CN201733410U - Optical cross connecting device for optical burst switching network core node - Google Patents

Abstract

An optical cross-connect device for the core node of the optical burst switching network, including a service source module, the service source module is connected to the control module through the BCP channel, and the service source module is connected to the optical cross-connect module through the optical transmission module; the optical cross-connect module Controlled by the control module; the optical cross-connect module is provided with a first demultiplexer, a first multiplexer, and the first demultiplexer is connected to the first multiplexer through a channel unit; the channel unit is connected with the BDP data The transmission channel is composed of one-to-one wavelength correspondence; the control module includes an identification unit and an analysis unit; in the optical cross-connect module, the wavelength conversion unit, one of the output terminals of the channel unit is connected to the input terminal of the wavelength conversion unit, and the output terminal of the wavelength conversion unit is connected to the input terminal of the wavelength conversion unit. One of the output ends of the channel unit is connected; the analysis unit is respectively connected to the channel unit and the wavelength conversion unit. The utility model has the advantages of strong anti-congestion ability, simple structure and low cost.

Description

Optical cross-connect device for core node of optical burst switching network

technical field

The utility model belongs to the field of optical burst switching (Optical Burst Switching, OBS) network, especially the core node structure in the OBS network. Specifically, it relates to an optical cross connection (Optical Cross Connection, OXC) structure used in a core node of an OBS network and a control method for the OXC.

technical background

With the maturity of Dense Wavelength Division Multiplexing (DWDM) technology, the capacity of communication network is getting bigger and bigger. At present, a single optical fiber can carry dozens or even hundreds of transmission channels, and the transmission capacity of each transmission channel can reach 40Gbps or even higher. Although the transmission capacity of the communication network has been able to meet the needs of various services, it also brings pressure on the development of the switching system. At present, the switching capacity of network nodes is insufficient, which has become a bottleneck restricting the development of the current network. In order to increase switching capacity and reduce switching costs, it is imperative to develop optical switching technology. There are three main optical switching technologies: Optical Circuit Switching (OCS), Optical Packet Switching (OPS) and Optical Burst Switching (OBS). The bandwidth granularity used by OBS is between OCS and OPS. Compared with OCS, OBS has a higher bandwidth utilization rate; compared with OPS, OBS has lower requirements for optical devices. It can be said that OBS combines the advantages of the two and overcomes some of the shortcomings of the two. It is a balanced choice between the two. Therefore, OBS is one of the most potential switching technologies in the next generation network. In recent years, OBS technology has become a research hotspot in the field of optical communication.

The OBS network consists of edge nodes and core nodes. Among them, the core node is mainly responsible for routing and switching functions. The optical cross-connect (OXC) system is a key part of the OBS core node, and its performance directly determines the performance of the OBS core node, and even the performance of the entire OBS network. Therefore, designing an OXC system with excellent performance and reliable operation as the core node is of great significance for the practical application of the OBS network.

According to the strength of the OXC wavelength conversion capability, the OXC structure can be divided into two types: Figure 1 shows an OXC that cannot convert the input wavelength, that is, does not have the wavelength conversion capability, and is called a wavelength selective cross-connector (WSXC) . For example, mentioned in the literature (S.Okamoto, A.Watanabe, K.-I.Sato, Optical path cross-connect node architectures for photonic transport network, Journal of Lightwave Technology, vol.14, issue 6, pp1410-1422, 1996) The OXC is WSXC. It has p input/output links, and n wavelengths are transmitted in each link. The utility model assumes that p is 3 and n is 4. The WSXC in Fig. 1 is a simple WSXC type OXC composed of a demultiplexer, a 3×3 optical switch and a multiplexer. A group of wavelengths transmitted by wavelength division multiplexing in each link is demultiplexed by a demultiplexer, and then the channels of the same wavelength form a group and enter the optical switch of the corresponding wavelength, and the corresponding optical switch Execute the swap function. Although WSXC provides a powerful switching connection function, congestion occurs when a new connection request needs to occupy an already connected busy channel.

Figure 2 shows an OXC with wavelength conversion (Wavelength Conversion, WC) capability, called a wavelength internal variable cross-connector (WIXC), WIXC can switch any transmission channel of any input fiber to any output fiber An arbitrary transmission channel of . For example, the OXC mentioned in the literature (E.Karasan, E.Ayanoglu, Performance of WDM transport networks, IEEE Journal on Selected Areas in Communications, vol.16, issue 7, pp1081-1096, 1998) is WIXC, which has p inputs /Output link, each link transmits n wavelengths. The utility model assumes that p is 3 and n is 4. The WIXC in the figure is composed of a demultiplexer, an optical switch matrix, a wavelength converter and a multiplexer. The optical switch matrix can switch any wavelength signal in the input link to any output link. Each wavelength converter is capable of converting an input wavelength to any other wavelength. Therefore, in WIXC, if a new signal connection conflicts with an established signal connection, it can convert the conflicting wavelength into other idle wavelengths. Obviously, compared with WSXC, WIXC has a stronger ability to deal with congestion. Congestion will only occur if all wavelengths in the output fiber are occupied.

WIXC is mainly aimed at backbone network applications, and bearer services are generally STM-16/OC-48 or STM-64/OC-192 or even STM-256/OC-768. O/E/O wavelength converters are used in the nodes to achieve large-capacity, long-distance transmission. The crossover matrix can be completed by optical crossover or electrical crossover. The advantage of WIXC is that it can realize strictly non-blocking wavelength exchange, realize wavelength reuse, and provide virtual wavelength routing (VWP). The disadvantage is that the system has poor transparency and is expensive due to the extensive use of O/E/O wavelength converters. WSXC is mainly aimed at local network or metropolitan area network applications. O/E/O wavelength converters are generally not used or partially used in the node to be compatible with multi-rate and multi-service. The optical cross matrix in the node can be composed of several smaller-scale optical switches. The advantage is that the price is low, and the disadvantage is that the wavelength exchange capability is poor, and it is difficult to realize wavelength reuse.

Contents of the invention

In order to overcome the disadvantages of WSXC that is prone to congestion in the prior art, poor system transparency and high price of WIXC, the utility model provides a core node for optical burst switching network with strong anti-congestion ability, simple structure and low cost. optical cross-connect device.

The optical cross-connect device used for the core node of the optical burst switching network includes a service source module capable of cyclically and sequentially generating BCP and its corresponding BDP, the service source module is connected to the control module through the BCP channel, and the The service source module is connected to the optical cross-connect module through the optical transmission module. The optical transmission module is provided with a plurality of input optical fibers connected to the input end of the optical cross-connect module. The output optical fiber is connected to the optical receiving module; the optical cross-connect module is controlled by the control module;

The optical cross-connect module is provided with a first demultiplexer corresponding to the input optical fiber one-to-one, demultiplexing the BDP into BDP data with differences in multiple wavelengths, corresponding to the output optical fiber one-to-one, and demultiplexing the multiple wavelengths Differential BDP data is multiplexed as the first multiplexer of the target data packet, and the first demultiplexer is connected with the first multiplexer through the channel unit; the channel unit is connected with the BDP data One-to-one correspondence of the wavelength of the transmission channel composition;

It is characterized in that: the control module includes an identification unit connected to the BCP channel, capable of judging whether transmission congestion occurs with its corresponding BDP according to the current BCP, connected with the optical cross-connect module, searching for an idle transmission channel and obtaining Analysis unit for idle channel wavelengths;

The optical cross-connect module is provided with a wavelength conversion unit that converts the wavelength of the congested BDP into an idle channel wavelength, one of the output ends of the channel unit is connected to the input end of the wavelength conversion unit, and the The output end of the wavelength conversion unit is connected to one of the input ends of the channel unit;

The analysis unit is respectively connected with the channel unit and the wavelength conversion unit.

Further, the BCP includes the type information of the control packet, and the corresponding BDP priority, data type, optical wavelength number, source address, destination address, BDP packet length, offset time and check digit; Described BDP is made up of a plurality of Ethernet data packets, and described BDP is made up of protection field, synchronization field, burst packet length, grouping number, grouping length, IP grouping, data padding, check field, protection field; The aforementioned BCP is generated earlier than the aforementioned BDP by an offset time.

Further, the transmission channel is a first optical switch capable of connecting a specified input port with a required output port; the wavelength conversion unit includes an input port connected to an output port of the first optical switch respectively The second optical switch, and the wavelength converter whose output ends are respectively connected to the input ends of the first optical switch, and the output ends of the second optical switch correspond to the wavelength converters one by one.

Further, the optical transmitting module includes an optical transmitter and a second multiplexer based on DFB, which can convert the input electrical signal into an optical signal and emit it; It is composed of an optical receiver and a second demultiplexer for generating electrical signals.

Further, the optical transmitter and the second multiplexer of the optical transmission module are divided into three groups to form transmission units, and each transmission unit is demultiplexed with a first demultiplexer in the optical cross-connect module through an output optical fiber. The optical receiver and the second demultiplexer of the optical receiving module are divided into three groups to form receiving units, and each receiving unit is connected to a first multiplexer in the optical cross-connect module through an input optical fiber each optical fiber has 4 data wavelength channels; the optical cross-connect module is provided with 4 first optical switches and 1 second optical switch, and the optical switches are all 4×4 optical switches , the wavelength converter is a single wavelength converter.

Further, the described service source module uses the Poisson model to describe the traffic model of the data network, and satisfies the following basic assumptions:

(1) The time interval of traffic generated by external data sources is exponentially distributed, that is, the arrival process of data sources is a Poisson process, let {G(i)|i=1, 2, ..., N}, G(i) is the data packet The interval between i and i+1;

(2) The length of the traffic generated by the data source at one time obeys the exponential distribution, let {H(i)|i=1, 2, ..., N}, H(i) is the data length of the data packet i;

(3) G(i) and H(i) are independent of each other.

Further, the transmission control protocol of the service source module is the JET (Just EnoughTime) protocol, and the JET protocol uses a delayed reservation (Delayed Reservation) mode to reserve bandwidth, that is, each intermediate node according to the BDP length information contained in the BCP and offset time information to automatically complete the selection of wavelength channels, the reservation and release of bandwidth resources, and the establishment and removal of cross-connections; the BDP can be sent after waiting for an offset time (OffsetTime).

Both the BCP and the BDP generated by the service source module are electrical signals.

The optical cross connection method of the present utility model comprises the following steps:

1. The business source module cyclically generates the burst control packet BCP and the burst data packet BDP corresponding to the BCP and carrying valid information. The BCP includes the type information of the control packet and the priority of the corresponding BDP Level, data type, optical wavelength number, source address, destination address, BDP packet length, offset time and check digit; the optical wavelength number of the BDP represents the transmission channel for transmitting the data packet; the BCP is sent through the BCP channel To the control module, the BDP is transmitted to the optical cross-connect module by dividing the BDP into a plurality of input optical fibers through the optical transmission module, and the BDP is a wavelength division multiplexing signal;

2. The optical cross-connect module demultiplexes the BDP in each input optical fiber into multiple BDP data, the wavelength of the BDP data is different, and the BDP data of the same wavelength are transmitted to the same first optical switch;

3. The control module initializes the path state and command value list of each optical switch, so that the designated input end of each first optical switch is connected with the required output end to form a transmission channel, thereby establishing a cross connection;

4. The control module accepts the BCP from the service source module, and selects the corresponding first optical switch as the current optical switch according to the current optical wavelength signal of the BDP corresponding to the BCP;

5. Determine whether the current optical switch has established a cross-connection. If the current optical switch has not established a connection, then search the command value list of the optical switch, establish a cross-connection, and set the duration of the current optical switch cross-connection; If the connection is established, it is judged whether the current channel is idle. If the channel is idle, it is considered that there is no need to perform wavelength conversion on the corresponding BDP data. If the current channel is busy, it is considered that the corresponding BDP data needs to be converted on wavelength;

6. If wavelength conversion is required, determine whether the corresponding BDP data can perform wavelength conversion. If the BDP data can perform wavelength conversion, then search for an idle transmission channel optical switch, use the wavelength of the idle channel as the target wavelength, and use the wavelength of the idle channel as the target wavelength. The optical switch corresponding to the idle channel is the current optical switch, and the BDP is converted from the original wavelength to the destination wavelength and sent to the current optical switch; if the BDP cannot perform wavelength conversion, the data packet is discarded;

7. Determine whether the current optical switch has established a cross-connection, if the current optical switch has not established a connection, then search the command value list of the optical switch to establish a cross-connection; set the cross-connection duration of the current optical switch;

8. Multiplex the BDP data output by different channels into the target data packet, and send the target data packet to the optical receiving module within the duration of the cross-connection;

9. The control module waits to receive the next BCP, the optical cross-connect module waits to receive the next BDP, and repeats steps 4-8.

The utility model judges whether the current BDP will be congested according to the offset time in the BCP, and the wavelength, source address and destination address of the corresponding BDP through the identification unit, and if congestion occurs, the analysis unit controls the wavelength conversion unit to convert the wavelength of the current BDP to Convert to the wavelength of the idle channel, so as to ensure the smooth transmission of data.

The beneficial effects of the utility model are mainly manifested in: 1. It is a simple and reliable OXC system based on mature optical device technology, which can be used for the core node of the OBS network; 2. It has the function of all-optical cross-connection; 3. It allows Four wavelength signals perform wavelength conversion function; 4. Adopt FPGA to control the service source module and control module, support the execution of OXC control algorithm, and then can effectively use the existing network resources, reduce the congestion probability of the network, and improve the performance of the network; 5. After being equipped with a service source module and an optical transceiver module, the performance of the optical cross-connect module can be detected, which can be used as an optical network teaching experiment equipment; 6. With the OXC system (that is, the WSXC shown in prior art 1) that does not have wavelength conversion capability ) has a great advantage over the use of wavelength resources. Compared with the OXC system with full wavelength conversion capability (that is, the WIXC shown in prior art 2), the utilization rate of the wavelength converter is improved, the number of wavelength converters is reduced, and thus the cost and control difficulty are reduced, and the feasibility is increased.

Description of drawings

Fig. 1 is prior art WSXC structure

Fig. 2 is prior art WISC structure

Fig. 3 is a structural schematic diagram of the limited-wavelength internal variable optical cross-connector (L-WIXC) of the present invention

Figure 4 is a schematic diagram of the arrangement structure of six 2×2 off switches in a 4×4 optical switch

Figure 5 is a schematic diagram of the main ports of the control module

Figure 6 is a flowchart of the cross-connect method

Figure 7 is a schematic diagram of the structure of the optical network teaching experimental equipment equipped with a service source module, an optical transmitting module and an optical receiving module

Figure 8 is a schematic diagram of the structure of the light emitting module

Figure 9 is a schematic diagram of the structure of the light receiving module

Figure 10 is a schematic diagram of the main ports of the service source module

Figure 11 is a list of optical switch path status and command values

Detailed ways

Embodiment one

Refer to Figure 3-6, 11

The optical cross-connect device used for the core node of the optical burst switching network includes a service source module capable of cyclically and sequentially generating BCP and its corresponding BDP, the service source module is connected to the control module through the BCP channel, and the The service source module is connected to the optical cross-connect module through the optical transmission module. The optical transmission module is provided with a plurality of input optical fibers connected to the input end of the optical cross-connect module. The output optical fiber is connected to the optical receiving module; the optical cross-connect module is controlled by the control module;

The optical cross-connect module is provided with a first demultiplexer corresponding to the input optical fiber one-to-one, demultiplexing the BDP into BDP data with differences in multiple wavelengths, corresponding to the output optical fiber one-to-one, and demultiplexing the multiple wavelengths Differential BDP data is multiplexed as the first multiplexer of the target data packet, and the first demultiplexer is connected with the first multiplexer through the channel unit; the channel unit is connected with the BDP data One-to-one correspondence of the wavelength of the transmission channel composition;

The control module includes an identification unit connected to the BCP channel, capable of judging whether transmission congestion occurs with its corresponding BDP according to the current BCP, and connected with the optical cross-connect module, searching for a transmission channel in an idle state and obtaining an idle channel wavelength analysis unit;

The optical cross-connect module is provided with a wavelength conversion unit that converts the wavelength of the congested BDP into an idle channel wavelength, one of the output ends of the channel unit is connected to the input end of the wavelength conversion unit, and the The output end of the wavelength conversion unit is connected to one of the input ends of the channel unit;

The analysis unit is respectively connected with the channel unit and the wavelength conversion unit.

The BCP includes the type information of the control packet, and the priority, data type, optical wavelength number, source address, destination address, BDP packet length, offset time and parity bit of the BDP corresponding to it; BDP is made up of a plurality of Ethernet data packets, and described BDP is made up of protection field, synchronization field, burst packet length, grouping number, grouping length, IP grouping, data padding, check field, protection field; Described The BCP is generated one offset time earlier than the BDP.

The transmission channel is a first optical switch capable of connecting a specified input end to a required output end; the wavelength conversion unit includes a first optical switch whose input end is respectively connected to the output end of the first optical switch. Two optical switches, and a wavelength converter whose output ends are respectively connected to the input ends of the first optical switch, and the output ends of the second optical switch correspond to the wavelength converters one by one.

The optical transmitting module includes a DFB-based optical transmitter and a second multiplexer that can convert input electrical signals into optical signals and emit them; The signal optical receiver and the second demultiplexer constitute.

The optical transmitter and the second multiplexer of the optical transmission module are divided into three groups to form transmission units, and each transmission unit is connected to a first demultiplexer in the optical cross-connect module through an output optical fiber The optical receiver and the second demultiplexer of the optical receiving module are divided into three groups to form receiving units, and each receiving unit is connected to a first multiplexer in the optical cross-connect module through an input optical fiber connection; each optical fiber has 4 data wavelength channels; the optical cross-connect module is provided with 4 first optical switches and 1 second optical switch, and the optical switches are all 4×4 optical switches, so The wavelength converter described above is a single-channel wavelength converter.

The business source module uses a Poisson model to describe the traffic model of the data network, and satisfies the following basic assumptions:

(1) The time interval of traffic generated by external data sources is exponentially distributed, that is, the arrival process of data sources is a Poisson process, let {G(i)|i=1, 2, ..., N}, G(i) is the data packet The interval between i and i+1;

(2) The length of the traffic generated by the data source at one time obeys the exponential distribution, let {H(i)|i=1, 2, ..., N}, H(i) is the data length of the data packet i;

(3) G(i) and H(i) are independent of each other.

The transmission control protocol of the business source module is the JET (Just Enough Time) protocol, and the JET protocol uses a delayed reservation (Delayed Reservation) mode to reserve bandwidth, that is, each intermediate node is based on the BDP length information contained in the BCP and The offset time information automatically completes the selection of wavelength channels, the reservation and release of bandwidth resources, and the establishment and removal of cross-connections; the BDP can only be sent after waiting for an offset time (Offset Time).

Both the BCP and the BDP generated by the service source module are electrical signals.

The optical cross connection method of the present utility model comprises the following steps:

1. The business source module cyclically generates the burst control packet BCP and the burst data packet BDP corresponding to the BCP and carrying valid information. The BCP includes the type information of the control packet and the priority of the corresponding BDP Level, data type, optical wavelength number, source address, destination address, BDP packet length, offset time and check digit; the optical wavelength number of the BDP represents the transmission channel for transmitting the data packet; the BCP is sent through the BCP channel To the control module, the BDP is transmitted to the optical cross-connect module by dividing the BDP into a plurality of input optical fibers through the optical transmission module, and the BDP is a wavelength division multiplexing signal;

2. The optical cross-connect module demultiplexes the BDP in each input optical fiber into multiple BDP data, the wavelength of the BDP data is different, and the BDP data of the same wavelength are transmitted to the same first optical switch;

3. The control module initializes the path state and command value list of each optical switch, so that the designated input end of each first optical switch is connected with the required output end to form a transmission channel, thereby establishing a cross connection;

4. The control module accepts the BCP from the service source module, and selects the corresponding first optical switch as the current optical switch according to the current optical wavelength signal of the BDP corresponding to the BCP;

5. Determine whether the current optical switch has established a cross-connection. If the current optical switch has not established a connection, then search the command value list of the optical switch, establish a cross-connection, and set the duration of the current optical switch cross-connection; When the connection is established, it is judged whether the current channel is idle. If the channel is idle, it is considered that the wavelength conversion of the corresponding BDP data is unnecessary, and the duration of the cross-connection of the current optical switch is set. If the current channel is busy, it is considered that the wavelength conversion of the corresponding BDP data is required. ;

6. If wavelength conversion is required, determine whether the corresponding BDP data can perform wavelength conversion. If the BDP data can perform wavelength conversion, then search for an idle transmission channel optical switch, use the wavelength of the idle channel as the target wavelength, and use the wavelength of the idle channel as the target wavelength. The optical switch corresponding to the idle channel is the current optical switch, and the BDP is converted from the original wavelength to the destination wavelength and sent to the current optical switch; if the BDP cannot perform wavelength conversion, the data packet is discarded;

7. Determine whether the current optical switch has established a cross-connection, if the current optical switch has not established a connection, then search the command value list of the optical switch to establish a cross-connection; set the cross-connection duration of the current optical switch;

8. Multiplex the BDP data output by different channels into the target data packet, and send the target data packet to the optical receiving module within the duration of the cross-connection;

9. The control module waits to receive the next BCP, the optical cross-connect module waits to receive the next BDP, and repeats steps 4-8.

The utility model judges whether the current BDP will be congested according to the offset time in the BCP, and the wavelength, source address and destination address of the corresponding BDP through the identification unit, and if congestion occurs, the analysis unit controls the wavelength conversion unit to convert the wavelength of the current BDP to Convert to the wavelength of the idle channel, so as to ensure the smooth transmission of data.

Referring to accompanying drawing 3, it shows as a unidirectional transmission system with 3 links and 4 wavelengths, mainly including 1 cross-connect module (composed of 3 multiplexers, 3 demultiplexers, 4 4×4 first Optical switch, a 4×4 second optical switch and 4 wavelength converters) and a control module.

The 3 input fibers and the 3 output fibers are all standard single-mode fibers, and each fiber transmits 4 wavelengths, the wavelengths are 1490nm, 1510nm, 1530nm, and 1550nm respectively, carrying BDP data signals, while BCP control signals pass through Ordinary wires for transmission.

The multiplexer/demultiplexer multiplexes the BDP signals transmitted in the four wavelength channels of 1490nm, 1510nm, 1530nm, and 1550nm into a multiplexed signal and sends it into an optical fiber link, or will The wavelength division multiplexing signal transmitted in the root fiber link is demultiplexed into four wavelength channels of 1490nm, 1510nm, 1530nm, and 1550nm, and each wavelength channel is connected to a 4×4 optical switch corresponding to a specific wavelength.

The function of the 4×4 optical switch is to connect the specified input terminal with the required output terminal according to the control signal, but two input terminals cannot select the same output terminal at the same time, such an order is an illegal order.

The internal structure of the 4×4 optical switch is composed of six 2×2 optical switches. Referring to FIG. 4 , each optical switch has two states of parallel and cross. A 4×4 optical switch has 24 channel states in total, and the various channel states and corresponding control codes are listed in detail in FIG. 11 . The control code is an 8-bit long binary number, which is D7D6D5D4D3D2D1D0. Among them, the two digits of D1D0 control the output direction of input port 1, D2D3 controls the output direction of input port 2, and so on.

The wavelength converter is used to complete single-channel wavelength conversion, that is, input any wavelength of 1490nm or 1510nm or 1530nm or 1550nm, and convert it into any specified output wavelength of 1490nm or 1510nm or 1530nm or 1550nm for transmission.

The control module is based on an FPGA chip, embedded with an optimized cross-connection algorithm, and controls the cross-connection module according to the BCP control signal. And receive the data information obtained by the optical receiving module to count and analyze the accuracy rate of the data transmitted by the whole system.

With reference to accompanying drawing 5, described control module comprises 15 signal input ends, and what 3 of them input is BCP control signal, and other 12 are the electrical signals that are used to mark its performance after BDP transmission ends; 5 signal output ends, Connect with 5 optical switches.

Embodiment two

Refer to Figure 7-11

This embodiment is to use the utility model as a teaching experiment equipment for optical burst switching network courses, referring to Figure 7, including an optical cross-connect module, a control module, a service source module, an optical transmitting module and an optical receiving module.

Referring to accompanying drawing 8, described optical transmission module is divided into three groups by 12 DFB-based optical transmitters and 3 multiplexers, and the function of described optical transmitter is to convert the input electric signal into optical signal and transmit it out. The optical transmitting module converts the BDP data of the electrical signal transmitted by the service source into the BDP data of the optical signal, and multiplexes them into the three optical fiber links.

Referring to accompanying drawing 9, the optical receiving module is composed of 12 optical receivers and 3 demultiplexers divided into three groups, and the function of the optical receiver is to convert the received optical signal into an electrical signal. The optical receiving module demultiplexes the optical signal BDP data output from the optical cross-connect module, and converts the BDP data converted into electrical signals back to the control module.

Referring to accompanying drawing 10, the main chip of described service source module is FPGA, includes 3 signal input ends, is power supply, ground and reset respectively. There are also 15 output terminals, of which 3 output terminals output BCP electrical signals, and 12 output terminals output BDP electrical signals, which belong to 3 optical fiber links, and each optical fiber link includes 4 wavelength channels. The 3-way BCP electrical signal is connected to the control module, and the 12-way BDP electrical signal terminal is connected to the DFB in the optical transmitter module.

The content described in the embodiments of this specification is only an enumeration of the realization forms of the utility model concept, and the protection scope of the utility model should not be regarded as being limited to the specific forms stated in the embodiments, and the protection scope of the utility model also extends to Equivalent technical means that those skilled in the art can think of according to the concept of the utility model.

Claims (4)

1. the optical cross connection device that is used for core nodes of optical burst switching network, comprising can be circularly, successively produce the service source module of BCP and the BDP corresponding with it, described service source module is connected with control module by the BCP channel, described service source module is connected with the optical cross connect module by light emission module, described light emission module is provided with the many input optical fibres that are connected with the input of described optical cross connect module, and described optical cross connect module is connected with Optical Receivers by many output optical fibres; Described optical cross connect module is controlled by described control module;

Be provided with in the described optical cross connect module corresponding one by one with input optical fibre, be first demodulation multiplexer of the discrepant BDP data of a plurality of wavelength with the BDP demultiplexing, corresponding one by one with output optical fibre, be first multiplexer of target data bag with the discrepant BDP data multiplex of a plurality of wavelength, described first demodulation multiplexer is connected with described first multiplexer by Channel Elements; Described Channel Elements by with the wavelength of BDP data one to one transmission channel form;

It is characterized in that: described control module comprises with the BCP channel and connecting, can judge whether corresponding BDP with it transmits congested identification unit and be connected, seek the transmission channel that is in idle condition with described optical cross connect module and obtain the analytic unit of idle channel wavelength according to current BCP;

The wavelength Conversion that is provided with in the described optical cross connect module congested BDP is the wavelength conversion unit of idle channel wavelength, one of them output of described Channel Elements is connected with the input of described wavelength conversion unit, and the output of described wavelength conversion unit is connected with one of them input of described Channel Elements;

Described analytic unit is connected with wavelength conversion unit with described Channel Elements respectively.

2. the optical cross connection device that is used for core nodes of optical burst switching network as claimed in claim 1 is characterized in that: first optical switch of described transmission channel for the input of appointment being connected with desired output; Described wavelength conversion unit comprises second optical switch that input is connected with the output of described first optical switch respectively, with the wavelength shifter that output is connected with the input of described first optical switch respectively, the output of described second optical switch is corresponding one by one with described wavelength shifter.

3. the optical cross connection device that is used for core nodes of optical burst switching network as claimed in claim 2 is characterized in that: described light emission module comprises based on the optical sender and second multiplexer DFB, that can become light signal to launch the electrical signal conversion of input; Described Optical Receivers is to be made of the optical receiver and second demodulation multiplexer that the light signal that receives can be converted to the signal of telecommunication.

4. the optical cross connection device that is used for core nodes of optical burst switching network as claimed in claim 3, it is characterized in that: the optical sender of described light emission module and second multiplexer divide three groups to constitute transmitter units, and each transmitter unit is connected with one first demodulation multiplexer in the described optical cross connect module by an output optical fibre; The optical receiver of described Optical Receivers and second demodulation multiplexer divide three groups to constitute receiving elements, and each is accepted the unit and is connected with one first multiplexer in the described optical cross connect module by an input optical fibre; Every optical fiber has 4 data wavelength channels; Be provided with 4 first optical switches and 1 second optical switch in the described optical cross connect module, described optical switch is 4 * 4 optical switches, and described wavelength shifter is the single channel wavelength transducer.

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