may be different. This difference results in a possible time difference between the uplink signals received by the two OLT receivers.
  • the OLT component 21 further includes a synchronous addition module 30.
  • the synchronous addition module 30 When superimposing the uplink signals received by at least two receivers, the synchronous addition module 30 is connected to a receiver corresponding to the uplink signals to be superimposed. To receive the uplink signal transmitted by the receiver and perform synchronous superposition. For the case where synchronous superposition is required, it may include a case where each receiver is located in one OLT, and a case where one receiver is located in one OLT, and other receivers are located outside the OLT and superimpose uplink signals.
  • the synchronous addition module 30 includes a buffer 31 that matches the number of receivers, a delay calculation module 32, an adjustable delay module 33, and an analog addition module 34.
  • the buffer 31 receives an uplink signal transmitted by each receiver and buffers it.
  • the delay calculation module 32 performs delay calculation according to each uplink signal buffered in the buffer 31, and controls the time for the adjustable delay module 33 to align with each uplink signal based on the delay calculation result. After the time of each uplink signal is aligned, the uplink signal is superimposed by the analog addition module 34.
  • FIG. 4 shows a schematic composition structure of the synchronous addition module 30 in this embodiment.
  • the distance between different optical fibers and the OLT may be slightly different, which may cause a time difference in the electrical signals received by the receivers of the OLT. If these two electrical signals are directly added, errors may result. Therefore, the two electrical signals need to be processed synchronously to delay one of the signals appropriately to ensure that the two signals are aligned in time before adding.
  • the two analog electrical signals received by the receiver are first buffered by two buffers 31, and then the time difference between the two signals in the two buffers 31 is calculated by the delay calculation module 32.
  • the delay calculation module 32 may obtain the time difference by calculating a cross-correlation of the two signals.
  • the two analog electrical signals are aligned in time by adjusting the delay of the adjustable delay module 33.
  • the process of adjusting the delay can be implemented during the registration process of the ONU 23. In general, once the delay is determined that no special circumstances occur, there is no need to change the delay. After the delay adjustment is completed, the two analog electric signals are added to the OLT line card after being added by the analog addition module 34.
  • the OLT can detect the bit error condition of the uplink signal in real time. If the bit error rate is too high, the ONU 23 is disconnected and the registration process is restarted. The OLT can send a signal to cause the synchronous addition module 30 to recalculate the delay situation, and update the delay of the adjustable delay module 33 to align the two signals again.
  • the OLT component 21 may include at least two OLTs.
  • the OLT component 21 includes at least two OLTs, at least one OLT is a master OLT, and at least one OLT different from the master OLT is a standby OLT.
  • the standby OLT takes over the work of the master OLT.
  • one of the OLTs may be a normal working OLT, that is, the main OLT, and the other OLT may be a standby OLT of the normal working OLT.
  • a signal connection may exist between the two OLTs, so that the configuration information and registration information between the two OLTs are consistent.
  • the configuration of the primary OLT and the standby OLT and the ONU registration information can be completely the same.
  • the standby OLT can copy the configuration of the primary OLT and the ONU registration information when the primary OLT is working.
  • the primary OLT and the standby OLT are not fixed configuration methods.
  • the lower active OLT can also be used as the standby OLT, and the standby OLT can also be used as the active OLT, that is, two OLTs can be active and standby each other.
  • This embodiment provides an optical network system including an optical line terminal OLT component, a main optical splitter, and at least two optical network units ONUs.
  • the main beam splitter is an M: N-type beam splitter, and M and N are both greater than or equal to two.
  • the M end of the main optical splitter is connected to the OLT component, and the N end is connected to the ONU.
  • the OLT component receives the uplink signal forwarded by the main optical splitter through M receivers.
  • the M: N type main optical splitter effectively avoids the power loss of the uplink signal, significantly improves the uplink power budget, and provides a wider range of application space for the optical network system.
  • the ODN main optical splitter is a 2: 2 optical splitter, and ports 1 and 2 are respectively connected to two receivers of one optical module of the OLT.
  • the two receivers convert the two optical signals into two electric signals, and the two electric signals are synchronized and added inside the optical module, and then transmitted upward.
  • ONU1, ONU2, ONUn, ONUn + 1, ONUn + 2, ONU2n identify different ONUs.
  • two receivers PD1 and PD2 are provided in the OLT module (OLT optical module).
  • the transmitter DFB shares a fiber port with the receiver PD1 through a multiplexer and demultiplexer, and the receiver PD2 uses another fiber port. These two optical ports are connected to port 1 and port 2 of the 2: 2 splitter, respectively.
  • the optical signal transmitted by the transmitter DFB enters the main optical splitter at 2: 2 through port 1, and then the optical signal is transmitted equally down through port 3 and port 4, and then reaches each ONU through the optical splitter and fiber.
  • the figure shows the use of two 1: N splitters. The actual situation is not limited to this. More than two slave splitters and / or multi-stage slave splitters can be used.
  • the ONU transmits an upstream burst signal, passes through the optical fiber and each slave splitter, and then reaches the master splitter, for example, it reaches port 4 of the master splitter, and then splits out from ports 1 and 2 to enter the OLT optical module.
  • the OLT optical module does not include port 2 and receiver PD2, so half of the upstream optical power is wasted.
  • the technical solution of the present disclosure uses the receivers PD1 and PD2 to receive two optical signals at the same time, and converts them into analog electric signals. The two electrical signals are added on the electrical domain after synchronization (for example, an analog electrical adder can be used), and the analog electrical signals are converted into digital electrical signals after the addition, and uploaded to the OLT line card. In this way, the uplink received optical signal power can be doubled, that is, the uplink power budget is increased by 3dB.
  • the main optical splitter uses a 2: 2 optical splitter, port 1 is connected to an OLT component (OLT optical module), and port 2 is connected to a dedicated receiver PD2 on the OLT line card.
  • OLT optical module OLT component
  • receiver PD2 OLT line card
  • the analog signal converted by the receiver PD2 and the analog electric signal converted by the receiver PD1 are synchronized and added, and then converted into a digital electric signal and transmitted to the OLT line card.
  • the ONU transmits an upstream burst signal, passes through the optical fiber and each slave splitter, and then reaches the master splitter, for example, it reaches port 4 of the master splitter, and then splits out from ports 1 and 2 to enter the OLT optical module and Dedicated receiver PD2 for OLT line cards.
  • the receiver PD2 receives the optical signal and converts it into an analog electrical signal, and inputs the analog electrical signal to the OLT optical module.
  • the receiver PD1 receives the optical signal and converts it into an analog electrical signal, synchronizes and adds the analog electrical signal with the analog electrical signal from PD2, and then converts the digital electrical signal to the OLT line card and uploads it.
  • the uplink received optical signal power can be doubled, that is, the uplink power budget is increased by 3dB.
  • the OLT includes at least one receiver, and the OLT receives the uplink signals received by the at least two receivers, and superimposes the uplink signals.
  • the uplink signal is forwarded by the main optical splitter, which is an M: N type optical splitter, and M and N are both greater than or equal to 2.
  • the M end of the main optical splitter is connected to each receiver, and the N end is connected to the ONU.
  • the OLT includes at least one receiver.
  • the OLT includes two receivers.
  • the OLT includes one receiver, and the other receivers may be receivers on the OLT line card. , Or a receiver on another OLT. That is, for an OLT, among at least two receivers corresponding to the uplink signals received by the OLT, at least one receiver is set in the OLT, and the other receivers may be receivers set in the OLT.
  • a receiver outside the OLT can be provided.
  • the OLT may include a synchronous addition module 30.
  • the uplink signals transmitted by the at least two receivers are received by the synchronous addition module 30 and superimposed, and the synchronous addition module 30 is connected to the at least two receivers.
  • the synchronous addition module 30 includes a buffer 31 that matches the number of receivers, a delay calculation module 32, an adjustable delay module 33, and an analog addition module 34.
  • the buffer 31 receives an uplink signal transmitted by each receiver and buffers it.
  • the delay calculation module 32 performs delay calculation according to each uplink signal buffered in the buffer 31, and controls the time for the adjustable delay module 33 to align with each uplink signal based on the delay calculation result. After the time of each uplink signal is aligned, the uplink signal is superimposed by the analog addition module 34.
  • the ODN main optical splitter is a 2: 2 optical splitter.
  • Port 1 is connected to OLT1, and port 2 is connected to OLT2.
  • OLT1 is the primary OLT, and OLT2 is the standby OLT.
  • OLT1 When OLT1 is the main OLT and OLT2 is the standby OLT, OLT1 works and OLT2 is on standby.
  • the downlink signal enters the main optical splitter through port 1, and then the optical signal is transmitted equally down through port 3 and port 4, and reaches each ONU through the slave optical splitter and fiber.
  • the figure shows the use of two 1: N splitters. The actual situation is not limited to this. More than two slave splitters and / or multi-stage slave splitters can be used.
  • OLT1 fails and cannot work normally, OLT1 sends a signal to OLT2, OLT2 starts to take over OLT1, restarts the registration process and updates the ONU registration information (for example, ONU distance, etc.).
  • OLT1 and OLT2 can be swapped, that is, OLT1 and OLT2 can be active and standby for each other.
  • the main optical splitter in this embodiment is not limited to using a 2: 2 optical splitter, and an N: N optical splitter may also be used.
  • more than one OLT may be used as a backup, and this embodiment may be performed in the same manner as in the second or third embodiment. combination.
  • N: N splitter When N: N splitter is used, multiple OLTs can also connect multiple optical fibers.
  • step S801 the ONU generates an uplink signal.
  • step S802 after the uplink signal passes through the main optical splitter, it is divided into M channels and sent to the receiver of the OLT in the OLT component, and the uplink signals received by at least two receivers are superimposed.
  • optical network system applied in this embodiment is as described in the foregoing embodiments, and is not repeated here.
  • This embodiment provides a computer-readable storage medium including the method implemented in any method or technology for storing information such as computer-readable instructions, data structures, computer program modules, or other data. Volatile or non-volatile, removable or non-removable media.
  • Computer-readable storage media include, but are not limited to, RAM (Random Access Memory), ROM (Read-Only Memory, Read-Only Memory), EEPROM (Electrically Erasable, Programmable, Read-Only Memory, and Erasable Programmable Read-Only Memory) ), Flash memory or other memory technology, CD-ROM (Compact Disc Read-Only Memory), digital versatile disk (DVD) or other optical disk storage, magnetic box, magnetic tape, disk storage or other magnetic storage devices, Or any other medium that can be used to store desired information and can be accessed by a computer.
  • the computer-readable storage medium in this embodiment may store one or more computer programs, and the stored one or more computer programs may be executed by a processor to implement the steps of the signal transmission method in the foregoing embodiments.
  • This embodiment also provides a computer program (or computer software), which can be distributed on a computer-readable medium and executed by a computable device to implement the steps of the signal transmission method in the foregoing embodiments. In some cases, the steps shown or described may be performed in an order different from that described in the above embodiments.
  • This embodiment also provides a computer program product including a computer-readable device, where the computer-readable device stores the computer program as shown above.
  • the computer-readable device in this embodiment may include a computer-readable storage medium as shown above.

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  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
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Abstract

L'invention concerne un système de réseau optique, un terminal de ligne optique, un procédé de transmission de signal et un support d'informations lisible. Le système de réseau optique comprend un module de terminal de ligne optique, un diviseur optique principal et au moins deux unités de réseau optique ; le diviseur optique principal est un diviseur optique de type M:N, et M et N sont tous les deux supérieurs ou égaux à 2 ; l'extrémité M du diviseur optique principal est connectée au module de terminal de ligne optique, et l'extrémité N du diviseur optique principal est connectée au système de réseau optique ; et le module de terminal de ligne optique reçoit par l'intermédiaire de M récepteurs des signaux de liaison montante transmis par le diviseur optique principal, et superpose des signaux de liaison montante reçus par au moins deux récepteurs.
PCT/CN2019/107927 2018-09-25 2019-09-25 Système de réseau optique, olt, procédé de transmission de signal et support d'informations lisible Ceased WO2020063685A1 (fr)

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