CN-121985242-A - Optical switching system and equipment

CN121985242ACN 121985242 ACN121985242 ACN 121985242ACN-121985242-A

Abstract

The application discloses an optical switching system and equipment, and relates to the technical field of optical communication. The system comprises a plurality of node access modules and a controller, wherein each node access module comprises an outer layer processing unit and an inner layer connecting unit. The outer layer processing unit connects the first port group of the inner layer connection unit in pairs, and the inner layer connection unit also forms an inner layer optical switching network based on the second port group with more ports through mesh topology interconnection. The outer layer processing units are externally connected with the input/output optical fibers, and the controller controls the outer layer processing units and the inner layer connecting units to construct a transmission light path of a target wavelength signal in a target transmission direction based on the control instruction. Based on the asymmetric design of the port number of the inner-layer connecting unit, the dimension of the exchange direction of the system is greatly improved. Meanwhile, based on the wavelength processing capability of the outer layer processing unit, the wavelength level scheduling of each optical fiber port is realized, and the contradiction between the total exchange capacity and flexible wavelength scheduling in the system is greatly reduced.

Inventors

Huang Linbojie
LIU ZICHEN
Dai longquan
LIN MIN
YAN SHIJIA
WU JUAN
WANG SHANGCHENG
HE ZHIXUE

Assignees

鹏城实验室

Dates

Publication Date: 20260505
Application Date: 20260119

Claims (10)

1. An optical switching system, the optical switching system comprising: A plurality of node access modules and a controller connected with each node access module; each node access module comprises an outer layer processing unit and an inner layer connecting unit; The first port group of the inner layer connecting unit is connected with the first interface group of the outer layer processing unit, the second port group of the inner layer connecting unit is connected with an inner layer optical switching network, and the inner layer optical switching network is formed by interconnecting the second port groups of all the inner layer connecting units through a mesh topology; The outer layer processing unit is connected with at least one input optical fiber and at least one output optical fiber through a second interface group and is used for connecting the input optical fiber or the output optical fiber to a corresponding port in a first port group of the inner layer connecting unit according to the wavelength of an optical signal; The controller is used for controlling each inner-layer connecting unit and each outer-layer processing unit to switch working states based on control instructions so as to construct a transmission light path for transmitting the optical signals with the target wavelength between the input optical fibers corresponding to the target transmission direction and the corresponding output optical fibers; wherein the number of ports of the first port group is not greater than the number of ports of the second port group.
2. The optical switching system of claim 1, wherein the external layer processing unit comprises at least one input wavelength selective switch and at least one output wavelength selective switch; the single-interface side of the input wavelength selective switch is connected with the input optical fiber, the single-interface side of the output wavelength selective switch is connected with the output optical fiber, the multi-interface side of the input wavelength selective switch and the multi-interface side of the output wavelength selective switch are connected with the first port group of the inner layer connecting unit, and the control end of the input wavelength selective switch and the control end of the output wavelength selective switch are connected to the controller; Or the outer layer processing unit comprises at least one wave combining structure and at least one wave dividing structure; the target wavelength optical signal comprises a multi-wavelength composite optical signal formed by coupling a plurality of different wavelengths; The multi-interface side of the wave-combining structure is connected with a plurality of output optical fibers, and the control end of the wave-combining structure and the control end of the wave-dividing structure are connected to the controller; the wave combining structure is used for coupling a plurality of single-wavelength optical signals with different wavelengths, which are input by each input optical fiber, into the multi-wavelength combined optical signal and transmitting the multi-wavelength combined optical signal to one port of the first port group of the inner-layer connecting unit; The branching structure is configured to branching the multi-wavelength synthesized optical signal transmitted by another port of the first port group of the inner layer connection unit into each single-wavelength signal light according to each wavelength, and output the single-wavelength signal light through a plurality of corresponding output optical fibers.
3. The optical switching system of claim 2, wherein the multiplexing structure comprises at least one multiplexing device; any one of interfaces of the multi-interface side of the wave combining device is connected with a corresponding input optical fiber, the single-interface side of the wave combining device is connected with a corresponding port in the first port group of the inner-layer connecting unit, and the control end of the wave combining device is connected with the controller; the branching structure comprises at least one branching device; any one of the interfaces of the multiple interfaces of the branching device is connected with a corresponding output optical fiber, the single interface of the branching device is connected with a corresponding port of the first port group of the inner layer connecting unit, and the control end of the branching device is connected with the controller.
4. The optical switching system of claim 3 wherein the multiplexing device and the demultiplexing device each comprise at least one of a wavelength selective switch, an arrayed waveguide grating, and a dielectric thin film filter.
5. The optical switching system of claim 4 wherein the wavelength selective switch, the input wavelength selective switch, and the output wavelength selective switch employ any one of a liquid crystal on silicon architecture and an integrated optical waveguide architecture.
6. The optical switching system according to claim 1, wherein the inner layer connection unit comprises an input matrix optical switch and an output matrix optical switch; The first port group of the input matrix optical switch and the first port group of the output matrix optical switch are connected with a first interface group corresponding to one outer layer processing unit, the second port group of the input matrix optical switch is respectively connected with the second port groups of the output matrix optical switches of other inner layer connecting units through the inner layer optical switching network, the second port group of the output matrix optical switch is respectively connected with the second port groups of the input matrix optical switches of other inner layer connecting units through the inner layer optical switching network, and the control end of the input matrix optical switch and the control end of the output matrix optical switch are both connected to the controller; or the inner layer connection unit comprises a shared matrix optical switch; The first port group corresponding to the input side of the shared matrix optical switch and the first port group corresponding to the output side of the shared matrix optical switch correspond to the first interface group of one outer layer processing unit, the second port group corresponding to the input side of the shared matrix optical switch is respectively connected with the second port groups corresponding to the output sides of the shared matrix optical switches of other inner layer connecting units through the inner layer optical switch network, the second port group corresponding to the output side of the shared matrix optical switch is respectively connected with the second port groups corresponding to the input sides of the shared matrix optical switches of other inner layer connecting units through the inner layer optical switch network, and the control end of the shared matrix optical switch is connected to the controller.
7. The optical switching system of claim 6 wherein the input matrix optical switch, the output matrix optical switch, and the common matrix optical switch are in any one of an integrated waveguide architecture, a MEMS architecture, a piezoceramic architecture, and a mechanical architecture.
8. The optical switching system according to claim 6, wherein when said inner connection unit comprises said common matrix optical switch, said inner connection unit further comprises a plurality of optical circulators; Each optical circulator is used for connecting each common matrix optical switch with each corresponding outer layer processing unit and/or connecting each common matrix optical switch with the inner layer optical switching network.
9. The optical switching system of claim 8 wherein each port of the first port group of the shared matrix optical switch is connected to a first end of a corresponding one of the optical circulators, the second end of the optical circulator is connected to a corresponding one of the input interfaces of the first interface group of the corresponding one of the outer processing units, and the third end of the optical circulator is connected to a corresponding one of the output interfaces of the first interface group of the corresponding one of the outer processing units when the shared matrix optical switches are connected to the corresponding one of the outer processing units by the optical circulators; When the optical circulators are connected with the optical switches of the shared matrix and the inner optical switching network, each port of the second port group of the optical switches of the shared matrix is connected with the first end of a corresponding optical circulator, the second end of the optical circulator is connected with the corresponding input port of the inner optical switching network, and the third end of the optical circulator is connected with the corresponding output port of the inner optical switching network.
10. An optical switching device, characterized in that it employs an optical switching system according to any one of claims 1 to 9.

Description

Optical switching system and equipment Technical Field The present application relates to the field of optical communications technologies, and in particular, to an optical switching system and an optical switching device. Background With the rising of emerging applications such as artificial intelligence, ultra-large-scale data, supercomputer centers and the like, the capacity of an optical transmission network grows exponentially, the capacity of an optical switching node is expected to reach more than 10Pb/s, and the use of a space division multiplexing network enables the number of optical fibers of the optical switching node to reach hundreds. The optical switching (Optical Cross Connect, OXC) device plays a vital role in the optical transport network, and can perform port-level switching connection and wavelength-level routing on optical signals, so as to realize flexible scheduling of large-capacity optical signals. Currently, in an optical switching node, a scheme of forming an upper and lower layered architecture by adopting a spatial dimension n×n matrix optical switch and a wavelength selective switch (WAVELENGTH SELECTIVE SWITCH, WSS) with a wavelength dimension 1×m is generally adopted, so that the number of optical fiber dimensions supported by the optical switching node can be increased to hundreds at most. However, the spatial dimension and the wavelength dimension of the architecture are in a top-bottom layer relationship, and the capacity of the wavelength-level routing scheduling of the optical signals is completely determined by the number of WSS ports, which results in that only part of the optical signals of the node can realize the wavelength-level routing scheduling Disclosure of Invention The application mainly aims to provide an optical switching system and equipment, which aim to solve the technical problem of how to reduce the contradiction between the total switching capacity and flexible wavelength scheduling in the optical switching system. To achieve the above object, an embodiment of the present application provides an optical switching system, including: A plurality of node access modules and a controller connected with each node access module; each node access module comprises an outer layer processing unit and an inner layer connecting unit; The first port group of the inner layer connecting unit is connected with the first interface group of the outer layer processing unit, the second port group of the inner layer connecting unit is connected with an inner layer optical switching network, and the inner layer optical switching network is formed by interconnecting the second port groups of all the inner layer connecting units through a mesh topology; The outer layer processing unit is connected with at least one input optical fiber and at least one output optical fiber through a second interface group and is used for connecting the input optical fiber or the output optical fiber to a corresponding port in a first port group of the inner layer connecting unit according to the wavelength of an optical signal; The controller is used for controlling each inner-layer connecting unit and each outer-layer processing unit to switch working states based on control instructions so as to construct a transmission light path for transmitting the optical signals with the target wavelength between the input optical fibers corresponding to the target transmission direction and the corresponding output optical fibers; wherein the number of ports of the first port group is not greater than the number of ports of the second port group. In one embodiment, the outer layer processing unit comprises at least one input wavelength selective switch and at least one output wavelength selective switch; the single-interface side of the input wavelength selective switch is connected with the input optical fiber, the single-interface side of the output wavelength selective switch is connected with the output optical fiber, the multi-interface side of the input wavelength selective switch and the multi-interface side of the output wavelength selective switch are connected with the first port group of the inner layer connecting unit, and the control end of the input wavelength selective switch and the control end of the output wavelength selective switch are connected to the controller; Or the outer layer processing unit comprises at least one wave combining structure and at least one wave dividing structure; the target wavelength optical signal comprises a multi-wavelength composite optical signal formed by coupling a plurality of different wavelengths; The multi-interface side of the wave-combining structure is connected with a plurality of output optical fibers, and the control end of the wave-combining structure and the control end of the wave-dividing structure are connected to the controller; the wave combining structure is used for coupling a plurality of single-wavelength optical signals with diff