Wavelength selection device and method

Abstract

The invention provides a wavelength selection device and method, and relates to the technical field of transmission and bearing, and the device comprises M input ports which are used for receiving K groups of optical signals from K directions, M and K are integers greater than 0, and K is smaller than or equal to M; the wave division unit is used for carrying out wave division processing on the K groups of optical signals; the first wavelength processing unit is used for carrying out first phase adjustment on the optical signal subjected to wave division processing; the second wavelength processing unit is used for performing second phase adjustment on the optical signal after the first phase adjustment; the wave combining unit is used for carrying out wave combining processing on the optical signals after the second phase adjustment to obtain T groups of optical signals; and the N output ports are used for outputting the T groups of optical signals, N and T are integers greater than 0, and T is less than or equal to N. According to the embodiment of the invention, the optical signals with different wavelengths from different directions can be subjected to phase adjustment through the two stages of wavelength processing units and then recombined to a lower path, so that the light utilization rate can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission and bearer, and in particular to a wavelength selection device and method. BACKGROUND

[0002] In view of the demand of computing power network for optical network, a new full optical network technology architecture based on 400G+ optical cross-connect (OXC) emerges as the times require, wherein the full optical switching node is a key subsystem of the new full optical network of computing network integration, and the OXC is a core component thereof.

[0003] A typical OXC scheme is an M*N OXC scheme, which is composed of M 1*N wavelength selective switches (WSSs) and N 1*M optical switches. Each WSS realizes grouping of signals coming from a certain direction and outputs the signals through different WSS output ports. The optical switch realizes selection of one signal from M optical signals output by the M WSSs. Since the optical switch can only select a single direction of optical signal for drop, the wavelength utilization rate is low. SUMMARY

[0004] Embodiments of the present application provide a wavelength selection device and method to solve the problem of low wavelength utilization rate.

[0005] To solve the above technical problems, the present application is implemented as follows:

[0006] In a first aspect, the embodiments of the present application provide a wavelength selection device, which comprises:

[0007] M input ports, configured to receive K groups of optical signals from K directions, M and K are integers greater than 0, and K≤M;

[0008] A splitting unit, configured to perform wave splitting processing on the K groups of optical signals;

[0009] A first wavelength processing unit, configured to perform first phase adjustment on the wave-splitting-processed optical signals;

[0010] A second wavelength processing unit, configured to perform second phase adjustment on the first phase-adjusted optical signals;

[0011] A combining unit, configured to perform wave combining processing on the second phase-adjusted optical signals to obtain T groups of optical signals;

[0012] N output ports, configured to output the T groups of optical signals, wherein N and T are integers greater than 0, and T≤N.

[0013] Optionally, the demultiplexing unit is a first grating.

[0014] The first grating is configured to demultiplex the K groups of optical signals according to wavelengths, and the K groups of demultiplexed optical signals are transmitted to KxP regions of the first wavelength processing unit, where P is an integer greater than 0.

[0015] Optionally, the first wavelength processing unit is a first liquid crystal on silicon (LCoS), and the second wavelength processing unit is a second LCoS.

[0016] The first LCoS is configured to perform first phase adjustment on a first group of optical signals in the KxP regions, the first group of optical signals generates corresponding exit angles for optical signals of different wavelengths after the first phase adjustment and is transmitted to KxP regions of the second LCoS, and the first group of optical signals includes KxP groups of optical signals corresponding to the KxP regions of the first LCoS.

[0017] The second LCoS is configured to perform second phase adjustment on a second group of optical signals, the second group of optical signals generates corresponding exit angles for optical signals of different wavelengths after the second phase adjustment and is transmitted to T regions of the multiplexing unit, and the second group of optical signals includes KxP groups of optical signals corresponding to the KxP regions of the second LCoS.

[0018] Optionally, the multiplexing unit is a second grating.

[0019] The second grating is configured to perform multiplexing on optical signals in each of the T regions to obtain the T groups of optical signals.

[0020] Optionally, the first LCoS includes a first control unit and a first circuit unit, the first circuit unit is configured to control a first voltage value of a chip of the KxP regions according to a first control instruction sent by the first control unit, and the first voltage value is used to drive adjustment of phases of KxP groups of optical signals of the first LCoS; and / or.

[0021] The second LCoS includes a second control unit and a second circuit unit, the second circuit unit is configured to control a second voltage value of a chip of the KxP regions according to a second control instruction sent by the second control unit, and the second voltage value is used to drive adjustment of phases of KxP groups of optical signals of the second LCoS.

[0022] Optionally, the first wavelength processing unit and the second wavelength processing unit are configured to converge optical signals in the same wavelength range to the same region of the multiplexing unit based on the demultiplexed optical signals.

[0023] Optionally, the apparatus further comprises a first amplifier disposed between the M input ports and the splitting unit; and / or,

[0024] The apparatus further comprises a second amplifier disposed between the combining unit and the N output ports.

[0025] In a second aspect, an embodiment of the present application provides a wavelength selection method applied to the wavelength selection apparatus of the first aspect, and the method comprises:

[0026] performing wavelength splitting processing on K groups of optical signals input into the M input ports by the splitting unit, M and K being integers greater than 0, and K≤M;

[0027] performing first phase adjustment on the wavelength-splitting-processed optical signals by the first wavelength processing unit;

[0028] performing second phase adjustment on the first-phase-adjusted optical signals by the second wavelength processing unit;

[0029] performing combining processing on the second-phase-adjusted optical signals by the combining unit, and outputting T groups of optical signals through N output ports, wherein N and T are integers greater than 0, and T≤N.

[0030] Optionally, the first wavelength processing unit is a first LCoS, and the second wavelength processing unit is a second LCoS;

[0031] The first phase adjustment on the wavelength-splitting-processed optical signals by the first wavelength processing unit comprises:

[0032] performing first phase adjustment on a first group of optical signals processed by the splitting unit by the first LCoS, wherein the first group of optical signals, after the first phase adjustment, produces corresponding exit angles for optical signals of different wavelengths and is respectively transmitted to K×P regions of the second LCoS, the first group of optical signals comprising K×P groups of optical signals corresponding to K×P regions of the first LCoS, and P is an integer greater than 0;

[0033] The second phase adjustment on the first-phase-adjusted optical signals by the second wavelength processing unit comprises:

[0034] performing second phase adjustment on a second group of optical signals by the second LCoS, wherein the second group of optical signals, after the second phase adjustment, produces corresponding exit angles for optical signals of different wavelengths and is respectively transmitted to T regions of the combining unit, the second group of optical signals comprising K×P groups of optical signals corresponding to K×P regions of the second LCoS.

[0035] Optionally, the wavelength division unit is a first grating, and the wavelength combination unit is a second grating; the wavelength division processing of the K groups of optical signals by the wavelength division unit includes:

[0036] The K groups of optical signals are processed by wavelength division using the first grating to obtain the K×P groups of optical signals.

[0037] The process of performing multiplexing on the phase-adjusted optical signal via a multiplexing unit includes:

[0038] The second grating is used to perform multiplexing of the second optical signal groups in the T regions to obtain the T groups of optical signals.

[0039] In this embodiment, a wavelength division unit divides optical signals of different wavelengths from different directions into wavelengths, and a two-stage wavelength processing unit can reassemble the optical signals of different wavelengths from different directions after phase adjustment, thereby improving light utilization. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of an all-optical network technology architecture based on 400G+OXC provided in an embodiment of this application;

[0042] Figure 2 This is a schematic diagram of an OXC architecture provided in an embodiment of this application;

[0043] Figure 3 This is a schematic diagram of an M*N OXC scheme architecture provided in an embodiment of this application;

[0044] Figure 4 This is a schematic diagram of a WSS core device provided in an embodiment of this application;

[0045] Figure 5 This is a schematic diagram of the structure of a wavelength selection device provided in an embodiment of this application;

[0046] Figure 6 This is a flowchart of a wavelength selection method provided in an embodiment of this application. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In typical computing network scenarios, optical transport networks face high demands for ultra-high bandwidth, ultra-long distance, and ultra-low latency. Optical networks need to be transformed and upgraded to build an optical foundation to support computing power. Based on these requirements, a new all-optical network architecture based on 400G+OXC is constructed to create a three-level latency circle, such as... Figure 1 As shown in the figure. Among them, OXC, as the core component, has a typical architecture as follows: Figure 2 As shown.

[0049] For OXC, a typical technical solution is to adopt an M*N OXC architecture. This solution consists of M 1*N WSSs and N 1*M optical switches, such as... Figure 3 As shown. Each optical switch can only select one WSS. For example, for the light received by beam 1 and beam M, each optical switch can only select one for wavelength division at any given time.

[0050] To account for the recombination and downlinking between arbitrary WSS output wavelengths, one approach is to replace the optical switch with a WSS, employing a first-stage M 1*N WSS and a second-stage N 1*M WSS. Each 1*N or 1*M WSS's core component consists of two gratings and one LCoS, as shown below. Figure 4 As shown. Therefore, replacing the optical switch with only WSS will significantly increase the number of WSSs, which in turn increases the number of core components such as gratings and LCoS. This approach leads to a substantial increase in cost, and the large number of discrete components also causes issues with the size and integration of the WSS board.

[0051] The wavelength selection method and apparatus of this application are based on a two-stage LCoS to achieve M*N OXC. Compared with the above schemes, both stages of LCoS have wavelength-level processing capabilities, overcoming the problem that the M*N scheme using WSS + optical switch cannot achieve recombination between wavelengths from different directions. At the same time, it does not require cascading two stages of a total of M+N WSSs. The same function is achieved within a single WSS by two stages of LCoS, which greatly simplifies the system architecture and reduces system complexity and cost.

[0052] See Figure 1 , Figure 1 This application provides a wavelength selection device, which includes:

[0053] M input ports 1 are used to receive K groups of optical signals from K directions, where M and K are both integers greater than 0, and K ≤ M;

[0054] Wavelength division unit 2 is used to perform wavelength division processing on the K groups of optical signals;

[0055] The first wavelength processing unit 3 is used to perform a first phase adjustment on the optical signal after wavelength division processing;

[0056] The second wavelength processing unit 4 is used to perform a second phase adjustment on the optical signal after the first phase adjustment.

[0057] The multiplexing unit 5 is used to perform multiplexing processing on the second phase-adjusted optical signal to obtain T groups of optical signals;

[0058] N output ports 6 are used to output the T groups of optical signals, where N and T are both integers greater than 0, and T≤N.

[0059] A schematic diagram of a wavelength selection device is shown below. Figure 5 As shown, the device mainly consists of M input ports 1, a wavelength division unit 2, a first wavelength processing unit 3, a second wavelength processing unit 4, a wavelength multiplexing unit 5, and N output ports 6.

[0060] Among them, the M input ports 1 are connected to K directions respectively, and the K groups of optical signals from the K directions are respectively input to the K input ports of the M input ports.

[0061] For example, when M=50, the 50 input ports can receive optical signals from 50 directions respectively, with each input port receiving an optical signal from one direction; or they can receive optical signals from only 30 (any integer less than 50) directions, which are then input into 30 of the 50 input ports respectively.

[0062] Wavelength division unit 2 is used to divide each input optical signal according to its wavelength. The wavelength division unit can be a device with wavelength division function, such as a grating, a thin film filter, an arrayed waveguide grating, etc.

[0063] For example, after the wavelength division unit divides the K groups of optical signals into K×80 wavelengths, the optical signals are input to the K×80 regions corresponding to the first wavelength processing unit.

[0064] The first wavelength processing unit 3 is used to perform phase adjustment on optical signals of different wavelength ranges in K×80 regions, so that at least a portion of the optical signals of different wavelength ranges from different input ports change their angles, thereby transmitting them to the region corresponding to the second wavelength processing unit. The first wavelength processing unit can be a device for adjusting the phase of optical signals according to the wavelength of the optical signals, such as a silicon-based liquid crystal, a liquid crystal spatial light modulator, an electro-optic phase modulator, etc.

[0065] The second wavelength processing unit 4 receives the optical signal processed by the first wavelength processing unit. By adjusting the phase of different regions (e.g., K×80 regions) of the second wavelength processing unit, the angle of optical signals from different input ports with different wavelength ranges is adjusted. The second wavelength processing unit further adjusts the angle based on the first wavelength processing unit, so that optical signals with different wavelength ranges are subsequently emitted to different output ports after passing through the second-stage grating, and optical signals from different input ports can be output from the same output port. The second wavelength processing unit can be a device for adjusting the phase of an optical signal according to its wavelength, such as a silicon-based liquid crystal, a liquid crystal spatial light modulator, or an electro-optic phase modulator.

[0066] The multiplexing unit 5 is used to multiplex the optical signals transmitted from each region by the second wavelength processing unit, thereby realizing the multiplexing of optical signals of different wavelengths to obtain T groups of optical signals.

[0067] The N output ports 6 are connected to T directions respectively. The optical signals processed by the multiplexing unit are output through T of the N output ports, where T≤N.

[0068] When it is necessary to combine optical signals of a specific wavelength band, the phase of the optical signal can be adjusted through a two-stage wavelength processing unit, thereby enabling the output of the optical signal of the specific wavelength band from the designated output port and realizing the recombination of optical signals of different wavelengths from different directions.

[0069] Optionally, in some embodiments, the wavelength division unit 2 is a first grating;

[0070] The first grating is used to perform wavelength division processing on the K groups of optical signals. The K groups of optical signals after wavelength division processing are respectively transmitted to K×P regions of the first wavelength processing unit 3, and the optical signal of each input port and the optical signal of each wavelength range correspond one-to-one with each region of the K×P regions, where P is an integer greater than 0.

[0071] Using the basic principle of gratings, optical signals can be divided according to wavelength. For example, if each group of optical signals is divided into P wavelengths, after dividing K groups of optical signals, a total of K×P wavelengths of optical signals can be obtained. These are then input into K×P regions of the first wavelength processing unit. The optical signal from each direction (each input port) and the optical signal of each wavelength range correspond one-to-one with each region. In other words, optical signals from different directions are located in different regions, and optical signals of different wavelength ranges are located in different regions.

[0072] Because gratings have high resolution, using gratings for wavelength division improves the effect of optical signal wavelength division.

[0073] The first wavelength processing unit 3 is a first silicon-based liquid crystal (LCoS), and the second wavelength processing unit 4 is a second LCoS.

[0074] The first LCoS is used to perform a first phase adjustment on the first optical signal group in the K×P regions, wherein the first optical signal group generates a corresponding emission angle for optical signals of different wavelengths after the first phase adjustment and is transmitted to the K×P regions of the second LCoS respectively, and the first optical signal group includes K×P groups of optical signals corresponding to the K×P regions of the first LCoS.

[0075] The second LCoS is used to perform a second phase adjustment on the second optical signal group, wherein the second optical signal group, after the second phase adjustment, generates corresponding emission angles for optical signals of different wavelengths and transmits them to the T regions of the multiplexing unit respectively, and the second optical signal group includes K×P groups of optical signals corresponding to the K×P regions of the second LCoS.

[0076] The two-stage wavelength processing units employ a first LCoS and a second LCoS, respectively.

[0077] After the first grating divides each group of optical signals into different wavelength bands, they are transmitted to K×P regions of the first LCoS. Each wavelength range and each input port corresponds one-to-one with each region. The first LCoS performs phase adjustment (i.e., first phase adjustment) on the optical signals in each region, changing the emission angle of the optical signals in at least some regions, thereby enabling the optical signals from the K×P regions of the first LCoS to be transmitted to the K×P regions of the second LCoS, as follows: Figure 5 As shown. The second LCoS further performs phase adjustment (i.e., second phase adjustment) on the optical signal of each region, so that the optical signal of each region is output to the designated region of the multiplexing unit, and the optical signals of the K×P regions of the second LCoS are output to the T regions of the multiplexing unit.

[0078] Through the above two-stage LCoS, the phase of optical signals of different bands can be adjusted, so that the phase-adjusted optical signals can be output to a designated area for multiplexing, thereby realizing the recombination of optical signals of different bands from different directions.

[0079] Optionally, the first LCoS includes a first control unit and a first circuit unit, the first circuit unit being configured to control a first voltage value of the chips in the K×P regions according to a first control command sent by the first control unit, the first voltage value being configured to drive adjustment of the phase of the K×P groups of optical signals of the first LCoS; and / or;

[0080] The second LCoS includes a second control unit and a second circuit unit. The second circuit unit is used to control the second voltage value of the chips in the K×P regions according to the second control command sent by the second control unit. The second voltage value is used to drive and adjust the phase of the K×P groups of optical signals of the second LCoS.

[0081] The first and second LCoS each include a control unit and a circuit unit. The control unit controls the voltage value of the chip in each region of the LCoS by sending control commands to the circuit unit, thereby achieving phase adjustment of the optical signal in that region.

[0082] Users can input commands to the control unit, which in turn outputs control commands to the circuit unit. The circuit unit then adjusts the voltage value according to the control commands output by the control unit. When it is necessary to adjust the output angle of the optical signal, commands can be input to the control unit for adjustment.

[0083] By adjusting the voltage values ​​of the two LCoS stages mentioned above, the phase of optical signals in different bands can be adjusted, thereby enabling the phase-adjusted optical signals to be output to a designated area.

[0084] Optionally, in some embodiments, the multiplexing unit 5 is a second grating;

[0085] The second grating is used to perform multiplexing processing on the optical signals of each of the T regions to obtain the T sets of optical signals.

[0086] like Figure 5 As shown, each region of the second grating combines the received optical signals of different wavelengths to obtain T sets of optical signals, which are then output through T output ports.

[0087] Optionally, in some embodiments, the first wavelength processing unit and the second wavelength processing unit are used to converge optical signals in the same wavelength range to the same region of the multiplexing unit based on the optical signals after wavelength division processing by the wavelength division unit.

[0088] The wavelength division unit divides each group of optical signals into multiple wavelength ranges. After two stages of LCoS, the optical signals of each wavelength range and the optical signals from each direction are phase-adjusted, so that the optical signals of each wavelength range and the optical signals from each direction are transmitted to the designated area of ​​the multiplexing unit. This enables the optical signals of the same wavelength range from different directions to converge to the same area of ​​the multiplexing unit and output through the output port.

[0089] Optionally, in some embodiments, the device further includes a first amplifier (not shown in the figure), the first amplifier being disposed between the M input ports 1 and the demultiplexing unit 2; and / or,

[0090] The device further includes a second amplifier, which is disposed between the multiplexing unit 5 and the N output ports 6.

[0091] An amplifier is included between the M input ports and the wavelength division unit. The amplifier amplifies the input optical signal, which can reduce the loss caused by optical signal propagation.

[0092] An amplifier is included between the multiplexing unit and the N input ports. The amplifier amplifies the output optical signal, which can reduce the loss caused by optical signal propagation.

[0093] See Figure 6 This application also provides a wavelength selection method applicable to any of the above-mentioned wavelength selection devices, the method comprising:

[0094] The wavelength division unit performs wavelength division processing on the K groups of optical signals input to the M input ports, where M and K are both integers greater than 0, and K ≤ M;

[0095] The first wavelength processing unit performs a first phase adjustment on the wavelength-division processed optical signal.

[0096] The second wavelength processing unit performs a second phase adjustment on the optical signal after the first phase adjustment.

[0097] The optical signal after phase adjustment is processed by a multiplexing unit, and T sets of optical signals are output through N output ports, where N and T are both integers greater than 0, and T≤N.

[0098] Optionally, the first wavelength processing unit is a first LCoS, and the second wavelength processing unit is a second LCoS;

[0099] The first phase adjustment of the wavelength-divided optical signal by the first wavelength processing unit includes:

[0100] The first optical signal group after wavelength division processing is subjected to a first phase adjustment by the first LCoS. After the first phase adjustment, the first optical signal group generates corresponding emission angles for optical signals of different wavelengths and transmits them to K×P regions of the second LCoS respectively. The first optical signal group includes K groups of optical signals that are wavelength divided by the wavelength division unit and then transmitted to K×P regions of the first LCoS corresponding to K×P groups of optical signals, where P is an integer greater than 0.

[0101] The second phase adjustment of the optical signal after the first phase adjustment by the second wavelength processing unit includes:

[0102] The second optical signal group is subjected to a second phase adjustment by the second LCoS. After the second phase adjustment, the second optical signal group generates corresponding emission angles for optical signals of different wavelengths and transmits them to the T regions of the multiplexing unit respectively. The second optical signal group includes K×P groups of optical signals corresponding to K×P regions of the second LCoS.

[0103] Optionally, the wavelength division unit is a first grating, and the wavelength combination unit is a second grating; the wavelength division processing of the K groups of optical signals input to the M input ports through the wavelength division unit includes:

[0104] The K groups of optical signals input to the M input ports are processed by wavelength division using the first grating to obtain the K×P groups of optical signals.

[0105] The process of performing multiplexing on the second phase-adjusted optical signal via a multiplexing unit includes:

[0106] The second grating is used to perform multiplexing of the second optical signal groups in the T regions to obtain the T groups of optical signals.

[0107] The implementation process of the above wavelength selection method can be found in the implementation steps of the corresponding wavelength selection device. To facilitate further understanding of the wavelength selection method of this application, specific implementation methods are provided below.

[0108] The wavelength selection method includes the following steps:

[0109] Step 1: Wavelengths from M directions are λ 11 ~λ 1x , λ 21 ~λ 2y 、…、λ M1 ~λ Mz The optical signals are respectively input to the M input ports of the wavelength selection device. If there are only optical signals from K directions, they are respectively input to the K input ports of this device, where K ≤ M.

[0110] For example, the wavelength from direction 1 is λ 11 ~λ 1x The optical signal is input to the first input port of this device, and the wavelength from direction M is λ. M1 ~λ Mz The optical signal is input to the Mth input port of this device. The order here is for illustrative purposes only.

[0111] Step 2: The wavelengths from M directions are λ. 11 ~λ 1x , λ 21 ~λ 2y 、…、λ M1 ~λ Mz The optical signal, after passing through the M input ports of the wavelength selection device, enters the device and is first transmitted to the first grating. The first grating selects wavelengths λ from the M input ports respectively. 11 ~λ 1x , λ 21 ~λ 2y 、…、λ M1 ~λ Mz The optical signals are processed uniformly, and the same set of optical signals of different wavelengths transmitted to the first grating from each input port are processed by wavelength division, so that the optical signals of different wavelengths are generated at different transmission angles in space.

[0112] For example, the wavelength from input port 1 is λ 11 ~λ 1x After the optical signal is processed by the first grating wavelength division, each wavelength generates a different phase, which in turn generates a different transmission angle in space, i.e., λ. 11 ~λ 1x It was separated in space.

[0113] Step 3: The wavelengths from M directions are λ 11 ~λ 1x , λ 21 ~λ 2y 、…、λ M1 ~λ Mz The optical signal, after passing through the first grating, generates different transmission angles in space, achieving spatial separation of each wavelength from each direction, and thus transmitting it to different regions of the first LCoS. That is, each wavelength in each direction has its own corresponding region on the first LCoS. Therefore, by adjusting the phase of each corresponding region of the first LCoS, the angle of each wavelength in each direction can be independently adjusted, enabling optical signals of different wavelengths from different input ports to be transmitted to a set of regions corresponding to the second-stage LCoS.

[0114] For example, the wavelength from input port 1 is λ11 ~λ 1x The optical signal, with a wavelength of λ, originates from input port M. M1 ~λ Mz The optical signal, after passing through the first grating, has a wavelength of λ. 11 ~λ 1x , λ M1 ~λ Mz The optical signals are transmitted to different regions of the first LCoS, and the first LCoS controls the λ. 11 ~λ 1x , λ M1 ~λ Mz Each wavelength in the input is independently phase-loaded, so that the wavelength from input port 1 is λ. 11 The optical signal, with a wavelength of λ, originates from input port M. M1 The optical signal, after being angled by the first LCoS, is transmitted to the first group of regions corresponding to the second LCoS. The wavelength from input port 1 is λ. 1x The optical signal, with a wavelength of λ, originates from input port M. Mz The optical signal is transmitted to the x-th group region corresponding to the second LCoS after the angle is adjusted by the first LCoS.

[0115] Step 4: After the optical signals of different wavelengths from different input ports are transmitted to the corresponding groups of regions of the second-stage LCoS, the phase of the different wavelengths in different regions of the second LCoS is adjusted so that the wavelengths corresponding to each group of regions are transmitted through space to the region corresponding to the second grating, and then after being combined by the second-stage grating, they are emitted to N different output ports.

[0116] For example, the wavelength from input port 1 is λ 11 The optical signal, from the input port M with a wavelength of λ M1 The optical signal is transmitted to the first group of regions corresponding to the second LCoS after the first LCoS adjusts the angle. The second LCoS further applies a phase adjustment angle so that the wavelength from input port 1 is λ. 11 The optical signal, with a wavelength of λ, originates from input port M. M1 The optical signal is transmitted through space to the first group of regions corresponding to the second grating, and after being combined by the second-stage grating, it is emitted to output port 1; while the wavelength from input port 1 is λ. 1x The optical signal, with a wavelength of λ, originates from input port M. Mz The optical signal is transmitted to the x-th region corresponding to the second LCoS after the first LCoS adjusts the angle. The second LCoS further applies a phase adjustment angle, so that the wavelength from input port 1 is λ. 1x The optical signal, from the input port M with a wavelength of λ MzThe optical signal is transmitted through space to the x-th group region corresponding to the second grating, and after being combined by the second-level grating, it is emitted to the output port x.

[0117] Therefore, the reconfiguration and scheduling of wavelengths from different directions is realized, that is, wavelengths from M directions are respectively λ 11 ~λ 1x , λ 21 ~λ 2y 、…、λ M1 ~λ Mz The optical signal is input to one of the M input ports of the wavelength selection device, respectively. After passing through this device, the wavelength from direction 1 is λ. 11 The optical signal originates from direction M and has a wavelength of λ. M1 The optical signal is output from output port 1, and the wavelength is λ from direction 1. 1x The optical signal originates from direction M and has a wavelength of λ. Mz The optical signal is output from output port x.

[0118] The wavelength selection device and method of this application realizes M*N OXC based on two-stage LCoS. Both stages of LCoS have wavelength-level processing capabilities, which overcomes the problem that the M*N scheme using WSS + optical switch cannot achieve recombination of wavelengths from different directions. At the same time, it does not require cascading two stages of a total of M+N WSSs. The same function is achieved within a single WSS by two stages of LCoS, which greatly simplifies the system architecture, reduces system complexity and cost, and has the potential for lower latency and flexible scheduling in computing networks.

[0119] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0120] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0121] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A wavelength selection device, characterized in that, The device includes: M input ports are used to receive K groups of optical signals from K directions, where M and K are both integers greater than 0, and K ≤ M; Wavelength division unit, used for wavelength division processing of the K groups of optical signals; The first wavelength processing unit is used to perform the first phase adjustment on the optical signal after wavelength division processing; The second wavelength processing unit is used to perform a second phase adjustment on the optical signal after the first phase adjustment. The multiplexing unit is used to perform multiplexing processing on the second phase-adjusted optical signal to obtain T groups of optical signals; N output ports are used to output the T groups of optical signals, where N and T are both integers greater than 0, and T≤N.

2. The apparatus according to claim 1, characterized in that, The wavelength division unit is a first grating; The first grating is used to perform wavelength division processing on the K groups of optical signals, wherein the K groups of optical signals after wavelength division processing are respectively transmitted to K×P regions of the first wavelength processing unit, where P is an integer greater than 0.

3. The apparatus according to claim 2, characterized in that, The first wavelength processing unit is a first silicon-based liquid crystal (LCoS), and the second wavelength processing unit is a second LCoS. The first LCoS is used to perform a first phase adjustment on the first optical signal group in the K×P regions, wherein the first optical signal group generates a corresponding emission angle for optical signals of different wavelengths after the first phase adjustment and is transmitted to the K×P regions of the second LCoS respectively, and the first optical signal group includes K×P groups of optical signals corresponding to the K×P regions of the first LCoS. The second LCoS is used to perform a second phase adjustment on the second optical signal group, wherein the second optical signal group, after the second phase adjustment, generates corresponding emission angles for optical signals of different wavelengths and transmits them to the T regions of the multiplexing unit respectively, and the second optical signal group includes K×P groups of optical signals corresponding to the K×P regions of the second LCoS.

4. The apparatus according to claim 3, characterized in that, The wave combiner unit is a second grating; The second grating is used to perform multiplexing processing on the optical signals of each of the T regions to obtain the T sets of optical signals.

5. The apparatus according to claim 3, characterized in that, The first LCoS includes a first control unit and a first circuit unit. The first circuit unit is used to control the first voltage value of the chips in the K×P regions according to the first control command sent by the first control unit. The first voltage value is used to drive and adjust the phase of the K×P groups of optical signals of the first LCoS. and / or; The second LCoS includes a second control unit and a second circuit unit. The second circuit unit is used to control the second voltage value of the chips in the K×P regions according to the second control command sent by the second control unit. The second voltage value is used to drive and adjust the phase of the K×P groups of optical signals of the second LCoS.

6. The apparatus according to claim 1, characterized in that, The first wavelength processing unit and the second wavelength processing unit are used to converge optical signals within the same wavelength range to the same region of the multiplexing unit based on the optical signals after wavelength division processing by the wavelength division unit.

7. The apparatus according to claim 1, characterized in that, The device further includes a first amplifier disposed between the M input ports and the demultiplexing unit; and / or, The device further includes a second amplifier disposed between the multiplexing unit and the N output ports.

8. A wavelength selection method, applied to the wavelength selection device according to any one of claims 1 to 7, characterized in that, include: The wavelength division unit performs wavelength division processing on the K groups of optical signals input to the M input ports, where M and K are both integers greater than 0, and K ≤ M; The first wavelength processing unit performs a first phase adjustment on the wavelength-division processed optical signal. The second wavelength processing unit performs a second phase adjustment on the optical signal after the first phase adjustment. The optical signal after phase adjustment is processed by a multiplexing unit, and T sets of optical signals are output through N output ports, where N and T are both integers greater than 0, and T≤N.

9. The method according to claim 8, characterized in that, The first wavelength processing unit is a first LCoS, and the second wavelength processing unit is a second LCoS; The first phase adjustment of the wavelength-divided optical signal by the first wavelength processing unit includes: The first optical signal group after wavelength division processing is subjected to a first phase adjustment by the first LCoS. After the first phase adjustment, the first optical signal group generates corresponding emission angles for optical signals of different wavelengths and transmits them to K×P regions of the second LCoS respectively. The first optical signal group includes K groups of optical signals that are wavelength divided by the wavelength division unit and then transmitted to K×P regions of the first LCoS corresponding to K×P groups of optical signals, where P is an integer greater than 0. The second phase adjustment of the optical signal after the first phase adjustment by the second wavelength processing unit includes: The second optical signal group is subjected to a second phase adjustment by the second LCoS. After the second phase adjustment, the second optical signal group generates corresponding emission angles for optical signals of different wavelengths and transmits them to the T regions of the multiplexing unit respectively. The second optical signal group includes K×P groups of optical signals corresponding to K×P regions of the second LCoS.

10. The method according to claim 9, characterized in that, The wavelength division unit is a first grating, and the wavelength combination unit is a second grating; the wavelength division processing of the K groups of optical signals input to the M input ports through the wavelength division unit includes: The K groups of optical signals input to the M input ports are processed by wavelength division using the first grating to obtain the K×P groups of optical signals. The process of performing multiplexing on the second phase-adjusted optical signal via a multiplexing unit includes: The second grating is used to perform multiplexing of the second optical signal groups in the T regions to obtain the T groups of optical signals.

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