Optical signal transceiver switching unit, distributed optical switching system and its expansion method

Abstract

The present invention relates to an optical signal transceiver and switching unit, a distributed optical switching system and an extension method thereof. It has N input / output optical ports, and each optical port can transmit and receive optical signals simultaneously. The optical signal transceiver and switching unit includes: an N×N cyclic addressing arrayed waveguide grating router, with N optical ports on one side serving as internal input / output optical ports, and N optical ports on the other side serving as the input / output optical ports of the optical transceiver and switching unit; N tunable optical modules, interconnected with the N internal input / output optical ports of the cyclic addressing arrayed waveguide grating router in one-to-one correspondence; the tunable optical module has an optical emission unit and an optical reception unit; a control main board, electrically connected to the N tunable optical modules, for controlling the corresponding tunable optical module to emit a specified wavelength optical signal with a corresponding wavelength according to the received management information; the management information received by the control main board is sent by a host computer or obtained by demodulating the optical signal received by the optical reception unit.

Description

Technical Field

[0001] The present invention relates to an optical signal transceiver and switching unit, a distributed optical switching system and an expansion method thereof, and is applicable to the field of optical network communication technology. Background Art

[0002] In the information age, with the rapid growth of applications such as cloud computing, data centers, Internet of Things, virtual reality, and high-definition short videos, the global data volume has grown explosively, and it is expected that the future global data annual growth will remain at about 50%. And 90% of the global data comes from data centers. To process large-scale massive data, it is necessary to continuously expand the infrastructure of big data centers, especially optical switching system devices.

[0003] To cope with the rapid growth of data volume, in addition to supporting large-capacity optical switching, optical switching devices also require the scalability of the optical switching system and easy capacity upgrade.

[0004] Existing optical switching devices mainly include the following types:

[0005] 1. Traditional switching systems based on electro-optical-electrical conversion require multiple pairs of optical module data forwarding for electro-optical and electrical conversion. The number of optical modules used is relatively large, and it is difficult to expand the hardware system (see Figure 1 ).

[0006] 2. WSS ROADM-based ones. The biggest feature of WSS is that each wavelength can be independently switched. A multi-port WSS module can independently allocate any wavelength to any path. Therefore, the ROADM based on WSS technology has multiple degrees of freedom and can realize Mesh network interconnection. The technology of large-capacity WSS is difficult (see Figure 2 ).

[0007] 3. Optical switching systems based on optical cross switches. The production of optical cross switches in this system is difficult and costly (see Figure 3 ).

[0008] 4. Optical switching systems based on tunable wavelength converters and Cyclic AWG (see Figure 4 , 5 , 6), and realize large-capacity optical switching through cascading or multiplexing structures. However, the above structures are all lumped optical switching, and the expansion of the total capacity is limited by the number of ports of AWG and optical cross switches, and it is not convenient for arbitrary expansion. Summary of the Invention

[0009] The technical problem to be solved by the present invention is: in view of the above problems, to provide an optical signal transceiver and switching unit, a distributed optical switching system and an expansion method thereof.

[0010] The technical solution adopted by the present invention is as follows: An optical signal transceiver and switching unit, characterized in that it has N input / output optical ports, and each optical port can simultaneously transmit and receive optical signals. The optical signal transceiver and switching unit includes:

[0011] An NxN cyclic addressing arrayed waveguide grating router, with N optical ports on one side serving as internal input / output optical ports, and N optical ports on the other side serving as the input / output optical ports of the optical signal transceiver and switching unit;

[0012] N tunable optical modules, which are interconnected with the N internal input / output optical ports of the cyclic addressing arrayed waveguide grating router one by one; the tunable optical module has an optical transmitting unit and an optical receiving unit, wherein the optical transmitting unit can send optical signals containing data information and management information through the output optical port of the cyclic addressing arrayed waveguide grating router, and the optical receiving unit can receive optical signals containing data information and management information sent by a remote node through the cyclic addressing arrayed waveguide grating router;

[0013] A control main board, electrically connected to the N tunable optical modules, for controlling the corresponding tunable optical module to emit a specified wavelength optical signal of a corresponding wavelength according to the received management information, so that the specified wavelength optical signal emitted by the corresponding tunable optical module is emitted from a specified optical port on the other side after passing through the cyclic addressing arrayed waveguide grating router;

[0014] The management information received by the control main board is sent by a host computer or obtained by demodulating the optical signal received by the optical receiving unit.

[0015] An optical signal transceiver and switching unit, characterized in that it has N output optical ports capable of emitting optical signals and N input optical ports capable of receiving optical signals. The optical signal transceiver and switching unit includes:

[0016] An NxN cyclic addressing arrayed waveguide grating router I, with N optical ports on one side serving as internal input optical ports, and N optical ports on the other side serving as the output optical ports of the optical signal transceiver and switching unit;

[0017] N optical transmitting units, which are interconnected with the N internal input optical ports of the cyclic addressing arrayed waveguide grating router I one by one, and the optical transmitting unit can send optical signals containing data information and management information to the cyclic addressing arrayed waveguide grating router I;

[0018] An NxN cyclic addressing arrayed waveguide grating router II, with N optical ports on one side serving as internal output optical ports, and N optical ports on the other side serving as the input optical ports of the optical signal transceiver and switching unit;

[0019] N optical receiving units, which are interconnected with the N internal output optical ports of the cyclic addressing arrayed waveguide grating router II one by one. The optical receiving units can receive the optical signals containing data information and management information output by the cyclic addressing arrayed waveguide grating router II;

[0020] A control main board, which is electrically connected to the N optical transmitting units and the N optical receiving units, is used to control the corresponding optical transmitting unit to emit a specified wavelength optical signal with a corresponding wavelength according to the received management information, so that the specified wavelength optical signal emitted by the corresponding optical transmitting unit passes through the cyclic addressing arrayed waveguide grating router I and is emitted from the specified output optical port on the other side;

[0021] The management information received by the control main board is sent by the upper computer or demodulated from the optical signal received by the optical receiving unit.

[0022] The management information is transmitted through a low-bitrate management channel constructed by the tone-on-tone technology;

[0023] After the control main board of the transmitting-end optical signal transceiver switching unit receives the management information, it loads the low-bitrate management information into the optical signal;

[0024] After fiber-optic transmission, the management information in the optical signal is demodulated by the optical receiving unit in the receiving-end optical signal transceiver switching unit into a low-bitrate management signal separated from the high-bitrate data information. The low-bitrate management signal is sent to the control main board after denoising and amplification.

[0025] The management information includes network status change information, wavelength switching information, and synchronization control signals.

[0026] The optical transmitting unit consists of a tunable laser for emitting optical signals and a driving circuit; the optical receiving unit consists of a detector for receiving optical signals and a receiving circuit.

[0027] A distributed optical switching system has several nodes, and is characterized in that: the nodes are directly interconnected by optical fibers or indirectly interconnected by optical fibers and nodes. Each node includes a server cluster or a host, and the optical signal transceiver switching unit as described above;

[0028] The server cluster or the host is interconnected with the optical signal transceiver switching unit in the same node. The server cluster or the host sends and receives data through the optical signal transceiver switching unit interconnected with it;

[0029] The optical ports of the optical signal transceiver switching unit in the node are directly connected to the corresponding optical ports of the optical signal transceiver switching unit in another node in the system by optical fibers, or indirectly connected to the corresponding optical ports of the optical signal transceiver switching unit in another node in the system through one or more intermediate nodes.

[0030] The control main board in the optical signal transceiver and switching unit of the sending end node acquires the data to be transmitted and management information sent by the server cluster or host in the same node;

[0031] The control main board of the optical signal transceiver and switching unit determines the wavelength of the signal emitted by the tunable laser in the optical emission unit according to the management information, and controls the corresponding optical emission unit to emit an optical signal with a specified wavelength in combination with the data to be transmitted;

[0032] The optical signal with the specified wavelength emitted by the optical emission unit is transmitted to the corresponding internal input optical port on the cyclic addressing arrayed waveguide grating router, and the cyclic addressing arrayed waveguide grating router emits the optical signal with the specified wavelength received by the corresponding internal input optical port from the optical port corresponding to the management information on the other side;

[0033] The optical signal emitted by the sending end node is directly transmitted to the receiving end node corresponding to the management information directly connected to it through the corresponding optical fiber, or is transmitted to the receiving end node corresponding to the management information indirectly connected to it through one or more intermediate nodes;

[0034] The control main board of the optical signal transceiver and switching unit of the receiving end node demodulates the data information and management information from the received optical signal, and uploads the data information to the server cluster or host in the same node after confirming that the management information corresponds to this node.

[0035] The optical signal transceiver and switching unit of the intermediate node demodulates the data information and management information from the optical signal sent by the previous node;

[0036] The control main board determines the wavelength of the signal emitted by the tunable laser in the corresponding optical emission unit according to the management information, and controls the corresponding optical emission unit to emit an optical signal with a specified wavelength in combination with the data to be transmitted;

[0037] The optical signal with the specified wavelength emitted by the optical emission unit is transmitted to the corresponding internal input end on the cyclic addressing arrayed waveguide grating router, and the cyclic addressing arrayed waveguide grating router emits the optical signal with the specified wavelength received by the corresponding internal input end from the optical port corresponding to the management information on the other side.

[0038] An expansion method for the distributed optical switching system, which is used to add nodes to the existing distributed optical switching system, and is characterized in that:

[0039] Connect the output optical port of the optical signal transceiver and switching unit in the newly added node to the input optical port of the optical signal transceiver and switching unit on the node in the existing distributed optical switching system through an optical fiber;

[0040] Connect the input optical port of the optical signal transceiver and switching unit in the newly added node to the output optical port of the optical signal transceiver and switching unit on the node in the existing distributed optical switching system through an optical fiber;

[0041] Update the direct and indirect connection relationships between each optical port of the optical signal transceiver and switching unit in each node and the remaining nodes in the system.

[0042] The beneficial effects of the present invention are as follows: In the present invention, the optical signal transceiver and switching unit utilizes the wavelength routing function of the NxN cyclic addressing arrayed waveguide grating router (a specific wavelength signal input from a specific input optical port can be output from a specific output optical port), and in combination with N optical emission units, it can control the optical port through which the optical signal emitted by the optical emission unit is output after passing through the cyclic addressing arrayed waveguide grating router. The cyclic addressing arrayed waveguide grating router can couple different wavelength optical signals emitted by multiple optical emission units to the same output optical port.

[0043] In the present invention, the NxN cyclic addressing arrayed waveguide grating router is combined with N optical receiving units, and can separate multiple different wavelength optical signals (if any) from the received external optical signals after the cyclic addressing arrayed waveguide grating router receives the external optical signals. The multiple different wavelength optical signals are respectively sent to multiple optical receiving units, and the optical receiving units demodulate the management information and data information from the optical signals they receive.

[0044] In the present invention, the distributed optical switching system adopts a distributed optical switching architecture. Combining the characteristics that the optical signal transceiver and switching unit can determine the optical signal output port as needed, on the one hand, it can achieve on-demand expansion of the switching system without replacing the existing switching system units and is not limited by the number of ports of the optical signal transceiver and switching unit; on the other hand, it can achieve mutual protection between the optical signal transceiver and switching units on different paths. Description of the Drawings

[0045] Figures 1 - 6 It is a schematic structural diagram of the prior art.

[0046] Figure 7 It is a schematic structural diagram of the distributed optical switching system in the embodiment (taking 5 network nodes as an example, operating in full connection).

[0047] Figure 8 It is a schematic diagram of the single-fiber bidirectional structure of the optical signal transceiver and switching unit in the embodiment.

[0048] Figure 9 It is a schematic structural diagram of the tunable optical module in the embodiment.

[0049] Figure 10 It is a schematic structural diagram of the non-full connection of the distributed optical switching system in the embodiment (taking 5 network nodes as an example, operating in non-full connection).

[0050] Figure 11 It is a schematic structural diagram of the tree-shaped distributed optical switching system in the embodiment.

[0051] Figure 12Schematic diagram of the dual-fiber structure of the optical signal transceiver and switching unit in the embodiment. Detailed implementation manner

[0052] Embodiment 1: This embodiment is a distributed optical switching system, which has several nodes, and each node includes an optical signal transceiver and switching unit.

[0053] Figure 7 Schematic diagram of the structure of the distributed optical switching system in the embodiment. The optical signal transceiver and switching unit 1 in each node is directly interconnected with the optical signal transceiver and switching units in the other 4 nodes through optical fibers or waveguides 2, forming a fully connected structure of the distributed optical switching system.

[0054] In this example, each node in the distributed optical switching system has an optical signal transceiver and switching unit, and each optical signal transceiver and switching unit has N (N is greater than or equal to 4 in this example) input / output optical ports. Any 4 input / output optical ports of the optical signal transceiver and switching unit are respectively connected to a certain input / output optical port on the optical signal transceiver and switching unit in the other 4 nodes.

[0055] Figure 8 Schematic diagram of the single-fiber bidirectional structure of the optical signal transceiver and switching unit in the embodiment. The optical signal transceiver and switching unit 1 is composed of a tunable optical module 11, an NxN cyclic addressing arrayed waveguide grating router 14, and a control main board 16. One side of the cyclic addressing arrayed waveguide grating router has N internal input / output optical ports, and the other side has N external input / output optical ports. There are N tunable optical modules, which correspond one-to-one to the N internal input / output optical ports on one side of the cyclic addressing arrayed waveguide grating router 14. The input / output optical ports 12 of the tunable optical module are interconnected with the corresponding internal input / output optical ports on one side of the cyclic addressing arrayed waveguide grating router 14 through optical fibers or waveguides. The external input / output optical ports on the other side of the cyclic addressing arrayed waveguide grating router 14 serve as the N input / output optical ports of the optical signal transceiver and switching unit, and the input / output optical ports of the optical signal transceiver and switching unit can simultaneously transmit and receive optical signals.

[0056] Figure 9FIG. 0 is a schematic structural diagram of the tunable optical module 11 in the embodiment. The tunable optical module 11 includes a filter 104, an optical transmitting unit, and an optical receiving unit. The optical transmitting unit consists of a tunable laser diode TLD 101 that emits an optical signal and a driving circuit, and is capable of transmitting an optical signal containing high-bit-rate data information and low-bit-rate management information; the optical receiving unit consists of a detector (in this example, a photodiode PD102) that receives an optical signal and a receiving circuit, and is capable of receiving an optical signal containing high-bit-rate data information and low-bit-rate management information. In this example, the tunable laser diode TLD 101 and the photodiode PD102 are mounted on the driving and receiving circuit board 103, and the driving circuit and the receiving circuit are fabricated on the driving and receiving circuit board 103.

[0057] In this embodiment, after the optical signal emitted by the tunable laser diode TLD 101 passes through the filter 104, the optical signal is output through the module input / output optical port 12; the optical signal input to the module input / output optical port 12 is received by the photodiode PD102 after passing through the filter 104. In this example, the filter 104 can be replaced by a circulator to achieve the wavelength-independent characteristic of filtering the input and output signals.

[0058] In this example, the control main board 16 is electrically connected to N tunable optical modules 11. The control main board 16 controls the corresponding tunable optical module 11 to emit a specified wavelength optical signal of a corresponding wavelength according to the received management information, so that the specified wavelength optical signal emitted by the corresponding tunable optical module passes through the cyclic addressing arrayed waveguide grating router 14 and is emitted from a specified external input / output optical port on the other side of the cyclic addressing arrayed waveguide grating router.

[0059] In this embodiment, the management information received by the control main board is sent to the control main board by the host computer in the same node or sent to the control main board after the management information is demodulated from the optical signal received by the optical receiving unit.

[0060] In this embodiment, the management information includes network status change information, wavelength switching information, and synchronization control signals. The network status change information includes the network status information of the optical transceiver switching node and the transmission path information determined according to the combination of the sending-end node and the receiving-end node and the direct and indirect connection relationships between the nodes in the system; the wavelength switching information is used to control the switching of the wavelength channels of the tunable lasers; the synchronization control signal is used to synchronously trigger the wavelength switching of the tunable lasers of different nodes. The management information is transmitted through a low-bitrate management channel constructed by the tone-top technology. After the control main board at the sending end receives the management information, it loads the low-bitrate management information into the optical signal through tone-top methods such as single-carrier amplitude modulation, multi-carrier amplitude modulation, or frequency modulation; after fiber transmission, the management information in the optical signal can be demodulated by the receiving circuit at the receiving end to obtain a low-bitrate management signal separated from the high-bitrate data, and the low-bitrate management signal is sent to the receiving-end control main board for processing after denoising and amplification.

[0061] In this example, the data transmission method between the nodes of the distributed optical switching system is as follows:

[0062] The optical signal transceiver switching unit of the sending-end node obtains one or more groups of management information and data to be transmitted sent by the host computer;

[0063] The control main board of the optical signal transceiver switching unit determines the wavelength of the signal emitted by the tunable laser in the corresponding optical transmitting unit according to the management information, and loads the wavelength routing information of the remote node into the low-bitrate management signal through tone-top methods such as single-carrier amplitude modulation, multi-carrier amplitude modulation, or frequency modulation.

[0064] The optical signal with the specified wavelength emitted by the optical transmitting unit is transmitted to the corresponding internal input / output optical port on the cyclic addressing arrayed waveguide grating router, and after passing through the cyclic addressing arrayed waveguide grating router, it is output from the specified external input / output optical port on the other side of the cyclic addressing arrayed waveguide grating router; when multiple groups of data are transmitted to the same sending-end node at the same time, the cyclic addressing arrayed waveguide grating router couples optical signals with multiple different wavelengths to the same external input / output optical port for output;

[0065] The optical signal sent by the sending-end node through the cyclic addressing arrayed waveguide grating router on its optical signal transceiver switching unit is directly transmitted to the corresponding receiving-end node through the corresponding optical fiber;

[0066] The external input / output optical ports of the cyclic addressing arrayed waveguide grating router in the receiving end node receive the optical signals transmitted by the optical fiber, and separate multiple optical signals with different wavelengths from the received optical signals (such as multiple optical signals with different wavelengths are coupled in the received optical signals). The multiple optical signals with different wavelengths separated are respectively output from the multiple internal input / output optical ports of the cyclic addressing arrayed waveguide grating router. The optical receiving units corresponding to the internal input / output optical ports receive the optical signals output from the internal input / output optical ports and demodulate data information and management information therefrom;

[0067] The optical receiving unit in the receiving end node sends the demodulated data information and management information to the control main board, and the control main board uploads the data information to the host computer of the same node after confirming that the management information corresponds to this node.

[0068] The method for expanding the distributed optical switching system in this embodiment includes:

[0069] Connect at least one input / output optical port of the optical signal transceiver and switching unit in the newly added node to the input / output optical port of the optical signal transceiver and switching unit on at least one node in the existing distributed optical switching system through an optical fiber;

[0070] Update the direct and indirect connection relationships between each input / output optical port of the optical signal transceiver and switching unit in each node and the remaining nodes in the system, and store them.

[0071] Embodiment 2: As Figure 10 shown, the distributed optical switching system with a non-full connection structure form in this embodiment is basically the same as that in Embodiment 1, except that in this example, the nodes are not all directly interconnected, and there is a situation where some nodes can only be indirectly interconnected through another or several other nodes in the system.

[0072] The data transmission method between the nodes in the distributed optical switching system in this example is as follows:

[0073] A. When the sending end node and the receiving end node are directly interconnected, the data transmission method between the nodes is the same as the data transmission method in Embodiment 1;

[0074] B. When the sending end node and the receiving end node are only indirectly interconnected through another or several other nodes in the system, the data transmission method is as follows:

[0075] The optical signal transceiver and switching unit of the sending end node obtains one or more groups of management information and data to be transmitted sent by the host computer;

[0076] The control main board of the optical signal transceiver and switching unit determines the corresponding optical emission unit and the corresponding wavelength of the signal generated by it according to the management information, and controls the corresponding optical emission unit to emit a specified wavelength optical signal with the corresponding wavelength in combination with the corresponding data to be transmitted in the same group;

[0077] The specified wavelength optical signal emitted by the optical emission unit is transmitted to the corresponding internal input / output optical port on the cyclic addressing arrayed waveguide grating router, and the specified wavelength optical signal is output from the specified external input / output optical port on the other side of the cyclic addressing arrayed waveguide grating router after passing through the cyclic addressing arrayed waveguide grating router; when multiple groups of data are transmitted to the same sending end node at the same time, the cyclic addressing arrayed waveguide grating router couples optical signals with multiple different wavelengths to the same external input / output optical port for output;

[0078] The optical signal emitted by the sending end node through the cyclic addressing arrayed waveguide grating router on its optical signal transceiver and switching unit is transmitted to the next node (intermediate node) on the data transmission path through the corresponding optical fiber;

[0079] The optical signal transceiver and switching unit of the intermediate node demodulates the data information and management information from the optical signal sent by the previous node;

[0080] The control main board in the intermediate node determines the corresponding optical emission unit and the corresponding wavelength of the signal generated by it according to the management information, and controls the corresponding optical emission unit to emit a specified wavelength optical signal with the corresponding wavelength in combination with the data information;

[0081] The specified wavelength optical signal emitted by the corresponding optical emission unit in the intermediate node is transmitted to the corresponding internal input / output optical port on the cyclic addressing arrayed waveguide grating router, and the cyclic addressing arrayed waveguide grating router emits the specified wavelength optical signal received by the corresponding internal input / output optical port from the specified external input / output optical port on the other side;

[0082] The optical signal emitted by the intermediate node is transmitted to the next intermediate node (if any) or the corresponding receiving end node on the data transmission path through the optical fiber;

[0083] The external input / output optical port of the cyclic addressing arrayed waveguide grating router in the receiving end node receives the optical signal transmitted by the optical fiber, and separates multiple optical signals with different wavelengths from the received optical signal (if multiple optical signals with different wavelengths are coupled in the received optical signal), and the separated multiple optical signals with different wavelengths are respectively output from multiple internal input / output optical ports of the cyclic addressing arrayed waveguide grating router, and the optical receiving unit corresponding to the internal input / output optical port receives the optical signal output from the internal input / output optical port and demodulates the data information and management information from it;

[0084] In the receiving end node, the optical receiving unit sends the demodulated data information and management information to the control main board. After confirming that the management information corresponds to this node, the control main board uploads the data information to the host computer of the same node.

[0085] Embodiment 3: As Figure 11 shown, in this embodiment, the distributed optical switching system has a tree-like distribution. This distributed optical switching system is basically the same as that in Embodiment 2, except that the nodes in this embodiment are distributed in a tree-like manner, and the data of the server cluster (host computer) in the node is transmitted and received through the optical signal transceiver and switching unit interconnected with it.

[0086] Embodiment 4: This embodiment is basically the same as Embodiment 1, 2 or 3, except that in this example, the optical signal transceiver and switching unit 1 adopts a dual-fiber structure. The optical signal transceiver and switching unit 1 is composed of an NxN cyclic addressing arrayed waveguide grating router I 105, an NxN cyclic addressing arrayed waveguide grating router II 106, N optical transmitting units, N optical receiving units and a control main board 16.

[0087] In this example, the N optical ports on one side of the cyclic addressing arrayed waveguide grating router I are used as internal input optical ports 110, and the N optical ports on the other side are used as external output optical ports 107 and serve as the output optical ports of this optical signal transceiver and switching unit. The N optical transmitting units correspond one-to-one with the N internal input optical ports of the cyclic addressing arrayed waveguide grating router I, and the optical transmitting ports 109 of the optical transmitting units are connected to the corresponding internal input optical ports 110 on the cyclic addressing arrayed waveguide grating router I through optical fibers or waveguides 2.

[0088] In this embodiment, the N optical ports on one side of the cyclic addressing arrayed waveguide grating router II are used as internal output optical ports 112, and the N optical ports on the other side are used as external input optical ports 108 and serve as the input optical ports of this optical signal transceiver and switching unit. The N optical receiving units correspond one-to-one with the N internal output optical ports of the cyclic addressing arrayed waveguide grating router II, and the internal output optical ports 112 on the cyclic addressing arrayed waveguide grating router II are connected to the optical receiving ports 111 of the corresponding optical receiving units through optical fibers or waveguides 2.

[0089] In this example, the control main board 16 is electrically connected to both the N optical transmitting units and the N optical receiving units. The control main board 16 controls the corresponding optical transmitting units to emit specified wavelength optical signals with corresponding wavelengths according to the received management information, so that the specified wavelength optical signals emitted by the corresponding optical transmitting units are emitted from the specified external output optical ports on the other side of the cyclic addressing arrayed waveguide grating router I after passing through the cyclic addressing arrayed waveguide grating router I.

[0090] In the distributed optical switching system of this embodiment, the output optical ports of the optical signal transceiver and switching units on the nodes are directly connected to the input optical ports of the optical signal transceiver and switching units on any node in the system through optical fibers or indirectly through other nodes, and the input optical ports of the optical signal transceiver and switching units on the nodes are directly connected to the output optical ports of the optical signal transceiver and switching units on any node in the system through optical fibers or indirectly through other nodes.

[0091] The method for expanding the distributed optical switching system in this embodiment includes:

[0092] Connect at least one output optical port of the optical signal transceiver and switching unit in the newly added node to the input optical port of the optical signal transceiver and switching unit on the node in the existing distributed optical switching system through an optical fiber;

[0093] Connect at least one input optical port of the optical signal transceiver and switching unit in the newly added node to the output optical port of the optical signal transceiver and switching unit on the node in the existing distributed optical switching system through an optical fiber;

[0094] Update the direct and indirect connection relationships between each input and output optical port of the optical signal transceiver and switching unit in each node and the remaining nodes in the system.

[0095] The above embodiments are only used to explain the inventive concept of the present invention, rather than limiting the protection scope of the rights of the present invention. Any non-substantive modification made to the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. An optical signal transceiver and switching unit, characterized in that It has N input / output optical ports, and each optical port can transmit and receive optical signals simultaneously. The optical signal transceiver and switch unit includes: An N×N cyclic addressing arrayed waveguide grating router, with the N optical ports on one side serving as internal input / output optical ports, and the N optical ports on the other side serving as the input / output optical ports of the optical signal transceiver and switch unit; N tunable optical modules, interconnected with the N internal input / output optical ports of the cyclic addressing arrayed waveguide grating router one by one; the tunable optical module has an optical transmitting unit and an optical receiving unit. The optical transmitting unit can send optical signals containing data information and management information through the output optical ports of the cyclic addressing arrayed waveguide grating router, and the optical receiving unit can receive optical signals containing data information and management information sent by a remote node through the cyclic addressing arrayed waveguide grating router; A control main board, electrically connected to the N tunable optical modules, for controlling the corresponding tunable optical module to emit a specified wavelength optical signal with a corresponding wavelength according to the received management information, so that the specified wavelength optical signal emitted by the corresponding tunable optical module is emitted from a specified optical port on the other side after passing through the cyclic addressing arrayed waveguide grating router; The management information received by the control main board is sent by a host computer or obtained by demodulating the optical signal received by the optical receiving unit.

2. An optical signal transceiver and switching unit, characterized in that It has N output optical ports capable of emitting optical signals and N input optical ports capable of receiving optical signals. The optical signal transceiver and switch unit includes: An N×N cyclic addressing arrayed waveguide grating router Ⅰ, with the N optical ports on one side serving as internal input optical ports, and the N optical ports on the other side serving as the output optical ports of the optical signal transceiver and switch unit; N optical transmitting units, interconnected with the N internal input optical ports of the cyclic addressing arrayed waveguide grating router Ⅰ one by one, and the optical transmitting unit can send optical signals containing data information and management information to the cyclic addressing arrayed waveguide grating router Ⅰ; An N×N cyclic addressing arrayed waveguide grating router Ⅱ, with the N optical ports on one side serving as internal output optical ports, and the N optical ports on the other side serving as the input optical ports of the optical signal transceiver and switch unit; N optical receiving units, interconnected with the N internal output optical ports of the cyclic addressing arrayed waveguide grating router Ⅱ one by one, and the optical receiving unit can receive optical signals containing data information and management information output by the cyclic addressing arrayed waveguide grating router Ⅱ; A control main board, electrically connected to the N optical transmitting units and the N optical receiving units, for controlling the corresponding optical transmitting unit to emit a specified wavelength optical signal with a corresponding wavelength according to the received management information, so that the specified wavelength optical signal emitted by the corresponding optical transmitting unit is emitted from a specified output optical port on the other side after passing through the cyclic addressing arrayed waveguide grating router Ⅰ; The management information received by the control main board is sent by a host computer or obtained by demodulating the optical signal received by the optical receiving unit.

3. The optical signal transceiver and switching unit according to claim 1 or 2, characterized in that: The management information is transmitted through a low-bitrate management channel constructed by the tone-topping technology; After the control main board of the transmitting-end optical signal transceiver and switch unit receives the management information, it loads the low-bitrate management information into the optical signal; After optical fiber transmission, the management information in the optical signal is demodulated by the optical receiving unit in the optical signal transceiver and switching unit at the receiving end into a low-bit-rate management signal separated from the high-bit-rate data information. The low-bit-rate management signal is sent to the control main board after denoising and amplification.

4. The optical signal transceiver and switching unit according to claim 3, characterized in that: The management information includes network status change information, wavelength switching information, and synchronization control signals.

5. The optical signal transceiver and switching unit according to claim 1 or 2, characterized in that: The optical transmitting unit consists of a tunable laser for transmitting optical signals and a driving circuit; the optical receiving unit consists of a detector for receiving optical signals and a receiving circuit.

6. A distributed optical switching system having a plurality of nodes, characterized in that: Nodes are directly interconnected via optical fibers or indirectly interconnected via optical fibers and nodes. Each node includes a server cluster or a host, and the optical signal transceiver and switching unit according to any one of claims 1 to 5; The server cluster or host is interconnected with the optical signal transceiver and switching unit in the same node. The server cluster or host sends and receives data through the optical signal transceiver and switching unit interconnected with it; The optical ports of the optical signal transceiver and switching unit in the node are directly connected via optical fibers to the corresponding optical ports of the optical signal transceiver and switching unit in another node in the system, or indirectly connected via one or more intermediate nodes to the corresponding optical ports of the optical signal transceiver and switching unit in another node in the system.

7. The distributed optical switching system according to claim 6, characterized in that: The control main board in the optical signal transceiver and switching unit of the sending end node obtains the data to be transmitted and management information sent by the server cluster or host in the same node; The control main board of the optical signal transceiver and switching unit determines the wavelength of the signal emitted by the tunable laser in the optical transmitting unit according to the management information, and controls the corresponding optical transmitting unit to emit an optical signal of a specified wavelength in combination with the data to be transmitted; The optical signal of the specified wavelength emitted by the optical transmitting unit is transmitted to the corresponding internal input optical port on the cyclic addressing arrayed waveguide grating router. The cyclic addressing arrayed waveguide grating router emits the optical signal of the specified wavelength received at the corresponding internal input optical port from the other side from the optical port corresponding to the management information; The optical signal emitted by the sending end node is directly transmitted via the corresponding optical fiber to the receiving end node corresponding to the management information directly connected to it, or transmitted via one or more intermediate nodes to the receiving end node corresponding to the management information indirectly connected to it; The control main board of the optical signal transceiver and switching unit of the receiving end node demodulates the data information and management information from the received optical signal, and uploads the data information to the server cluster or host in the same node after confirming that the management information corresponds to this node.

8. The distributed optical switching system according to claim 7, characterized in that: The optical signal transceiver and switching unit of the intermediate node demodulates the data information and management information from the optical signal sent by the previous node; The control main board determines the wavelength of the signal emitted by the tunable laser in the corresponding optical transmitting unit according to the management information, and controls the corresponding optical transmitting unit to emit an optical signal of a specified wavelength in combination with the data to be transmitted; The optical signal with a specified wavelength emitted by the optical emission unit is transmitted to the corresponding internal input end on the cyclic addressing arrayed waveguide grating router, and the cyclic addressing arrayed waveguide grating router emits the optical signal with the specified wavelength received at the corresponding internal input end from the optical port corresponding to the management information on the other side.

9. An expansion method for the distributed optical switching system according to any one of claims 6 to 8, which is used to add nodes to an existing distributed optical switching system, and is characterized in that: The output optical port of the optical signal transceiver and switching unit in the newly added node is connected to the input optical port of the optical signal transceiver and switching unit on the node in the existing distributed optical switching system through an optical fiber; The input optical port of the optical signal transceiver and switching unit in the newly added node is connected to the output optical port of the optical signal transceiver and switching unit on the node in the existing distributed optical switching system through an optical fiber; Update the direct and indirect connection relationships between each optical port of the optical signal transceiver and switching unit in each node and the remaining nodes in the system.

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