Spatial ultra-large-capacity polarization multiplexing optical burst switching equipment, system and method

Abstract

The invention relates to a spatial ultra-large-capacity polarization multiplexing optical burst switching device, system and method. The device comprises an all-optical branching module, a label analysis module, an all-optical routing module, an upper speech channel module, a lower speech channel module, a laser communication terminal and an information processing module. The all-optical branching module transmits a data load to the all-optical routing module and the downlink channel module, and transmits a subcarrier label to the label analysis module; the label analysis module extracts a packet header label and transmits the packet header label to the information processing module; the information processing module outputs a routing control instruction to the all-optical routing module and outputs a downlink channel control instruction to the downlink channel module; the lower speech channel module demodulates the optical burst packet according to the lower speech channel control instruction, and the upper speech channel module is used for modulating and outputting upper speech channel information to the laser communication terminal according to the upper speech channel control instruction. According to the invention, the high-speed data code stream is divided on an optical path in an optical domain, and all-optical routing of spatial high-capacity burst data is effectively realized.

Description

Technical Field

[0001] The present invention relates to an optical burst switching system, and particularly to a space ultra-large-capacity polarization multiplexing optical burst switching device, system and method. Background Art

[0002] Due to the high cost and great difficulty in the construction of optical fiber network facilities, it is difficult to provide comprehensive communication coverage for all remote areas by unilaterally building a ground optical fiber network. The satellite network, because of its outstanding advantages such as high coverage and low latency, is expected to form complementary advantages with the ground optical network and jointly build the next-generation global coverage communication network system. Therefore, the construction of the satellite network has become a new key track for countries to seize the high ground of science and technology.

[0003] While the satellite network is booming, the demand for network capacity is also increasing day by day. Compared with radio frequency communication, free space laser communication has the advantages of large bandwidth, strong anti-interference ability, small terminal volume, etc., and is gradually becoming the main application technology for high-speed data transmission between satellites in the satellite Internet. While free space laser communication expands the data transmission rate between satellites, it also puts forward higher requirements for information processing technologies such as data routing of satellite nodes. Due to limited on-board resources and the electronic rate bottleneck of electrical switching, in the face of satellite network nodes with future Tbps capacity, if electrical switching stacking is adopted unilaterally, it has high energy consumption and huge resource consumption and is difficult to apply. In addition, considering the large space channel loss, high-speed inter-satellite laser communication requires carrying high-power lasers, and limited inter-satellite resources are difficult to support carrying too many high-power lasers, which will limit the application of wavelength-level optical switching technology commonly used in ground optical networks. Therefore, in the process of satellite network construction, it is imperative to add optical packet switching technology with large bandwidth and low power consumption. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the commonly used wavelength-level optical switching in the existing ground optical network is difficult to meet the large-capacity data exchange in the resource-limited space environment, and to provide a space ultra-large-capacity polarization multiplexing optical burst switching device, system and method. Through polarization multiplexing and wavelength division multiplexing, combined with the processing method of wavelength and polarization state splitting, it can not only perform large-granularity division on high-speed data code streams in the optical domain, but also reduce the information processing rate of each data signal, and effectively realize the all-optical routing of large-capacity burst data.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A space ultra-large-capacity polarization multiplexing optical burst switching device, characterized in that it includes a laser communication terminal, an all-optical splitting module, a label parsing module, an all-optical routing module, an up-link module, a down-link module, and an information processing module;

[0007] The laser communication terminal is used to receive multi-wavelength dual-polarization data streams from other switching devices and send multi-wavelength dual-polarization data streams of an all-optical routing module or an up-link module;

[0008] The all-optical splitting module is used to perform wavelength and polarization splitting on the multi-wavelength dual-polarization data stream received by the laser communication terminal to obtain a single-wavelength single-polarization data stream including data payloads and sub-carrier tags, and transmit the sub-carrier tags to a tag parsing module; wherein, the data payloads include large-granularity data payloads and small-granularity data payloads;

[0009] The tag parsing module is used to parse the sub-carrier tags of the all-optical splitting module, extract packet header tags therefrom, and transmit them to an information processing module;

[0010] The information processing module is used to parse the packet header tags, output routing control instructions to the all-optical routing module after discrimination and routing planning, and output down-link control instructions to the down-link module; or the information processing module discriminates and processes local electrical data packets, generates up-link control instructions and up-link information, and transmits them to the up-link module;

[0011] The all-optical routing module extracts large-granularity data payloads from the data payloads according to the routing control instructions, routes the large-granularity data payloads that need to be forwarded in the data payloads to the laser communication terminal, and outputs the large-granularity data payloads reaching the target node to the down-link module;

[0012] The down-link module extracts small-granularity data payloads from the data payloads according to the down-link control instructions, demodulates the small-granularity data payloads in the data payloads and the large-granularity data payloads reaching the target node input by the all-optical routing module, and outputs down-link information to the information processing module; the information processing module converts the small-granularity data payload information that needs to be routed in the down-link information into up-link control instructions and up-link information and transmits them to the up-link module, and sends the large-granularity data payloads and small-granularity data payloads reaching the target node to the local processing system;

[0013] The up-link module is used to modulate the up-link information into a multi-wavelength dual-polarization data stream according to the up-link control instructions and output it to the laser communication terminal.

[0014] Further, the all-optical splitting module is a splitting optical path for wavelength and polarization state, including an arrayed waveguide grating and a polarization beam splitter connected in sequence. The arrayed waveguide grating decomposes the multi-wavelength dual-polarization data stream of a single laser link into single-wavelength dual-polarization data streams, and then the polarization beam splitter decomposes them into single-wavelength single-polarization data streams.

[0015] Further, the label parsing module includes a label information extractor, which is used to extract the header label in the subcarrier label, convert it from optical to electrical, and then transmit it to the information processing module for label information parsing and routing planning.

[0016] Further, the all-optical routing module includes a non-blocking optical switch matrix and a driving circuit. The driving circuit changes the optical path structure of the non-blocking optical switch matrix according to the routing control instruction sent by the information processing module, and routes the data payload to the lower voice path module or the laser emission terminal port.

[0017] Further, the upper voice path module includes a circuit part, a polarization multiplexing header label generator, and an upper voice path signal loading and transmitting part; the circuit part controls the polarization multiplexing header label generator to generate a new label according to the upper voice path control instruction, and controls the upper voice path signal loading and transmitting part to modulate the upper voice path information into a multi-wavelength dual-polarization data stream and then send it to the laser communication terminal.

[0018] Further, the laser communication terminal includes an optical turntable and an optical transceiver path arranged on the optical turntable, and the optical transceiver path is used to realize the transceiver of space laser communication data.

[0019] A space ultra-large-capacity polarization multiplexing optical burst switching system, characterized in that it includes multiple satellites, a ground gateway station, and multiple users; communication is carried out between the satellites and the ground gateway station, and between the satellites and multiple users through microwave links. Each satellite includes at least one set of the space ultra-large-capacity polarization multiplexing optical burst switching equipment described in any one of claims 1-6 for communication between satellites.

[0020] A space ultra-large-capacity polarization multiplexing optical burst switching method, using the above-mentioned space ultra-large-capacity polarization multiplexing optical burst switching equipment, includes a routing link and a transceiver information link. The special feature is that the routing link includes the following steps:

[0021] 11) The laser communication terminal receives the multi-wavelength dual-polarization data stream exchanged by other satellites and transmits it to the all-optical splitting module;

[0022] 12) The all-optical splitting module performs wavelength and polarization splitting on the multi-wavelength dual-polarization data to obtain a single-wavelength single-polarization data stream including a data payload and a subcarrier label, and transmits the subcarrier label to the label parsing module; wherein, the data payload includes a large-granularity data payload and a small-granularity data payload;

[0023] 13) The label parsing module parses the subcarrier label of the all-optical splitting module, extracts the header label therefrom, and transmits it to the information processing module;

[0024] 14) The information processing module parses and discriminates the packet header label, outputs a routing control instruction to the all-optical routing module, and outputs a downlink control instruction to the downlink module; the all-optical routing module extracts large-granularity data payloads from the data payload according to the routing control instruction, and routes the large-granularity data payloads to be forwarded to the laser communication terminal for output; the downlink module extracts small-granularity data payloads from the data payload according to the downlink control instruction, demodulates the small-granularity data payloads and outputs them to the information processing module, and after being processed and routed by the information processing module, they are transmitted to the laser communication terminal for output by the uplink module;

[0025] The information receiving and transmitting link includes information reception and information transmission:

[0026] Information reception includes:

[0027] 21) The laser communication terminal receives multi-wavelength dual-polarization data streams exchanged by other satellites and transmits them to the all-optical splitting module;

[0028] 22) The all-optical splitting module performs wavelength and polarization splitting on the multi-wavelength dual-polarization data to obtain single-wavelength single-polarization data streams including data payloads and subcarrier labels, and transmits the subcarrier labels to the label parsing module; among them, the data payloads include large-granularity data payloads and small-granularity data payloads;

[0029] 23) The label parsing module parses the subcarrier labels of the all-optical splitting module, extracts the packet header labels from them, and transmits them to the information processing module;

[0030] 24) The information processing module parses and discriminates the packet header labels, outputs a routing control instruction to the all-optical routing module, and outputs a downlink control instruction to the downlink module; the all-optical routing module extracts large-granularity data payloads from the data payload according to the routing control instruction, and outputs the large-granularity data payloads reaching the target node to the downlink module; the downlink module extracts the small-granularity data payloads reaching the target node from the data payload according to the downlink control instruction, demodulates the small-granularity data payloads and the large-granularity data payloads reaching the target node input by the all-optical routing module, and outputs them to the information processing module, which are converted into electrical data packets and transmitted to the local processing system.

[0031] Information transmission includes:

[0032] 31) The information processing module receives the electrical data packets of the local processing system, discriminates and processes the electrical data packets of the local processing system, and outputs an uplink control instruction and uplink information to the uplink module;

[0033] 32) The uplink module generates new packet header labels according to the uplink control instruction, modulates the uplink information and then sends it to the laser communication terminal. Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0034] 1. The space ultra-large-capacity polarization-division multiplexing optical burst switching device, system and method of the present invention, through polarization-division multiplexing and wavelength-division multiplexing, combined with the processing method of wavelength and polarization-state splitting, have prominent advantages such as large bandwidth, low latency, and low power consumption, and can meet the data exchange requirements of satellite switching nodes with a data capacity of Tbps, effectively solving the problem that the existing on-board electrical switching technology and the wavelength-level optical switching technology commonly used in terrestrial optical networks are difficult to meet the future capacity data exchange in the resource-limited space environment, and at the same time minimizing the consumption of on-board resources and satellite battery life;

[0035] 2. A space ultra-large-capacity polarization-division multiplexing optical burst switching device, system and method of the present invention, through granularity-based routing of larger-granularity optical burst packets and smaller-granularity optical burst packets, combined with the idea of classifying and processing electrical data packets according to priority, can provide a higher quality of service for higher-priority data packets while improving the routing efficiency as much as possible by using all-optical switching;

[0036] 3. A space ultra-large-capacity polarization-division multiplexing optical burst switching device, system and method of the present invention, through the wavelength optical path and polarization optical path of the array waveguide to slow down the high-speed data code stream, can effectively reduce the pressure of data information processing and routing planning in the inter-satellite switching system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the composition of the space ultra-large-capacity polarization-division multiplexing optical burst switching device of the present invention;

[0038] Figure 2 Schematic diagram of the architecture of the inter-satellite networking in the satellite Internet in the embodiment of the present invention;

[0039] Figure 3 Schematic diagram of the process of granularity-based processing of optical data payloads and priority-based classification processing of electrical data information in the embodiment of the present invention;

[0040] Figure 4 Schematic diagram of the structure of the payload data and the header label in the embodiment of the present invention;

[0041] Figure 5 Schematic diagram of the principle structure of the polarization-division multiplexing optical burst switching system in the embodiment of the present invention;

[0042] Figure 6 Schematic diagram of the principle of label parsing and optical packet granularity-based processing in the embodiment of the present invention;

[0043] Figure 7 Schematic diagram of the principle structure of the up-link module in the embodiment of the present invention;

[0044] Figure 8It is a schematic diagram of the principle structure of the downlink module in the embodiment of the present invention;

[0045] Figure 9 It is a schematic diagram of the principle structure of the information processing module in the embodiment of the present invention;

[0046] Among them, 1 - all - optical splitting module, 2 - label parsing module, 3 - all - optical routing module, 4 - uplink module, 5 - downlink module, 6 - laser communication terminal, 7 - information processing module. Specific embodiments

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention, and the purpose is not to limit the protection scope of the present invention.

[0048] For the satellite switching node for ultra - large spatial data traffic, the present invention designs a set of ultra - large - capacity polarization - multiplexed optical burst switching equipment, system and method for space, as Figure 1 shown. By using the methods of polarization multiplexing and wavelength - division multiplexing, and matching with the optical splitting processing system for wavelength and polarization state splitting, it can not only perform large - granularity division on high - speed data code streams in the optical domain, but also reduce the information processing rate of each data signal, and can effectively achieve all - optical routing of large - capacity burst data. Aiming at the lack of efficient and flexible optical buffer in the optical domain, a routing mechanism of quickly down - routing and converting to electrical processing for small - granularity data code streams is adopted, effectively avoiding problems such as competition of data in the optical domain and packet loss caused by competition. As Figure 2 shown, it is a schematic diagram of the architecture of satellite - to - satellite networking in an embodiment of the system of the present invention. This architecture designs that one satellite carries four sets of space laser communication terminals to build space laser communication links with four adjacent satellites to achieve high - speed optical networks between satellites; the information transmission between the satellite and the ground gateway station and each user mainly relies on microwave communication to achieve all - weather satellite - to - ground information transmission.

[0049] As Figure 1 shown, an ultra - large - capacity polarization - multiplexed optical burst switching equipment for space of the present invention is composed of an all - optical splitting module 1, a label parsing module 2, an all - optical routing module 3, an uplink module 4, a downlink module 5, a laser communication terminal 6 and an information processing module 7, and each part is interconnected through optical fibers and cables.

[0050] The all-optical splitting module 1 is used for the coarse-granularity division of all-optical signals, mainly including the optical splitting optical paths for wavelength and polarization state, so as to decompose the multi-wavelength and dual-polarization data traffic of a single laser link into single-wavelength and dual-polarization data bitstreams through the wavelength-division optical path. Then, the single-wavelength data bitstream can be further decomposed into single-wavelength and single-polarization data streams through polarization splitting. This not only facilitates the all-optical routing of single-channel data but also facilitates the conversion of the data into an electrical signal after polarization-diversity coherent reception for the downlink and then performing electrical packet-switching processing.

[0051] The label parsing module 2 is used to implement the routing information parsing of optical burst packets. Through a narrowband filter and an optical circulator, the label parsing module can effectively separate the burst packet header from the data payload; the separated label enters the label information extractor for optoelectronic extraction and then is sent to the information processing module 7 for routing information processing of the optical data payload.

[0052] The all-optical routing module 3 is used to implement the all-optical routing of optical burst data, mainly composed of a non-blocking optical switch matrix and a supporting drive circuit. The core function of the optical switch matrix can be implemented based on a MEMS mechanical optical switch or based on an LCoS liquid crystal on silicon optical switch. The all-optical routing module 3 can establish an optical path from any input port to the downlink area or any output port according to the routing information instruction sent by the information processing module 7, thereby realizing the all-optical routing of optical burst data.

[0053] The uplink module 4 and the downlink module 5 are used to upload the information of the local node to other nodes in an all-optical form (uplink) or extract the information required by the local node from the data (downlink). The uplink module 4 is mainly used to implement the information loading of the label signal and the polarization multiplexing modulation of the uplink information. Its core function is mainly realized by devices such as a laser, a modulator, a phase shifter, a polarization controller, a drive circuit, a temperature control circuit, and a digital processing circuit. The downlink module 5 mainly realizes the wavelength-division data bitstream and the coherent reception of the polarization-diversity signal. Its core function is mainly realized by devices such as an AWG arrayed waveguide grating, a polarization beam splitter, a 90° mixer, a photodetector, a TIA transimpedance amplifier, a backend equalizer, a signal demodulator, and a digital processing circuit.

[0054] The laser communication terminal 6 is used to establish a stable laser communication link between satellites, mainly realizing the transceiver of space laser communication data through an optical turntable and the optical transceiver path. The turntable can be one-dimensional, two-dimensional, or multi-dimensional, and can realize the rotation of the optical transceiver path along the optical axis to perform the capture, tracking, and communication of space optical signals and establish a stable space laser communication link.

[0055] The information processing module 7 is used to implement the header parsing of optical burst packets, the planning of routing paths, the generation of routing instructions, and the information processing of the up and down circuits. It is the control center of the entire optical burst switching system. The core processor of the information processing module consists of an FPGA, and the rest includes a main control interface chip, a network data interface chip, an optical emission control circuit, an ADC interaction interface, corresponding driver circuits, and a data buffer. Its main function is to implement the information processing of the entire optical burst switching system and generate driver instructions for the corresponding modules.

[0056] As Figure 3 shown, according to the different types of data packets, the satellite node will classify and process them. For optical burst packets with a larger granularity, that is, when the transmission duration of the burst packet at the switching node is more than one order of magnitude higher than the node routing configuration time, the data packet will undergo all-optical routing processing. For data packets with a smaller granularity, they will be directly down-converted to electrical signals for processing. After the data packet is converted to an electrical signal, it is sent to the information processing module. If the forwarding priority of this data packet is high, a routing will be quickly planned for it, and then it will be transmitted to the target port through the up-conversion module and sent; otherwise, this data packet will wait for data packets with the same routing path to aggregate into a large-granularity burst packet, and then it will be transmitted to the target port through the up-conversion module and sent.

[0057] As Figure 4 shown, the header label is loaded on the two subcarrier sidebands of the central wavelength of the data payload. The byte lengths of the header label and the data payload can be changed according to needs. The header label and the padding code are sent before the data payload to complete the routing configuration of the satellite node before the data payload arrives at the node, and the protection time slot is set not to be shorter than the routing configuration time. In order to avoid the padding code interfering with the normal reception of the data payload, it is designed that the two are modulated in an orthogonal manner, and a padding code eraser is added to the optical path according to the selected modulation format to erase the padding code. In addition, the protection time slots at different positions in the data stream are variable. On the one hand, comparing the long-granularity burst packet and the short-granularity data packet, the latter directly determines the down-conversion; on the other hand, the protection time slots between data packets can be set according to the switching speed of the down-conversion switch, as long as it is ensured that the header label part of the data payload does not follow the down-conversion due to the down-conversion switch not being turned off.

[0058] As Figure 5 , Figure 6As shown in the figure, the all-optical splitting module 1 is a splitting optical path for wavelength and polarization state, including an arrayed waveguide grating and a polarization beam splitter connected in sequence. The arrayed waveguide grating splits the multi-wavelength and dual-polarization data stream of a single laser link, and then the polarization beam splitter decomposes it into a single-wavelength and single-polarization state data stream; the single-wavelength and single-polarization state data stream includes data payload and subcarrier tags. By implementing wavelength and polarization splitting through the arrayed waveguide grating and the polarization beam splitter, the data rate on each branch can be significantly reduced. With reasonable algorithm scheduling and traffic regulation, all-optical routing of burst data packets can be achieved through a non-blocking all-optical routing matrix.

[0059] Label parsing includes a narrowband filter, an optical circulator, and a label information extractor. The separation of the header label and the data payload is mainly achieved by the narrowband filter and the optical circulator, while the label information extractor realizes the extraction of the optical-to-electrical conversion of the header label. The separated label information is parsed and routed by the information processing module. At this time, according to different granularities of the data packets judged by the label information, there will be different instruction mechanisms: if it is judged as a large-granularity data packet, on the one hand, a routing drive instruction is generated to drive the circuit to control the non-blocking all-optical routing matrix, and on the other hand, a new label generation instruction is generated to control the label generator to generate a new label; if it is judged as a small-granularity data packet, a downlink instruction is directly sent to control the opening of the downlink switch, so that the data packet directly enters the downlink electro-optic conversion process. Once all the data packets of this data packet have been downlinked, the downlink switch is immediately closed to prevent subsequent data streams from following the downlink.

[0060] As Figure 7 shown in the figure, the uplink module 4 mainly consists of a circuit part, a polarization multiplexed header label generator, and an uplink signal loading and transmitting part. The information processing module 7 discriminates and processes the local electrical data packets, and transmits the uplink control instruction and the uplink signal to the uplink module 4. According to the control instruction, the circuit part of the uplink module, on the one hand, controls the label generator to generate a new label, and on the other hand, controls the information loading and transmitting part to modulate the uplink signal and then transmit it. Information loading and transmitting mainly realizes single-channel 50 Gbps QPSK modulated data through a laser, a pair of MZM modulators, and a π / 2 phase shifter; the two-channel modulated data can achieve polarization multiplexing through a polarization controller, so that the single-wavelength modulated data rate reaches 100 Gbps. The header label generated by the label generator mainly realizes the same polarization state as the data payload through the polarization controller, so as to ensure that the header label can correctly correspond to the data burst packet.

[0061] As Figure 8As shown in the figure, the lower path module 5 mainly uses passive optical devices such as an AWG arrayed waveguide grating and a polarization beam splitter to demultiplex different wavelengths and polarization states, and then uses a local oscillator light combined with a 90° mixer to achieve polarization diversity reception, so that the data traffic of each branch is controlled below the electronic rate bottleneck to ensure the efficient operation of the information processing node. The data detected by the detector is sent to the data processing circuit and undergoes preliminary processing through devices such as a TIA transimpedance amplifier, a backend equalizer, a signal demodulator, and a digital processing circuit in sequence.

[0062] As Figure 9 shown in the figure, the information processing module 7 mainly consists of an FPGA, a main control interface chip, a network data interface chip, an ADC interaction interface, a drive circuit, and a data buffer. Different devices are interconnected through electrical signals to achieve efficient information processing of the entire system.

[0063] The main parameters of each device in this embodiment are as follows: The laser type is a DFB butterfly laser, the output power ≥ 8 dB, continuous light within the C band is generated, and the wavelength difference between different lasers is 1.5 nm; the AWG arrayed waveguide router is a customized version for the laser wavelength, and the wavelengths of each output port match the laser wavelength; the photodetector is a photoelectric conversion device with a responsivity ≥ 0.95 A / W within the C band and a bandwidth greater than 25 Gbps.

[0064] A method for signal reception using the above polarization multiplexing space optical burst switching system specifically includes the following steps:

[0065] 1) In the satellite optical network system, it is set that one satellite carries four sets of space laser communication devices and can build four reliable space laser communication links with four adjacent satellites. It is set that each space laser communication link uses wavelength division multiplexing of 2 wavelengths, and each wavelength encodes a data stream of 100 Gbps in a dual-polarization QPSK modulation format. Then the inter-satellite interconnection of a single satellite node will pass through 4 high-speed data streams of 200 Gbps. Considering the uplink and downlink requirements of not less than 200 Gbps, the data capacity of a single satellite node will reach the Tbps level.

[0066] 2) The AWG arrayed waveguide grating is used to perform wavelength division demultiplexing processing on a single-channel dual-polarization wavelength division multiplexing high-speed data stream, so that optical data signals of different wavelengths are decomposed into different optical fiber channels, realizing the conversion of a 200 Gbps wavelength division multiplexing dual-polarization signal into two 100 Gbps single-wavelength dual-polarization signals.

[0067] 3) The optical signals with different polarization states at the same wavelength are split by a polarization beam splitter, and then decomposed into different optical fiber channels again, converting the 100Gbps single-wavelength dual-polarization state signal into two 50Gbps single-wavelength single-polarization state signals. The single-channel optical data stream after speed reduction is more conducive to realizing all-optical data routing.

[0068] 4) The optical signal with a single-wavelength single-polarization state enters the label parsing module. The packet header label carries the basic characteristics and routing information of the data payload with as short a data bit as possible. It is loaded on the subcarrier of the padding code with the same wavelength as the data payload, and the data lengths of the packet header label and the padding code are basically the same. In addition, to distinguish the padding code from the data payload, the two can be modulated in an orthogonal manner. For example, the data payload is encoded in the QPSK modulation format, and the padding code is encoded in the intensity modulation format.

[0069] 5) Through the packet header label, the information processing module 7 can perform processing on the optical payload data in different granularities. For the optical burst packet with a larger granularity, the data packet will be subjected to all-optical routing processing. For the data packet with a small granularity, it is allowed to set a fast drop path label for drop path optical-to-electrical conversion processing, and at the same time perform classification routing according to the priority of the data packet. For the data packet after electro-conversion, the information processing module 7 will judge and process it. It is possible to plan for the small-granularity data packet to quickly access the target laser port or form a longer burst packet with other data packets of the same target node at the current information processing node, and then access the target laser port of the laser communication terminal 6 through the access module 4.

[0070] 6) The information processing of the packet header label first realizes the separation of the label and the data payload through a narrowband filter and an optical circulator. After the separated label data is converted into electrical data through a photodetector, a transimpedance amplifier, and an equalization circuit, it is sent to the information processing module 7 for parsing and routing planning. According to the parsing result, the information processing module 7 sends a routing control instruction to the all-optical routing module 3 to construct a correct routing optical path to ensure that the optical burst packet is correctly routed to the target laser port of the laser communication terminal 6; or, sends a routing control instruction to the drop path module (5), and after processing the small-granularity data payload received by the drop path module (5), it is transmitted to the target laser port of the laser communication terminal 6 by the access module 4.

[0071] In addition, the time required for label parsing, routing planning, and optical switch matrix control can be jointly achieved through an optical fiber delay line and adding a protection time slot before the burst packet.

[0072] 7) When the data information is dropped, it is first transported to different wavelength processing branches through an AWG arrayed waveguide router, and then the data optical-to-electrical conversion processing is realized through a polarization diversity coherent receiver.

[0073] 8) The uplink information data realizes the loading of dual-polarization QPSK information data by controlling the modulator to modulate lasers of different wavelengths. The modulation optical paths of different wavelengths directly correspond to the routing directions of different output ports, thereby realizing the function of transmitting the uplink data information to any adjacent satellite node.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A polarization multiplexing optical burst switching device with an extremely large spatial capacity, characterized in that: It includes a laser communication terminal (6), an all-optical splitting module (1), a label parsing module (2), an all-optical routing module (3), an up-link module (4), a down-link module (5), and an information processing module (7); The laser communication terminal (6) is used to receive multi-wavelength dual-polarization data streams from other switching devices and send multi-wavelength dual-polarization data streams of the all-optical routing module or the up-link module; The all-optical splitting module (1) is used to perform wavelength and polarization splitting on the multi-wavelength dual-polarization data stream received by the laser communication terminal (6) to obtain a single-wavelength single-polarization data stream including data payloads and sub-carrier labels, and transmit the sub-carrier labels to the label parsing module (2); wherein, the data payloads include large-granularity data payloads and small-granularity data payloads; The label parsing module (2) is used to parse the sub-carrier labels of the all-optical splitting module (1), extract the packet header labels therefrom, and transmit them to the information processing module (7); The information processing module (7) is used to parse the packet header labels, output routing control instructions to the all-optical routing module (3) after discrimination and routing planning, and output down-link control instructions to the down-link module (5); or the information processing module (7) discriminates and processes local electrical data packets, generates up-link control instructions and up-link information, and transmits them to the up-link module (4); The all-optical routing module (3) extracts large-granularity data payloads from the data payloads according to the routing control instructions, routes the large-granularity data payloads that need to be forwarded in the data payloads to the laser communication terminal (6), and outputs the large-granularity data payloads reaching the target node to the down-link module (5); The down-link module (5) extracts small-granularity data payloads from the data payloads according to the down-link control instructions, demodulates the small-granularity data payloads in the data payloads and the large-granularity data payloads reaching the target node input by the all-optical routing module (3), and outputs down-link information to the information processing module (7); the information processing module (7) converts the small-granularity data payload information that needs to be routed in the down-link information into up-link control instructions and up-link information and transmits them to the up-link module (4), and sends the large-granularity data payloads and small-granularity data payloads reaching the target node to the local processing system; The up-link module (4) is used to modulate the up-link information into a multi-wavelength dual-polarization data stream according to the up-link control instructions and output it to the laser communication terminal (6).

2. The ultra-large-capacity polarization-division multiplexing optical burst switching device according to claim 1, characterized in that: The all-optical splitting module (1) is an optical splitting optical path for wavelength and polarization state, including a sequentially connected arrayed waveguide grating and a polarization beam splitter. The arrayed waveguide grating decomposes the multi-wavelength dual-polarization data stream of a single laser link into single-wavelength dual-polarization data streams, and then the polarization beam splitter decomposes them into single-wavelength single-polarization data streams.

3. The space ultra-large-capacity polarization-division multiplexing optical burst switching device according to claim 2, wherein: The label parsing module (2) includes a label information extractor. The label information extractor is used to extract the packet header labels in the sub-carrier labels, perform optical-to-electrical conversion, and then transmit them to the information processing module (7) for label information parsing and routing planning.

4. The space ultra-large capacity polarization multiplexing optical burst switching device according to claim 3, characterized in that: The all-optical routing module (3) includes a non-blocking optical switch matrix and a driving circuit. The driving circuit changes the optical path structure of the non-blocking optical switch matrix according to the routing control instruction sent by the information processing module (7), and routes the data payload to the downlink module (5) or the laser emission terminal (6) port.

5. The ultra-large-capacity polarization-division multiplexing optical burst switching device according to claim 4, characterized in that: The uplink module (4) includes a circuit part, a polarization multiplexed packet header tag generator, and an uplink signal loading and transmitting part; the circuit part controls the polarization multiplexed packet header tag generator to generate a new tag according to the uplink control instruction, and controls the uplink signal loading and transmitting part to modulate the uplink information into a multi-wavelength dual-polarization data stream and then send it to the laser communication terminal (6).

6. The ultra-large-capacity polarization-division multiplexing optical burst switching device according to claim 5, wherein: The laser communication terminal (6) includes an optical turntable and an optical transceiver path arranged on the optical turntable, and the optical transceiver path is used to realize the transceiver of space laser communication data.

7. A polarization multiplexed optical burst switching system with extremely large space capacity, characterized in that: It includes multiple satellites, a ground gateway station, and multiple users; communication is carried out between the satellites and the ground gateway station, and between the satellites and multiple users through microwave links. Each satellite includes at least one set of the space ultra-large-capacity polarization multiplexed optical burst switching device according to any one of claims 1-6, which is used for communication between satellites.

8. A method for optical burst switching with ultra-large spatial capacity and polarization multiplexing, which uses the optical burst switching device with ultra-large spatial capacity and polarization multiplexing described in claim 1, includes a routing section and a section for transmitting and receiving information, and is characterized in that, The routing link includes the following steps: 11) The laser communication terminal (6) receives the multi-wavelength dual-polarization data stream exchanged by other satellites and transmits it to the all-optical splitting module (1); 12) The all-optical splitting module (1) performs wavelength and polarization splitting on the multi-wavelength dual-polarization data to obtain a single-wavelength single-polarization data stream including a data payload and a sub-carrier tag, and transmits the sub-carrier tag to the tag parsing module (2); among them, the data payload includes a large-granularity data payload and a small-granularity data payload; 13) The tag parsing module (2) parses the sub-carrier tag of the all-optical splitting module (1), extracts the packet header tag from it, and transmits it to the information processing module (7); 14) The information processing module (7) parses and discriminates the packet header tag, outputs a routing control instruction to the all-optical routing module (3), and outputs a downlink control instruction to the downlink module (5); the all-optical routing module (3) extracts the large-granularity data payload from the data payload according to the routing control instruction, and routes the large-granularity data payload that needs to be forwarded to the laser communication terminal (6) for output; the downlink module (5) extracts the small-granularity data payload from the data payload according to the downlink control instruction, demodulates the small-granularity data payload and outputs it to the information processing module (7), and after being processed and routed by the information processing module (7), it is transmitted to the laser communication terminal (6) for output by the uplink module (4); The information transceiver link includes receiving information and sending information: Receiving information includes: 21) The laser communication terminal (6) receives the multi-wavelength dual-polarization data stream exchanged by other satellites and transmits it to the all-optical splitting module (1); 22) The all-optical splitting module (1) performs wavelength and polarization splitting on the multi-wavelength dual-polarization data to obtain a single-wavelength single-polarization data stream including a data payload and a sub-carrier tag, and transmits the sub-carrier tag to the tag parsing module (2); among them, the data payload includes a large-granularity data payload and a small-granularity data payload; 23) The label parsing module (2) parses the subcarrier labels of the all-optical splitting module (1), extracts the packet header labels therefrom, and transmits them to the information processing module (7); 24) The information processing module (7) parses and discriminates the packet header labels, outputs a routing control instruction to the all-optical routing module (3), and outputs a demultiplexing control instruction to the demultiplexing module (5); the all-optical routing module (3) extracts large-granularity data payloads from the data payload according to the routing control instruction, and outputs the large-granularity data payloads reaching the target node to the demultiplexing module (5); the demultiplexing module (5) extracts the small-granularity data payloads reaching the target node in the data payload according to the demultiplexing control instruction, and after demodulating the small-granularity data payloads and the large-granularity data payloads reaching the target node input by the all-optical routing module (3), outputs them to the information processing module (7), which are converted into electrical data packets and transmitted to the local processing system. The sending information includes: 31) The information processing module (7) receives the electrical data packets of the local processing system, discriminates and processes the electrical data packets of the local processing system, and outputs a multiplexing control instruction and multiplexing information to the multiplexing module (4); 32) The multiplexing module (4) generates new packet header labels according to the multiplexing control instruction, modulates the multiplexing information, and then sends it to the laser communication terminal (6).

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