WO2024027416A1

WO2024027416A1 - Optical device, reconfigurable optical add-drop multiplexer, and signal monitoring method

Info

Publication number: WO2024027416A1
Application number: PCT/CN2023/104787
Authority: WO
Inventors: 段玉华; 李健雄; 邓宁
Original assignee: 华为技术有限公司
Priority date: 2022-07-30
Filing date: 2023-06-30
Publication date: 2024-02-08
Also published as: CN117527130A

Abstract

An optical device, a reconfigurable optical add-drop multiplexer, and a signal monitoring method. A first optical switching engine transmits a first WDM signal to a first area in a second optical switching engine by means of a dispersive system at a first moment, and rotates at a second moment such that a second WDM signal is transmitted to a second area in the second optical switching engine by means of the dispersive system. The second optical switching engine can modulate a pattern by means of a fixed optical field, transmit an optical signal of a first wavelength in the first WDM signal from the dispersive system to a photodetector at the first moment, and transmit an optical signal of a second wavelength in the second WDM signal from the dispersive system to the photodetector at the second moment. In this way, the wavelength of an optical signal transmitted to the photodetector can be quickly adjusted by rotating the first optical switching engine, thereby accelerating the speed of WDM signal monitoring.

Description

Optical equipment, reconfigurable optical branch multiplexer and signal monitoring method

This application is required to be submitted to the State Intellectual Property Office of China on July 30, 2022, with the application number 202210912569. claim of priority, the entire contents of which are incorporated herein by reference.

Technical field

The present application relates to the field of network communication technology, and in particular to an optical device, a reconfigurable optical branch multiplexer and a signal monitoring method.

Background technique

In a wavelength-division multiplex (WDM) network, a WDM signal may include multiple optical signals with different wavelengths. During the transmission process, optical signals of different wavelengths may undergo different changes when passing through various components in the link. For example, the power of optical signals of different wavelengths may change differently due to the uneven gain spectrum of the optical amplifier, stimulated Raman scattering in the transmission fiber, etc., thus causing power imbalance between channels of different wavelengths. For another example, wavelengths are uploaded and downloaded when the WDM signal passes through the optical switching node, or due to fiber breakage or equipment failure in the communication link, some wavelength channels in the WDM signal are missing, which in turn leads to the loss of the WDM signal. The spectral shape is not flat.

In order to effectively control and manage the wavelength division multiplexing network, it is necessary to monitor the optical signals of each wavelength in the WDM signal. Currently, monitoring functions can be integrated into existing devices in optical networks such as wavelength selective switches (WSS). Specifically, the control algorithm can be implemented on the optical switching engine of the WSS to separate a part of the power from the service light as the monitoring light, and output the optical signals of different wavelengths in the monitoring light to the monitoring port at different times, thereby achieving control. Monitoring of optical signals of different wavelengths in WDM signals.

However, the optical switching engine in WSS is usually a liquid crystal on silicon (LCOS) spatial light modulator, whose response time is usually around 100 milliseconds (ms). Therefore, when the optical switching engine sequentially outputs optical signals of different wavelengths to the monitoring port in a time-shared manner for monitoring WDM signals, the monitoring speed is very slow.

Contents of the invention

This application provides an optical device, a reconfigurable optical split multiplexer and a signal monitoring method to improve the speed of monitoring WDM signals.

In a first aspect, embodiments of the present application provide an optical device, including: an optical system, a first optical switching engine, a dispersion system, a second optical switching engine, and a first optical detector.

Among them, the optical system can be used to acquire different WDM signals belonging to the same optical signal at different times. Specifically, the optical system can be used to acquire the first WDM signal at the first moment and incident the first WDM signal into the first optical switching engine; acquire the second WDM signal at the second moment and incident the second WDM signal into the first optical switching engine; An optical switching engine. The first WDM signal and the second WDM signal are different WDM signals belonging to the same optical signal, and both are monitoring signals including multiple wavelength optical signals.

The first optical switch engine can be used to inject WDM signals belonging to the same optical signal to the second optical switch at different times. on different areas of the engine. Specifically, the first optical switching engine is used to incident the first WDM signal from the optical system to the first area in the second optical switching engine through the dispersion system at the first moment; and to rotate at the second moment so that the signal from the optical system is The second WDM signal of the system is incident to the second area in the second optical switching engine through the dispersion system. The first area and the second area may be different areas along the first direction in the second optical switching engine.

Dispersion systems can be used to perform dispersion processing on WDM signals. For example, the dispersion system can be used to respectively incident the optical signals of each wavelength in the first WDM signal from the first optical switching engine to different areas along the second direction in the second optical switching engine at the first moment, and at the second moment The optical signals of each wavelength in the second WDM signal from the first optical switching engine are respectively incident on different areas along the second direction in the second optical switching engine. Wherein, the first direction and the second direction are perpendicular.

The second optical switching engine can be used to incident the optical signal of the first wavelength in the first WDM signal from the dispersion system to the first optical detector at the first moment through the fixed light field modulation pattern, and to incident the optical signal from the first WDM signal to the first optical detector at the second moment. The optical signal of the second wavelength in the second WDM signal of the dispersion system is incident on the first optical detector.

The first light detector can be used to detect the light signal incident on the first light detector. Specifically, the first photodetector can be used to detect the light signal of the first wavelength incident on the first photodetector at the first time, and to detect the light signal of the second wavelength incident on the first photodetector at the second time. signal is detected.

In this optical device, through the rotation of the first optical switching engine, different WDM signals in one optical signal can be incident on different areas on the second optical switching engine at different times, that is, the WDM signals in this optical signal Quickly scan the light spot position on the second optical switching engine; and, through the dispersion system, make the light of different wavelengths in each WDM signal in the optical signal incident on different areas on the second optical switching engine respectively; through The fixed light field modulation pattern on the second optical switching engine can cause an optical signal of one wavelength of one WDM signal in the optical signal to be incident on the first optical detector at each moment. In this way, the wavelength of the optical signal incident on the first optical detector can be quickly adjusted by rotating the first optical switching engine without updating the phase information on the second optical switching engine, thereby increasing the speed of monitoring WDM signals.

In the first possible design, the first optical switching engine is a MEMS device or a DLP device, which can achieve rapid rotation and thus increase the speed of monitoring WDM signals.

In a second possible design, the second optical switching engine can incident the optical signal into the optical detector through the first optical switching engine. Specifically, the second optical switching engine can be used to use the light field modulation pattern to incident the optical signal of the first wavelength in the first WDM signal from the dispersion system to the first optical switching engine at the first moment, and to transmit the optical signal from the dispersion system to the first optical switch engine at the second moment. The optical signal of the second wavelength in the second WDM signal of the dispersion system is incident on the first optical switching engine. The first optical switching engine may be used to incident the optical signal of the first wavelength from the second optical switching engine to the first optical detector at the first moment; and to transmit the light of the second wavelength from the second optical switching engine to the first optical detector at the second moment. The signal is incident on the first light detector. This design provides a possible way to inject the optical signal from the second optical switching engine into the first optical detector, and the implementation is relatively simple.

In a third possible design, a dispersive system can be implemented in one of the following ways:

Implementation Mode 1: The dispersion system may include: a first lens, a dispersion element and a second lens.

Wherein, the first lens can be used to amplify the light spot of the first WDM signal from the first optical switching engine at the first moment, and to amplify the light spot of the second WDM signal from the first optical switching engine at the second moment. .

Dispersive elements can perform dispersion processing on optical signals. Specifically, the dispersion element can be used to disperse the optical signals of each wavelength in the first WDM signal from the first lens to different directions at the first moment, and to disperse the optical signals of each wavelength in the second WDM signal from the first lens at the second moment. The optical signals are dispersed in different directions.

The second lens may be used to incident the optical signals of each wavelength in the first WDM signal from the dispersive element to different areas along the second direction in the second optical switching engine at the first moment, and to transmit the optical signals from the dispersive element at the second moment. The optical signals of each wavelength in the second WDM signal are incident on different areas along the second direction in the second optical switching engine.

Implementation Mode 2: The dispersion system may include: a dispersion element and a second lens.

Wherein, the dispersion element can be used to disperse the optical signals of each wavelength in the first WDM signal from the first optical switching engine to different directions at the first moment, and to disperse the second WDM signal from the first optical switching engine at the second moment. The optical signals of each wavelength are dispersed in different directions.

This design provides multiple implementation methods of the dispersion system and is relatively flexible.

In a fourth possible design, the dispersive element can be a grating, a prism, or a diffractive optical element DOE device. This design provides multiple implementation methods of dispersion elements, which is more flexible and easy to implement.

In a fifth possible design, the optical device can detect light signals through multiple light detectors. The following takes two light detectors as an example for explanation. The optical device may also include a second photodetector. At this time, the second optical switching engine can also be used to incident the optical signal of the third wavelength in the first WDM signal from the dispersion system to the second optical detector at the first moment through the light field modulation pattern, and at the second moment The optical signal of the fourth wavelength in the second WDM signal from the dispersion system is incident on the second photodetector. The second photodetector may be used to detect the optical signal of the third wavelength incident on the second photodetector at the first moment, and to detect the optical signal of the fourth wavelength incident on the second photodetector at the second moment. . Through this design, optical signals of multiple wavelengths can be detected at the same time, thereby further improving the speed of monitoring WDM signals.

In a sixth possible design, the second optical switching engine is a MEMS device, a liquid crystal on silicon LCOS device, a DOE device with a light field modulation pattern provided thereon, or a metasurface device with a light field modulation pattern provided thereon. This design provides multiple implementation methods of the second optical switching engine, which is more flexible and easy to implement.

In a seventh possible design, the optical system can also be used to acquire a third WDM signal and incident the third WDM signal into the dispersion system. Among them, the third WDM signal is a service signal.

The dispersion system may also be used to incident optical signals of various wavelengths in the third WDM signal from the optical system into different areas along the second direction in the second optical switching engine.

The second optical switching engine includes a first deflection layer and a second deflection layer. Wherein, a light field modulation pattern is provided on the first deflection layer, and the first deflection layer is used to adjust the transmission direction of the first WDM signal and the second WDM signal; the second deflection layer is used to adjust the transmission direction of the third WDM signal.

The second optical switching engine can be used to incident the optical signal of the first wavelength in the first WDM signal from the dispersion system to the first optical detector at the first moment through the light field modulation pattern on the first deflection layer, and at the second The optical signal of the second wavelength in the second WDM signal from the dispersion system is incident on the first optical detector at all times. Moreover, the second optical switching engine can also be used to inject the optical signals of each wavelength in the third WDM signal from the dispersion system to the corresponding output port through the second deflection layer.

Through this design, when multiple optical signals (for example, one optical signal including the first WDM signal and the second WDM signal, and another optical signal including the third WDM signal) are simultaneously transmitted in the optical device, the optical device The WDM signal in one optical signal (for example, one optical signal including the first WDM signal and the second WDM signal) can be quickly monitored without affecting other optical signals (for example, another optical signal including the third WDM signal). signal); in this way, the optical device can simultaneously realize WSS and spectral detection functions.

In an eighth possible design, the first WDM signal, the second WDM signal and the third WDM signal are all linearly polarized optical signals, and the polarization directions of the first WDM signal and the second WDM signal are all the first polarization direction, The polarization direction of the third WDM signal is the second polarization direction, and the first polarization direction and the second polarization direction are perpendicular; the third WDM signal includes a fourth WDM signal and a fifth WDM signal.

The optical device also includes: a polarization beam combiner.

The optical system can be used to acquire the fourth WDM signal at the first moment and incident the fourth WDM signal into the polarization beam combiner; acquire the fifth WDM signal at the second moment and incident the fifth WDM signal into the polarization beam combiner.

The first optical switching engine may be used to incident the first WDM signal from the optical system sequentially through the polarization beam combiner and the dispersion system into the first area in the second optical switching engine at the first moment; and perform rotation at the second moment, The second WDM signal from the optical system is sequentially incident on the second area in the second optical switching engine through the polarization beam combiner and the dispersion system.

The polarization beam combiner can be used to synthesize the first WDM signal from the first optical switching engine and the fourth WDM signal from the optical system into a first optical signal at the first moment, and incident the first optical signal into the dispersion system ; At the second moment, synthesize the second WDM signal from the first optical switching engine and the fifth WDM signal from the optical system into a second optical signal, and incident the second optical signal into the dispersion system;

The dispersion system can be used to separately incident the optical signals of each wavelength of the WDM signal in the first optical signal from the polarization beam combiner into different areas along the second direction in the second optical switching engine at the first moment; at the second At all times, the optical signals of each wavelength of the WDM signal in the second optical signal from the polarization beam combiner are respectively incident on different areas along the second direction in the second optical switching engine.

The first deflection layer and the second deflection layer in the second optical switching engine may be stacked layers. The first deflection layer is used to adjust the transmission direction of the optical signal in the first polarization direction, and the second deflection layer is used to adjust the transmission direction of the optical signal in the second polarization direction.

In this design, the second optical switching engine may include a first deflection layer and a second deflection layer arranged in a stack. The first deflection layer and the second deflection layer may respectively adjust the transmission direction of the WDM signal with the first polarization direction and the The transmission direction of the WDM signal in the second polarization direction can reduce the size of the second optical switching engine, thereby reducing the space occupied by the optical equipment and reducing the cost of the optical equipment.

In a ninth possible design, the optical system may include: an input port, an optical splitter, a first polarization conversion unit and a second polarization conversion unit.

Wherein, the input port can be used to receive the sixth WDM signal at the first moment and incident the sixth WDM signal to the optical splitter; to receive the seventh WDM signal at the second moment and incident the seventh WDM signal to the optical splitter;

The optical splitter can be used to divide the sixth WDM signal from the input port into an eighth WDM signal and a ninth WDM signal at the first moment, and incident the eighth WDM signal to the first polarization conversion unit, and the ninth WDM signal to the a second polarization conversion unit; at the second moment, the seventh WDM signal from the input port is divided into a tenth WDM signal and an eleventh WDM signal, and the tenth WDM signal is incident on the first polarization conversion unit, and the eleventh WDM signal is The signal is incident on the second polarization conversion unit;

The first polarization conversion unit may be used to convert the polarization direction of the eighth WDM signal from the optical splitter to the first polarization direction at the first moment to obtain the first WDM signal; and to convert the tenth WDM signal from the optical splitter at the second moment. The polarization direction of the signal is converted to the first polarization direction to obtain the second WDM signal;

The second polarization conversion unit can be used to convert the polarization direction of the ninth WDM signal from the optical splitter to the second polarization direction at the first moment to obtain the fourth WDM signal; and to convert the eleventh WDM signal from the optical splitter at the second moment. The polarization direction of the WDM signal is converted to the second polarization direction to obtain a fifth WDM signal.

Through this design, the optical device can easily acquire the WDM signal with the first polarization direction and the WDM signal with the second polarization direction.

In a tenth possible design, the first deflection layer is a metasurface layer with a light field modulation pattern provided thereon, and the second deflection layer is an LCOS layer. The design is easy to implement.

In a second aspect, embodiments of the present application also provide a reconfigurable optical branch multiplexer, an optical device in at least two designs of any one of the seventh to tenth possible designs.

In a third aspect, embodiments of the present application also provide a signal monitoring method, which can be applied to optical equipment. The method includes: at a first moment, acquiring a first wavelength division multiplexing WDM signal through an optical system, and injecting the first WDM signal into a first optical switching engine, where the first WDM signal is a monitoring signal including multiple wavelength optical signals. . At the first moment, the first WDM signal from the optical system is incident to the first area in the second optical switching engine through the dispersion system through the first optical switching engine; the first WDM signal from the first optical switching engine is transmitted through the dispersion system The optical signals of each wavelength in the signal are respectively incident on different areas along the second direction in the second optical switching engine. Through the fixed light field modulation pattern on the second optical switching engine, the optical signal of the first wavelength in the first WDM signal from the dispersion system is incident on the first optical detector at the first moment. At the second moment, the second WDM signal is acquired through the optical system, and the second WDM signal is incident on the first optical switching engine. The second WDM signal and the first WDM signal belong to the same optical signal, and the second WDM signal includes multiple optical signals. Monitoring signal of wavelength optical signal. At the second moment, the first optical switching engine is rotated so that the second WDM signal from the optical system is incident on the second area in the second optical switching engine through the dispersion system; the second WDM signal from the first optical switching engine is transmitted through the dispersion system. The optical signals of each wavelength in the WDM signal are respectively incident on different areas along the second direction in the second optical switching engine; where the first area and the second area are different areas along the first direction in the second optical switching engine. , the first direction and the second direction are perpendicular. Through the light field modulation pattern on the second optical switching engine, the optical signal of the second wavelength in the second WDM signal from the dispersion system is incident on the first optical detector at the second moment.

In a possible design, the first optical switching engine is a MEMS device or a DLP device.

In one possible design, the optical signal from the second optical switching engine can be incident on the optical detector through the first optical switching engine. Specifically, at the first moment, the optical signal of the first wavelength from the dispersion system can be incident on the first optical switching engine through the light field modulation pattern on the second optical switching engine; then, through the first optical switching engine , incident the optical signal of the first wavelength from the second optical switching engine to the first optical detector. At the second moment, the optical signal of the second wavelength from the dispersion system can be incident on the first optical switching engine through the light field modulation pattern; then, through the first optical switching engine, the optical signal from the second optical switching engine can be incident on the first optical switching engine. The optical signal of the second wavelength is incident on the first optical detector.

In a possible design, dispersion processing can be performed on the first WDM signal and the second WDM signal through one of the following implementation methods:

Implementation method 1: The dispersion system includes: a first lens, a dispersion element and a second lens.

At the first moment, the light spot of the first WDM signal from the first optical switching engine is amplified through the first lens; the optical signals of each wavelength in the first WDM signal from the first lens are dispersed through the dispersion element. In different directions; through the second lens, the optical signals of each wavelength in the first WDM signal from the dispersion element are incident on different areas along the second direction in the second optical switching engine.

At the second moment, the light spot of the second WDM signal from the first optical switching engine is amplified through the first lens; the optical signals of each wavelength in the second WDM signal from the first lens are dispersed through the dispersion element. In different directions; through the second lens, the optical signals of each wavelength in the second WDM signal from the dispersion element are incident on different areas along the second direction in the second optical switching engine.

Implementation method two: The dispersion system includes: a dispersion element and a second lens.

At the first moment, the optical signals of each wavelength in the first WDM signal from the first optical switching engine can be dispersed in different directions through the dispersion element; each of the first WDM signals from the dispersion element can be dispersed through the second lens. The optical signals of the wavelength are incident on different areas along the second direction in the second optical switching engine.

At the second moment, the light of each wavelength in the second WDM signal from the first optical switching engine can be The signal is dispersed in different directions; through the second lens, the optical signals of each wavelength in the second WDM signal from the dispersion element are incident on different areas along the second direction in the second optical switching engine.

In one possible design, the dispersive element is a grating, a prism or a diffractive optical element DOE device.

In a possible design, the method may further include: at the first moment, incident the optical signal of the third wavelength in the first WDM signal from the dispersion system through the light field modulation pattern on the second optical switching engine. a second optical detector; at a second moment, the optical signal of the fourth wavelength in the second WDM signal from the dispersion system is incident on the second optical detector through the light field modulation pattern on the second optical switching engine.

In a possible design, the second optical switching engine is a MEMS device, a liquid crystal on silicon LCOS device, a DOE device with a light field modulation pattern provided thereon, or a metasurface device with a light field modulation pattern provided thereon.

In one possible design, the method may also include:

The third WDM signal is acquired through the optical system, and the third WDM signal is incident on the dispersion system. The third WDM signal may be a service signal.

The optical signals of each wavelength in the third WDM signal are incident on different areas along the second direction in the second optical switching engine through the dispersion system.

The second optical switching engine includes a first deflection layer and a second deflection layer. Wherein, a light field modulation pattern is provided on the first deflection layer, the first deflection layer is used to adjust the transmission direction of the first WDM signal and the second WDM signal, and the second deflection layer is used to adjust the transmission direction of the third WDM signal. In this way, through the light field modulation pattern on the first deflection layer, the optical signal of the first wavelength from the dispersion system can be incident on the first photodetector at the first moment, and the second light signal from the dispersion system can be incident on the first photodetector at the second moment. The optical signal of the wavelength is incident on the first optical detector; through the second deflection layer, the optical signal of each wavelength in the third WDM signal from the dispersion system can be incident on the corresponding output port.

In a possible design, the first WDM signal, the second WDM signal and the third WDM signal may all be linearly polarized optical signals, the polarization directions of the first WDM signal and the second WDM signal are the first polarization direction, and the first WDM signal and the second WDM signal are linearly polarized. The polarization direction of the three WDM signals is the second polarization direction, and the first polarization direction and the second polarization direction are perpendicular. In addition, the third WDM signal may include a fourth WDM signal and a fifth WDM signal. The first deflection layer and the second deflection layer on the second optical switching engine are stacked layers. The first deflection layer is used to adjust the transmission direction of the optical signal in the first polarization direction, and the second deflection layer is used to adjust the transmission direction of the optical signal in the second polarization direction.

At the first moment, the fourth WDM signal can be acquired through the optical system, and the fourth WDM signal is incident on the polarization beam combiner; the first WDM signal from the optical system is sequentially passed through the polarization beam combiner and The dispersion system is incident on the first area in the second optical switching engine; in this way, the first WDM signal from the first optical switching engine and the fourth WDM signal from the optical system can be synthesized into the first path of light through the polarization beam combiner signal, and the first optical signal is incident on the dispersion system; through the dispersion system, the optical signals of each wavelength of the WDM signal in the first optical signal from the polarization beam combiner are incident on the second optical switching engine along the second different areas in the direction.

At the second moment, the fifth WDM signal can be acquired through the optical system, and the fifth WDM signal is incident on the polarization beam combiner; the first optical switching engine is rotated, so that the second WDM signal of the optical system passes through the polarization beam combiner and The dispersion system is incident on the second area in the second optical switching engine; in this way, the second WDM signal from the first optical switching engine and the fifth WDM signal from the optical system can be synthesized into a second path of light through the polarization beam combiner signal, and the second optical signal is incident on the dispersion system; and then the optical signals of each wavelength of the WDM signal in the second optical signal from the polarization beam combiner are incident on the second optical switching engine along the second optical signal through the dispersion system. Different areas in two directions.

In a possible design, the optical system includes: an input port, an optical splitter, a first polarization conversion unit and a second polarization conversion unit.

At the first moment, the sixth WDM signal can be received through the input port, and the sixth WDM signal can be incident on the optical branch device; the sixth WDM signal from the input port is divided into the eighth WDM signal and the ninth WDM signal through the optical splitter, and the eighth WDM signal is incident on the first polarization conversion unit, and the ninth WDM signal is incident on the second polarization conversion unit; Conversion unit; converts the polarization direction of the eighth WDM signal from the optical splitter into the first polarization direction through the first polarization conversion unit to obtain the first WDM signal; converts the ninth WDM signal from the optical splitter through the second polarization conversion unit The polarization direction of the signal is converted to the second polarization direction to obtain a fourth WDM signal.

At the second moment, the seventh WDM signal can be received through the input port, and the seventh WDM signal is incident on the optical splitter; the seventh WDM signal from the input port is divided into the tenth WDM signal and the eleventh WDM signal through the optical splitter signal, and the tenth WDM signal is incident to the first polarization conversion unit, and the eleventh WDM signal is incident to the second polarization conversion unit; the polarization direction of the tenth WDM signal from the optical splitter is converted through the first polarization conversion unit is the first polarization direction, and a second WDM signal is obtained; and the polarization direction of the eleventh WDM signal from the optical splitter is converted into the second polarization direction through the second polarization conversion unit, and the fifth WDM signal is obtained.

In one possible design, the first deflection layer is a metasurface layer with a light field modulation pattern provided thereon, and the second deflection layer is an LCOS layer.

The technical effects that can be achieved by the above-mentioned second aspect or the third aspect can be described with reference to the technical effects that can be achieved by any possible design in the above-mentioned first aspect, and the repeated points will not be discussed.

Description of drawings

Figure 1 is an architecture diagram of a communication system provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of the first optical device provided by the embodiment of the present application;

Figure 3A is a schematic structural diagram of an optical system in the first optical device provided by the embodiment of the present application;

Figure 3B is a schematic structural diagram of another optical system in the first optical device provided by the embodiment of the present application;

Figure 4 is a schematic diagram of the first optical path on the first plane in the first optical device provided by the embodiment of the present application;

Figure 5 is a schematic diagram of the optical path on the second plane in the first optical device provided by the embodiment of the present application;

Figure 6A is a schematic diagram of light spot distribution on the optical switching engine 24 at different times in the first optical device provided by the embodiment of the present application;

Figure 6B is a schematic diagram of the second optical path on the first plane in the first optical device provided by the embodiment of the present application;

Figure 6C is a schematic diagram of a light field modulation pattern provided by an embodiment of the present application;

Figure 6D is a schematic diagram of another light field modulation pattern provided by an embodiment of the present application;

Figure 6E is a schematic structural diagram of the second optical device provided by the embodiment of the present application;

Figure 6F is a schematic diagram of the first optical path on the first plane in the second optical device provided by the embodiment of the present application;

Figure 6G is a schematic diagram of the second optical path on the first plane in the second optical device provided by the embodiment of the present application;

Figure 6H is a schematic diagram of another light field modulation pattern provided by an embodiment of the present application;

Figure 6I is a schematic diagram of yet another light field modulation pattern provided by an embodiment of the present application;

Figure 7A is a schematic diagram of a dispersion system 23 provided by an embodiment of the present application;

Figure 7B is a schematic diagram of another dispersion system 23 provided by the embodiment of the present application;

Figure 8A is a schematic structural diagram of a third optical device provided by an embodiment of the present application;

Figure 8B is a schematic diagram of the first optical path on the first plane in the third optical device provided by the embodiment of the present application;

Figure 8C is a schematic diagram of the second optical path on the first plane in the third optical device provided by the embodiment of the present application;

Figure 8D is a schematic diagram of the optical path on the second plane in the third optical device provided by the embodiment of the present application;

Figure 9 is a schematic structural diagram of a fourth optical device provided by an embodiment of the present application;

Figure 10A is a first structural schematic diagram of the optical system 21 in the fourth optical device provided by the embodiment of the present application;

Figure 10B is a second structural schematic diagram of the optical system 21 in the fourth optical device provided by the embodiment of the present application;

Figure 10C is a third structural schematic diagram of the optical system 21 in the fourth optical device provided by the embodiment of the present application;

Figure 11A is a schematic structural diagram of the fifth optical device provided by the embodiment of the present application;

Figure 11B is a schematic structural diagram of a sixth optical device provided by an embodiment of the present application;

Figure 11C is a first structural schematic diagram of the optical system 21 in the sixth optical device provided by the embodiment of the present application;

Figure 11D is a second structural schematic diagram of the optical system 21 in the sixth optical device provided by the embodiment of the present application;

Figure 11E is a third structural schematic diagram of the optical system 21 in the sixth optical device provided by the embodiment of the present application;

Figure 12A is a schematic structural diagram of a seventh optical device provided by an embodiment of the present application;

Figure 12B is a schematic diagram of the optical path on the second plane in the seventh optical device provided by the embodiment of the present application;

Figure 12C is a schematic diagram of the first optical path on the first plane in the seventh optical device provided by the embodiment of the present application;

Figure 12D is a schematic diagram of the second optical path on the first plane in the seventh optical device provided by the embodiment of the present application;

Figure 13 is a structural block diagram of a reconfigurable optical branch multiplexer provided by an embodiment of the present application;

Figure 14 is a schematic flow chart of a signal monitoring method provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

In the optical path diagram of this application, the components shown in the dotted box transparently transmit WDM signals in the plane shown in the optical path diagram where they are located. For example, in FIG. 4 below, in the first plane, the dispersion system 23 transparently transmits the first WDM signal and the second WDM signal. For another example, in FIG. 8D below, in the second plane, the optical switching engine 22 and the lens 25 transparently transmit the first WDM signal and the second WDM signal.

In the embodiments of this application, the number of nouns means "singular noun or plural noun", that is, "one or more", unless otherwise specified. "At least one" means one or more, and "plurality" means two or more. "And/or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and/or B can mean: A alone exists, A and B exist simultaneously, and B alone exists. “At least one of the following” or similar expressions refers to any combination of these items (items), including any combination of a single item (items) or a plurality of items (items).

In addition, it should be understood that in the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing the description, and should not be understood as indicating or implying relative importance, nor should they be understood as To indicate or imply an order.

Figure 1 is an architectural diagram of a communication system provided by an embodiment of the present application. As shown in Figure 1, the system includes: one or more reconfigurable optical add/drop multiplexers (ROADM), one or more optical amplifiers (optical amplifier, OA) and one or more An optical channel monitor (OCM). Each device in the system can be connected through optical fiber to transmit WDM signals. The following describes the equipment in the system respectively.

ROADM can dynamically adjust the wavelength in the WDM signal, for example, inserting an optical signal of wavelength 1 into the WDM signal. For another example, the optical signal of wavelength 2 is separated from the WDM signal.

At least one WSS may be included in the ROADM. The WSS may include at least one input port and at least one output port. The WDM signal can be incident on the WSS from the input port, and then the optical signals of each wavelength in the WDM signal can be routed to the corresponding output port by the WSS.

OA can amplify WDM signals. Optionally, the OA can convert the energy of the pump light into the energy of the WDM signal based on the stimulated emission of the laser, thereby amplifying the WDM signal.

OCM can monitor the spectrum of WDM signals in real time. The monitoring results of OCM can be used to determine whether false light is uploaded in the WDM signal. Specifically, when a change in the channel state of the WDM signal is detected, the OCM may notify the system controller (not shown in the figure), so that the system controller can process accordingly. For example, when the OCM detects that the channel corresponding to the optical signal of wavelength 3 is missing in the WDM signal, the system controller can upload dummy light (DL) of wavelength 3 to fill in the missing channel in the WDM signal. The OCM used to determine whether to upload false light in the WDM signal can be set separately or integrated in the WSS.

An embodiment of the present application provides an optical device. The optical device can be any device in the communication system shown in Figure 1, such as a WSS; or the optical device can also be other optical devices, such as a photo-detector (PD). Referring to the structural diagram shown in Figure 2, the optical device will be described in detail below.

As shown in Figure 2, the optical device includes: an optical system 21, an optical switching engine 22, a dispersion system 23, an optical switching engine 24 and a PD 201. The optical device may also include at least one input port and at least one output port. Wherein, the optical device can receive a WDM signal input to the optical device through any input port, and the optical device can output a WDM signal to an optical device other than the optical device through any output port. Each component of the optical device shown in Figure 2 will be described in detail below.

The optical system 21 can be used to acquire the first WDM signal at the first moment, and incident the first WDM signal to the optical switching engine 22; to acquire the second WDM signal at the second moment, and incident the second WDM signal to the optical switching engine 22. . The first WDM signal and the second WDM signal belong to the same optical signal, and both the first WDM signal and the second WDM signal are monitoring signals including multiple wavelength optical signals.

The optical system 21 processes the first WDM signal and the second WDM signal in the same manner. The following description takes the first WDM signal as an example.

As shown in FIG. 3A , the optical system 21 may include an input port 211 of the optical device. The input port 211 may receive a first WDM signal incident on the optical device at the first moment, and incident the first WDM signal to the optical switching engine. twenty two.

Optionally, as shown in FIG. 3B , based on the optical system 21 shown in FIG. 3A , the optical system 21 further includes a collimating element 212 . The input port 211 can incident the received first WDM signal to the collimating element 212 at the first moment; after the collimating element 212 performs collimation processing on the first WDM signal from the input port 211, the collimated signal can be The first WDM signal is incident on the optical switching engine 22 . The collimating element 212 may be a lens (for example, a convex lens), and the input port 211 may be disposed near the front focal plane of the collimating element 212 .

The optical switching engine 22 can be used to incident the first WDM signal from the optical system 21 to the first area in the optical switching engine 24 through the dispersion system 23 at the first moment; and to rotate at the second moment, so that the first WDM signal from the optical system 21 The second WDM signal is incident to the second area in the optical switching engine 24 through the dispersion system 23; where the first area and the second area are different areas in the optical switching engine 24 along the first direction. Among them, the optical switching engine 22 can rotate under the control of the controller to change the deflection angle of the first WDM signal in the first plane (such as the x-z plane), so that different WDM signals are incident through the dispersion system 23 at different times. to different areas in the optical switching engine 24 along the first direction. In the first plane, the dispersion system 23 can transmit the WDM signal from the optical switching engine 22 , that is, the WDM signal from the optical switching engine 22 is not processed.

Optionally, the first plane is a switching plane. In the switching plane, the optical signal incident on the optical switching engine 24 passes through the optical After the action of the switching engine 24, it can be reflected along a preset angle and finally output to the target output port.

Optionally, the first direction is the port direction. The port direction may be the direction in which the ports are arranged.

For example, as shown in the upper diagram of Figure 4, at the first moment, the optical switching engine 22 is at the angle position 1, and the first WDM signal from the optical system 21 can be incident into the optical switching engine 24 through the dispersion system 23 x ₁ in the corresponding first area. As shown in the lower figure of Figure 4, at the second moment, the optical switching engine 22 is at the angle position 2, and the second WDM signal from the optical system 21 can be incident on the second signal corresponding to x ₂ in the optical switching engine 24 through the dispersion system 23. in the area. At this time, the first plane is the xz plane, that is, the switching plane; the first direction can be the x-axis direction, that is, the port direction.

Among them, the optical switching engine 22 can be a micro-electromechanical system (MEMS) device or a digital light processing (Digital Light Processing, DLP) device, thereby enabling rapid rotation, that is, rapid angular scanning.

The dispersion system 23 can perform dispersion processing on the WDM signal. Specifically, the dispersion system 23 can respectively incident the optical signals of each wavelength in the first WDM signal from the optical switching engine 22 to different areas along the second direction in the optical switching engine 24 at the first moment; The optical signals of each wavelength in the second WDM signal from the optical switching engine 22 are respectively incident on different areas along the second direction in the optical switching engine 24 . The second direction is perpendicular to the first direction above. In other words, the dispersion system 23 may perform dispersion processing on the first WDM signal in a second plane (eg, y-z plane), which is perpendicular to the first plane. In the second plane, the optical switching engine 22 does not process WDM signals.

Optionally, the second plane is a dispersion plane. In the dispersion plane, optical signals of different wavelengths in the WDM signal are dispersed and expanded by the dispersion system 23 and then incident on different areas on the optical switching engine 24 .

Optionally, the second direction may be a dispersion direction. The dispersion direction is the direction in which the dispersion of optical signals of different wavelengths spreads.

For example, as shown in FIG. 5 , the dispersion system 23 injects the optical signal of the first wavelength in the first WDM signal from the optical switching engine 22 into the area corresponding to y ₁ in the optical switching engine 24 at the first moment. At the first moment, the system 23 injects the optical signal of the second wavelength in the second WDM signal from the optical switching engine 22 into the area corresponding to y ₂ in the optical switching engine 24 . At this time, the second plane may be the yz plane, which is the dispersion plane; the second direction may be the y-axis direction, which is the dispersion direction.

In this way, the WDM signal is processed by the optical switching engine 22 and the dispersion system 23. At the first moment, the optical signals of each wavelength in the first WDM signal are respectively incident on different areas in the first area; at the second moment, the second The optical signals of each wavelength in the WDM signal are respectively incident on different areas in the second area. For example, FIG. 6A shows the light spot distribution on the optical switching engine 24 at different times, where λ ₁ -λ ₇ are the wavelengths of the optical signals in the first WDM signal and the second WDM signal respectively. As shown in FIG. 6A , the light spots of the optical signals of different wavelengths in the first WDM signal and the second WDM signal are separated in the second direction (for example, the y-axis direction), and due to the angle change of the optical switching engine 22, the The positions of one WDM signal and the second WDM signal in the first direction (eg, x-axis direction) are different.

The optical switching engine 24 can be used to incident the optical signal of the first wavelength in the first WDM signal from the dispersion system 23 to the PD 201 at the first moment through the fixed light field modulation pattern, and to transmit the optical signal from the dispersion system 23 at the second moment. The optical signal of the second wavelength in the second WDM signal is incident on the PD 201. The light field modulation pattern may be a phase modulation pattern capable of controlling the reflection direction of the optical signal.

In some possible ways, the optical switching engine 24 can directly incident the optical signal of the first wavelength in the first WDM signal from the dispersion system 23 to the PD 201 at the first moment through a fixed light field modulation pattern, and at the second moment At this moment, the optical signal of the second wavelength in the second WDM signal from the dispersion system 23 is directly incident on the PD 201 . For example, as shown in the upper diagram of FIG. 4 , at the first moment, the optical switching engine 24 can directly incident the optical signal of the first wavelength in the first area corresponding to x ₁ to the PD 201 . As shown in the lower figure of FIG. 4 , at the second moment, the optical switching engine 24 can directly incident the optical signal of the second wavelength in the second area corresponding to x ₂ to the PD 201 .

In other possible ways, the optical switching engine 24 can incident optical signals of various wavelengths to the PD 201 through the optical switching engine 22 . Specifically, the optical switching engine 24 is used to incident the optical signal of the first wavelength in the first WDM signal from the dispersion system 23 to the optical switching engine 22 at the first moment through a fixed light field modulation pattern, and at the second moment The optical signal of the second wavelength in the second WDM signal from the dispersion system 23 is incident to the optical switching engine 22; the optical switching engine 22 is also used to incident the optical signal of the first wavelength from the optical switching engine 24 to the PD at the first moment. 201. Inject the optical signal of the second wavelength from the optical switching engine 24 to the PD 201 at the second moment. For example, as shown in the upper diagram of FIG. 6B , at the first moment, the optical switching engine 24 can transmit the optical signal of the first wavelength in the first area corresponding to x ₁ to the PD 201 through the optical switching engine 22 . As shown in the lower diagram of FIG. 6B , at the second moment, the optical switching engine 24 can incident the optical signal of the second wavelength in the second area corresponding to x ₂ to the PD 201 through the optical switching engine 22 .

Optionally, the optical switching engine 24 can incident the WDM signal to the PD 201 through the dispersion system. Specifically, the optical switching engine 24 can be used to incident the optical signal of the first wavelength in the first WDM signal from the dispersion system 23 to the PD 201 through the dispersion system 23 at the first moment through a fixed light field modulation pattern, and at the first moment At the second moment, the optical signal of the second wavelength in the second WDM signal from the dispersion system 23 is incident on the PD 201 through the dispersion system 23. Since the dispersion system 23 does not process the WDM signal in the first plane, the specific content of the optical switching engine 24 incident on the WDM signal to the PD 201 through the dispersion system can refer to the description of Figure 4 and Figure 6B, and will not be repeated here. .

Optionally, the light field modulation pattern can be pre-edited or pre-recorded. Through the light field modulation pattern, the optical switching engine 24 injects an optical signal of one wavelength in the WDM signal into the PD 201 at each moment, thereby realizing monitoring of the WDM signal.

For example, the light field modulation pattern may include the box shown by the dotted line in FIG. 6C. The ellipse shown by the dotted line is the light spot distribution on the optical switching engine 24 at different times. Only the optical signal incident on the box shown by the dotted line can be transmitted. Go to PD 201. Among them, at time t ₁ , only the optical signal with wavelength λ ₁ is incident on PD 201; at time t ₂ , only the optical signal with wavelength λ ₂ is incident on PD 201.

As another example, the light field modulation pattern may include the box shown by the dotted line in FIG. 6D . The ellipse shown by the dotted line is the light spot distribution on the light exchange engine 24 at different times. Only the light incident on the box shown by the dotted line can be incident. Go to PD 201. Among them, at time t ₁ , only the optical signal with wavelength λ ₁ is incident on PD 201; at time t ₂ , only the optical signal with wavelength λ ₃ is incident on PD 201.

It should be understood that Figures 6C and 6D are only examples, and other fixed light field modulation patterns can also be used, as long as the light field modulation pattern can make only one wavelength of the optical signal in the WDM signal incident on the PD 201 at each moment. Can.

Optionally, the optical switching engine 24 is a MEMS device, an LCOS device, a diffractive optical element (Diffractive optical element, DOE) device with a light field modulation pattern provided thereon, or a metasurface device with a light field modulation pattern provided thereon.

When the optical switching engine 24 is a MEMS device or an LCOS device, the wavelength of the optical signal transmitted to the PD 201 can be selected through pixelated control, that is, the required beam deflection function is achieved. Specifically, the optical switching engine 24 includes multiple pixel units, and each pixel unit can be independently edited or controlled. Therefore, the set light field modulation pattern can be edited on the optical switching engine 24 in advance, so that it can be selectively transmitted to the PD 201 the wavelength of the optical signal.

When the optical switching engine 24 is a DOE or metasurface device, the incident light can be modulated by inscribing a microstructure corresponding to the light field modulation pattern on the surface, so that the wavelength of the optical signal transmitted to the PD 201 can be selected to achieve selection. The optical signal of the wavelength is deflected.

In addition, the PD 201 can be integrated with other components in the optical device or can be provided separately. When the PD 201 is integrated with other components in the optical device, the optical switching engine 24 can convert the data from the dispersion system 23 at the first moment. The optical signal of the first wavelength in the first WDM signal is incident on the photosensitive area of the PD 201 , and the optical signal of the second wavelength on the second WDM signal from the dispersion system 23 is incident on the photosensitive area of the PD 201 at the second moment. When other components in the optical device of the PD 201 are separately arranged, the optical switching engine 24 can incident the optical signal of the first wavelength in the first WDM signal from the dispersion system 23 to the PD 201 through the monitoring port at the first moment, and at the first moment At the second moment, the optical signal of the second wavelength in the second WDM signal from the dispersion system 23 is incident on the PD 201 through the monitoring port. Among them, the monitoring port is an output port through which other components in the optical device are connected to the PD 201.

PD 201 can detect the optical signal incident on PD 201. For example, PD 201 can detect the optical power of the optical signal incident on PD 201. Specifically, the PD 201 can be used to detect the optical signal of the first wavelength incident on the PD 201 at the first moment, and to detect the optical signal of the second wavelength incident on the PD 201 at the second moment.

In the optical equipment shown in FIG. 2, through the rotation of the optical switching engine 22, different WDM signals in one optical signal can be incident on different areas on the optical switching engine 24 at different times, that is, the WDM signals in the optical signal in this path can be incident on different areas of the optical switching engine 24 at different times. The WDM signal quickly scans the light spot position on the optical switching engine 24; and, through the dispersion system 23, the light of different wavelengths in each WDM signal in the optical signal is incident on different areas on the optical switching engine 24 respectively; Through the fixed light field modulation pattern on the optical switching engine 24, an optical signal of one wavelength of one WDM signal in the optical signal can be incident on the PD 201 at each moment. In this way, the wavelength of the optical signal incident on the PD 201 can be quickly adjusted by rotating the optical switching engine 22 without updating the phase information on the optical switching engine 24, thereby increasing the speed of monitoring WDM signals.

Optionally, WDM signals can be monitored through multiple PDs. The following is an example of monitoring WDM signals through two PDs.

As shown in Figure 6E, the optical device also includes: PD 202.

The optical switching engine 24 can use a fixed light field modulation pattern to incident the optical signal of the first wavelength in the first WDM signal from the dispersion system 23 to the PD 201 at the first moment, and convert the first WDM signal from the dispersion system 23 into the PD 201 at the first moment. The optical signal of the third wavelength is incident on the PD 202; at the second moment, the optical signal of the second wavelength in the second WDM signal from the dispersion system 23 is incident on the PD 201, and the fourth of the second WDM signal from the dispersion system 23 is incident on the PD 201. The optical signal of wavelength is incident on PD 202.

PD 202 can detect the light signal incident on PD 202. Specifically, the PD 202 can be used to detect the optical signal of the third wavelength incident on the PD 202 at the first moment, and detect the optical signal of the fourth wavelength incident on the PD 202 at the second moment.

In some possible ways, the optical switching engine 24 can use a fixed light field modulation pattern to directly incident the optical signal of the first wavelength in the first WDM signal from the dispersion system 23 to the PD 201 at the first moment, and convert the light signal from the dispersion system 23 to the PD 201 at the first moment. The optical signal of the third wavelength in the first WDM signal of the system 23 is directly incident on the PD 202; at the second moment, the optical signal of the second wavelength in the second WDM signal from the dispersion system 23 is directly incident on the PD 201, and the optical signal from the dispersion system 23 is directly incident on the PD 201. The optical signal of the fourth wavelength in the second WDM signal of the system 23 is directly incident on the PD 202 . For example, as shown in the upper diagram of Figure 6F, at the first moment, the optical switching engine 24 can directly incident the optical signal of the first wavelength in the first area corresponding to x ₁ to the PD 201, and transmit the first _wavelength corresponding to The optical signal of the third wavelength in the area is directly incident on the PD 202 . As shown in the lower figure of Figure 6F, at the second moment, the optical switching engine 24 can directly incident the optical signal of the second wavelength in the second area corresponding to x ₂ to the PD 201, and transmit the fourth optical signal in the second area corresponding to x ₂ The optical signal of the wavelength is directly incident on the PD 202.

In other possible ways, the optical switching engine 24 can respectively transmit optical signals of different wavelengths to the PD 201 and the PD 202 through the optical switching engine 22 . Specifically, the optical switching engine 24 is used to incident the optical signal of the first wavelength and the optical signal of the third wavelength in the first WDM signal from the dispersion system 23 to the optical switching engine at the first moment through a fixed light field modulation pattern. 22. At the second moment, combine the optical signal of the second wavelength and the fourth wave in the second WDM signal from the dispersion system 23 The long optical signal is incident on the optical switching engine 22; the optical switching engine 22 is also used to incident the optical signal of the first wavelength from the optical switching engine 24 to the PD 201 at the first moment; The optical signal of the third wavelength is incident on the PD 202, the optical signal of the second wavelength from the optical switching engine 24 is incident on the PD 201 at the second moment, and the light of the fourth wavelength from the optical switching engine 24 is incident on the PD 201 at the second moment. The signal is incident on PD 202. For example, as shown in the upper diagram of Figure 6G, at the first moment, the optical switching engine 24 can incident the optical signal of the first wavelength in the first area corresponding to x ₁ to the PD 201 through the optical switching engine 22, and change x ₁ The optical signal of the third wavelength in the corresponding first area is incident on the PD 202 through the optical switching engine 22 . As shown in the lower figure of Figure 6G, at the second moment, the optical switching engine 24 can incident the optical signal of the second wavelength in the second area corresponding to x ₂ to the PD 201 through the optical switching engine 22, and transmit the _second wavelength corresponding to The optical signal of the fourth wavelength in the area is incident on the PD 202 through the optical switching engine 22 .

Optionally, the light field modulation pattern can be pre-edited or pre-recorded. Through the light field modulation pattern, the optical switching engine 24 can respectively inject optical signals of different wavelengths in the first WDM signal into different PDs at one time. Thus, monitoring of the first WDM signal is achieved.

For example, the light field modulation pattern may include the box shown by the dotted line in FIG. 6H. The ellipse shown by the dotted line is the light spot distribution on the optical switching engine 24 at different times. The optical signal incident on the left box shown by the dotted line may Transmitted to PD 201, the optical signal incident on the right box shown by the dotted line can be transmitted to PD 202. Among them, at time t ₁ , the optical signal with wavelength λ ₁ is incident on PD 201, and the optical signal with wavelength λ ₂ is incident on PD 202; at time t ₂ , the optical signal with wavelength λ ₃ is incident on PD 201, and the optical signal with wavelength λ 2 is incident on PD 201. An optical signal of λ ₄ is incident on the PD 202 .

As another example, the light field modulation pattern may include the box shown by the dotted line in FIG. 6I. The ellipse shown by the dotted line is the light spot distribution on the optical switching engine 24 at different times. The optical signal incident on the left box shown by the dotted line can be transmitted to PD 201, and the optical signal incident on the right box shown by the dotted line can be transmitted to PD 202. Among them, at time t ₁ , the optical signal with wavelength λ ₁ is incident on PD 201, and the optical signal with wavelength λ ₃ is incident on PD 202; at time t ₂ , the optical signal with wavelength λ ₄ is incident on PD 201, and the optical signal with wavelength λ 3 is incident on PD 201. An optical signal of λ ₆ is incident on the PD 202 .

Through this optical device, optical signals of multiple wavelengths can be detected at the same time, thereby further increasing the speed of monitoring WDM signals.

Optionally, in the optical device shown in FIG. 2 , the dispersion system 23 can be implemented through one of the following implementation methods.

Implementation Mode 1: As shown in FIG. 7A , the dispersion system 23 may include: a lens 231 , a dispersion element 232 and a lens 233 .

Among them, the lens 231 and the lens 233 may have a 4f structure. Specifically, the optical system 21 is located near the front focal surface of the lens 231 ; the dispersion element 232 is located near the back focal surface of the lens 231 and the front focal surface of the lens 233 ; the optical exchange engine 24 is located near the back focal surface of the lens 233 .

Optionally, the lens 231 can be used to perform light spot transformation on the WDM signal from the optical switching engine 22. For example, the lens 231 can amplify the light spot of the WDM signal. Then, the lens 231 can incident the spot-converted WDM signal to the dispersion element 232 . For example, the lens 231 can amplify the light spot of the first WDM signal from the optical switching engine 22 at the first moment; and amplify the light spot of the second WDM signal from the optical switching engine 22 at the second moment.

The dispersion element 232 can be used to disperse the optical signals of each wavelength in the WDM signal from the first lens 231 to different directions; that is to say, the dispersion element 232 can disperse the optical signals of each wavelength in the WDM signal from the first lens 231 through dispersion. The optical signals are respectively emitted at different angles in the second direction. For example, the dispersion element 232 can disperse the optical signals of each wavelength in the first WDM signal from the first lens 231 to different directions at the first moment; and disperse the optical signals of each wavelength in the second WDM signal from the first lens 231 at the second moment. Light signals of wavelengths are dispersed in different directions.

Optionally, the dispersion element 232 is a grating, prism or diffractive optical element (Diffractive optical element, DOE) device.

The lens 233 may be used to incident optical signals of various wavelengths in the WDM signal from the dispersion element 232 into different areas along the second direction in the optical switching engine 24 . Specifically, the lens 233 can convert the angle of the optical signal of each wavelength in the WDM signal into a position, thereby incident the optical signal of each wavelength in the WDM signal into different areas along the second direction in the optical switching engine 24 respectively. For example, the lens 233 can incident the optical signals of each wavelength in the first WDM signal from the dispersion element 232 to different areas along the second direction in the optical switching engine 24 at the first moment; The optical signals of each wavelength in the second WDM signal are incident on different areas in the optical switching engine 24 along the second direction.

In this application, the lens 231 and the lens 233 can be cylindrical lenses, which can process WDM signals in the second plane and transparently transmit the WDM signals in the first plane.

Implementation Mode 2: As shown in FIG. 7B , the dispersion system 23 may include: a dispersion element 232 and a lens 233 .

Optionally, the dispersion element 232 is located near the front focal plane of the lens 233 , and the optical exchange engine 24 is located near the back focal plane of the lens 233 .

For the specific contents of the dispersion element 232 and the lens 233, please refer to Implementation Mode 1, and the repeated parts will not be described again.

In the second implementation, the dispersion element 232 may be used to disperse the optical signals of each wavelength in the WDM signal from the optical switching engine 22 to different directions. For example, the dispersion element 232 can disperse the optical signals of each wavelength in the first WDM signal from the optical switching engine 22 to different directions at the first moment; and disperse the optical signals of each wavelength in the second WDM signal from the optical switching engine 22 at the second moment. Light signals of wavelengths are dispersed in different directions.

Through implementation method 1 and implementation method 2, multiple implementation methods of the dispersion system 23 are provided, and the implementation is relatively simple.

Optionally, as shown in FIG. 8A , based on the optical device shown in FIG. 2 , the optical device further includes: a lens 25 .

The lens 25 may be disposed between the optical switching engine 22 and the optical switching engine 24 . For example, the optical switching engine 22 and the optical switching engine 24 are respectively located near the front focal plane and the rear focal plane of the lens 25 .

The optical switching engine 22 can rotate under the control of the controller to change the deflection angle of the WDM signal in the first plane (eg, x-z plane), so that the WDM signal is incident on the lens 25 at different angles at different times. The lens 25 can convert the angle of the first WDM signal into a position, so that the WDM signal is incident on different areas along the first direction in the optical switching engine 24 at different times. The lens 25 may be a cylindrical lens, which may process the first WDM signal in a first plane and transparently transmit the first WDM signal in a second plane.

In some possible ways, as shown in the upper diagram of FIG. 8B , at the first moment, the first WDM signal received through the optical system 21 may be incident on the optical switching engine 22 . The optical switching engine 22 deflects the first WDM signal from the optical system 21 at a certain angle and then makes it incident on the lens 25 . After the first WDM signal undergoes light spot transformation through the lens 25, it is incident into the first area corresponding to _x3 in the optical switching engine 24. The optical switching engine 24 deflects the optical signal of the first wavelength in the first WDM signal from the lens 25 at a certain angle, and then reflects it onto the lens 25 . The lens 25 can convert the angle of the optical signal of the first wavelength from the optical switching engine 24 into a position change of the output end, so that the optical signal of the first wavelength is incident on the PD 201 . As shown in the lower figure of Figure 8B, at the second moment, the second WDM signal can be incident into the second area corresponding to x ₄ in the optical switching engine 24 through the optical switching engine 22 and the lens 25; then, the second WDM signal in the second Optical signals of two wavelengths can be incident on the PD 201 through the lens 25 .

In other possible ways, as shown in the upper diagram of FIG. 8C , at the first moment, the first WDM signal can be incident on the first area corresponding to x ₃ in the optical switching engine 24 through the optical switching engine 22 and the lens 25 in sequence. ; The optical switching engine 24 deflects the optical signal of the first wavelength in the first WDM signal from the lens 25 at a certain angle, and then reflects it onto the lens 25 . The lens 25 can convert the angle of the optical signal of the first wavelength from the optical switching engine 24 into a position change of the output end, so that the optical signal of the first wavelength is incident on the optical switching engine 22 . Optical switching engine 22 may process the third signal from optical switching engine 24 The optical signal of one wavelength is deflected at a certain angle and then is incident on the PD 201 . As shown in the lower figure of Figure 8C, at the second moment, the second WDM signal can be incident into the second area corresponding to x ₄ in the optical switching engine 24 through the optical switching engine 22 and the lens 25; then, the second WDM signal The optical signal of the second wavelength may be incident on the PD 201 through the lens 25 and the optical switching engine 22 in sequence.

In addition, as shown in FIG. 8D , in the second plane, the optical switching engine 22 and the lens 25 transparently transmit the first WDM signal and the second WDM signal. Therefore, the specific content of FIG. 8D may refer to the description of FIG. 7A and will not be described again here.

Optionally, when monitoring WDM signals through multiple PDs, at the first moment, the lens 25 can process the optical signal of the third wavelength in the first WDM signal in a similar manner to the optical signal of the first wavelength, so that The optical signal of the third wavelength is incident into the PD 202; at the second moment, the lens 25 can process the optical signal of the fourth wavelength in the second WDM signal in a similar manner to the optical signal of the second wavelength, so that the optical signal of the fourth wavelength The optical signal is incident into PD 202, which will not be described again here.

In the communication device shown in FIG. 8A , the WDM signal can be converged toward the optical axis through the lens 25 , thereby reducing the size of the optical switching engine 24 , thereby reducing the space occupied by the optical device and reducing the cost of the optical device.

An embodiment of the present application also provides an optical device. For example, the optical device may be a WSS (optionally, the WSS integrates an optical channel detection function). The optical device will be described in detail below with reference to the structural diagram shown in FIG. 9 .

As shown in Figure 9, the optical device includes: an optical system 21, an optical switching engine 22, a dispersion system 23, a second optical switching engine 24 and a PD 201.

The optical system 21 is used to acquire the first WDM signal at the first moment, and incident the first WDM signal to the optical switching engine 22; to acquire the second WDM signal at the second moment, and incident the second WDM signal to the optical switching engine 22. . The first WDM signal and the second WDM signal belong to the same optical signal, and both the first WDM signal and the second WDM signal are monitoring signals including multiple wavelength optical signals. The optical system 21 is also used to acquire the third WDM signal and incident the third WDM signal to the dispersion system 23 . The third WDM signal may be a service signal.

In some possible ways, as shown in 10A, the optical system 21 may include an input port 211 and an input port 213 of the optical device, wherein the input port 211 is used to receive the first WDM signal at the first moment and transfer the first The WDM signal is incident on the optical switching engine 22, and the second WDM signal is received at the second moment, and the second WDM signal is incident on the optical switching engine 22; the input port 213 is used to receive the third WDM signal, and the third WDM signal is incident on the optical switching engine 22. to dispersion system 23.

Optionally, as shown in FIG. 10B , based on the optical system 21 shown in FIG. 10A , the optical system 21 further includes a collimating element 212 and a collimating element 214 . The input port 211 can incident the first WDM signal received at the first moment to the collimating element 212; after the collimating element 212 performs collimation processing on the first WDM signal from the input port 211, the collimated The first WDM signal is incident on the optical switching engine 22 . The input port 211 can incident the second WDM signal received at the second moment to the collimating element 212; after collimating the second WDM signal from the input port 211, the collimating element 212 can The second WDM signal is incident on the optical switching engine 22 . The input port 213 can incident the received third WDM signal to the collimating element 214; after collimating the third WDM signal from the input port 213, the collimating element 214 can collimate the second WDM signal. The signal is incident on dispersion system 23. The collimating element 212 and the collimating element 214 can be lenses, the input port 211 can be disposed near the front focal plane of the collimating element 212 , and the input port 213 can be disposed near the front focal plane of the collimating element 214 .

In other possible ways, as shown in FIG. 10C , the optical system 21 includes: an input port 211 and an optical splitter 215 . The input port 211 may be used to receive WDM signals and input the received WDM signals to the optical splitter 215 . Optical splitter 215 may be used to split the WDM signal from input port 211 into two WDM signals. specific, The third WDM signal may include a fourth WDM signal and a fifth WDM signal. The input port 211 can be used to receive the sixth WDM signal at the first moment, and input the sixth WDM signal to the optical splitter 215; the optical splitter 215 can be used to divide the sixth WDM signal from the input port 211 into the first WDM signal and Fourth WDM signal. The input port 211 can be used to receive the seventh WDM signal at the second moment, and input the seventh WDM signal to the optical splitter 215; the optical splitter 215 can be used to divide the seventh WDM signal from the input port 211 into a second WDM signal and Fifth WDM signal. Optionally, the optical splitter 215 may be a beam splitter.

The optical switching engine 22 may be configured to incident the first WDM signal from the optical system 21 into the first area in the optical switching engine 24 at a first moment; and rotate at a second moment so that the second WDM signal from the optical system 21 The second area incident on the optical switching engine 24; wherein, the first area and the second area are different areas along the first direction in the optical switching engine 24. For the specific content of the optical switching engine 22, please refer to the description of FIGS. 2 to 8D and will not be described again here.

The dispersion system 23 can perform dispersion processing on the WDM signal. Specifically, the dispersion system 23 can respectively incident the optical signals of each wavelength in the first WDM signal from the optical switching engine 22 to different areas along the second direction in the optical switching engine 24 at the first moment; The optical signals of each wavelength in the second WDM signal from the optical switching engine 22 are respectively incident on different areas along the second direction in the optical switching engine 24 . Wherein, the first direction and the second direction are perpendicular. For the specific content of the dispersion system 23, please refer to the description of FIGS. 2 to 8D and will not be described again here.

The dispersion system 23 can also perform dispersion processing on the third WDM signal. Specifically, the dispersion system 23 can incident the optical signals of each wavelength in the third WDM signal from the optical system 21 into the optical switching engine 24 along the second direction. different regions. The way in which the dispersion system 23 performs dispersion processing on the third WDM signal can refer to the method in which it performs dispersion processing on the first WDM signal, which will not be described again here.

The first WDM signal and the third WDM signal can be incident on the same area in the optical switching engine 24, or can be incident on different areas in the optical switching engine 24; the second WDM signal and the third WDM signal can be incident on the optical switching engine 24. The same area in the engine 24 can also be incident on different areas in the optical switching engine 24 .

Optical switching engine 24 includes a first deflection layer and a second deflection layer.

Wherein, a fixed light field modulation pattern is provided on the first deflection layer, and the first deflection layer is used to adjust the transmission direction of the first WDM signal and the second WDM signal. In this way, the optical switching engine 24 can incident the optical signal of the first wavelength in the first WDM signal from the dispersion system 23 to the PD 201 at the first moment through the light field modulation pattern on the first deflection layer, and transmit it to the PD 201 at the second moment. The optical signal of the second wavelength in the second WDM signal from the dispersion system 23 is incident on the PD 201. That is to say, the first deflection layer can implement the function of the optical switching engine 24 shown in FIGS. 2-8D. Optionally, the first deflection layer is a metasurface layer with a light field modulation pattern provided thereon.

The second deflection layer can be used to adjust the transmission direction of the third WDM signal. In this way, the optical switching engine 24 can incident the optical signals of each wavelength in the third WDM signal from the dispersion system 23 to the corresponding output port through the second deflection layer, that is, the second deflection layer can be used for port switching of the third WDM signal. Optionally, the second deflection layer is an LCOS layer, which can perform pixelated control to select the wavelength of the optical signal incident on any output port.

Wherein, the first deflection layer and the second deflection layer may be located on the same plane, or the first deflection layer and the second deflection layer may be stacked layers.

In the optical equipment shown in Figure 9, through the rotation of the optical switching engine 22, different WDM signals in one optical signal can be incident on different areas on the optical switching engine 24 at different times; and, through the dispersion system 23, such that Different wavelengths of light in each WDM signal in this optical signal are respectively incident on different areas on the optical switching engine 24; through the set light field modulation pattern on the optical switching engine 24, this path of light can be transmitted at each moment. An optical signal of one wavelength in one of the WDM signals is incident on the PD 201 . In this way, the wavelength of the optical signal incident on the PD 201 can be quickly adjusted by rotating the optical switching engine 22 without updating the phase information on the optical switching engine 24, thereby increasing the speed of monitoring WDM signals.

Moreover, when multiple optical signals are simultaneously transmitted in the optical device (for example, an optical signal including a first WDM signal and a second WDM signal, and another optical signal including a third WDM signal), the optical device can quickly Monitor the WDM signal in one optical signal (for example, one optical signal including the first WDM signal and the second WDM signal) without affecting other optical signals (for example, another optical signal including the third WDM signal) transmission; in this way, the optical device can simultaneously realize WSS and spectral detection functions.

Optionally, the first deflection layer can also be used to detect WDM signals through multiple PDs. The following description takes the first deflection layer used to detect WDM signals through two PDs as an example.

As shown in Figure 11A, the optical device also includes: PD 202.

The first deflection layer can use a fixed light field modulation pattern to incident the optical signal of the first wavelength in the first WDM signal from the dispersion system 23 to the PD 201 at the first moment, and convert the first WDM signal from the dispersion system 23 into The optical signal of the third wavelength is incident on the PD 202; at the second moment, the optical signal of the second wavelength in the second WDM signal from the dispersion system 23 is incident on the PD 201, and the fourth of the second WDM signal from the dispersion system 23 is incident on the PD 201. The optical signal of wavelength is incident on PD 202. That is to say, the first deflection layer can implement the function of the optical switching engine 24 shown in FIGS. 6E to 6I.

Optionally, the first WDM signal, the second WDM signal and the third WDM signal are all linearly polarized optical signals, and the polarization directions of the first WDM signal and the second WDM signal are perpendicular to the polarization direction of the third WDM signal. Specifically, the polarization direction of the first WDM signal and the second WDM signal is the first polarization direction, the polarization direction of the third WDM signal is the second polarization direction, and the first polarization direction and the second polarization direction are perpendicular. The third WDM signal may include a fourth WDM signal and a fifth WDM signal.

The first deflection layer and the second deflection layer in the optical switching engine 24 are stacked layers. The first deflection layer can be used to adjust the transmission direction of the optical signal in the first polarization direction, so that the transmission direction of the first WDM signal can be adjusted; the second deflection layer can be used to adjust the transmission direction of the optical signal in the second polarization direction, so that the transmission direction can be adjusted. The transmission direction of the second WDM signal. This application does not limit the order in which the WDM signal is incident on the first deflection layer and the second deflection layer. The following is an example where the WDM signal is incident on the second deflection layer and then on the first deflection layer.

As shown in FIG. 11B , based on the optical device shown in FIG. 9 , the optical device may also include: a polarization beam combiner (PBC) 26 .

The optical system 21 can be used to acquire the fourth WDM signal at the first moment and incident the fourth WDM signal to the PBC 26; to acquire the fifth WDM signal at the second moment and incident the fifth WDM signal to the PBC 26. For the specific content of the optical system 21, please refer to the following description of FIGS. 10A, 11C-11D, and will not be elaborated here.

The optical switching engine 22 can be used to incident the first WDM signal from the optical system 21 to the first area in the optical switching engine 24 through the PBC 26 and the dispersion system 23 at the first moment; and rotate it at the second moment, so that from The second WDM signal of the optical system 21 is incident on the second area in the optical switching engine 24 through the PBC 26 and the dispersion system 23 in turn. For the specific content of the optical switching engine 22, please refer to the description of FIGS. 2-8D and will not be described again here.

The PBC 26 can be used to synthesize the first WDM signal from the optical switching engine 22 and the fourth WDM signal from the optical system 21 into a first optical signal at the first moment, and incident the first optical signal into the dispersion system 23; At the second moment, the second WDM signal from the optical switching engine 22 and the fifth WDM signal from the optical system 21 are synthesized into a second optical signal, and the second optical signal is incident on the dispersion system 23 .

The dispersion system 23 can be used to convert the wavelengths of the WDM signals in the first optical signal from the PBC 26 at the first moment. The optical signals are respectively incident on different areas along the second direction in the optical switching engine 24 . In this way, at the first moment, the optical signals of each wavelength in the first WDM signal and the fourth WDM signal are respectively incident on different areas along the second direction in the optical switching engine 24 . The dispersion system 23 can also be used to incident the optical signals of each wavelength of the WDM signal in the second optical signal from the PBC 26 to different areas along the second direction in the optical switching engine 24 at the second moment. In this way, at the second moment, the optical signals of each wavelength in the second WDM signal and the fifth WDM signal are respectively incident on different areas along the second direction in the optical switching engine 24 . For the specific content of the dispersion system 23, please refer to the description of FIGS. 2 to 8D and will not be described again here.

At the first moment, the second deflection layer in the optical switching engine 24 can transparently transmit the first WDM signal with the first polarization direction. In this way, the first WDM signal can be incident on the first deflection layer through the second deflection layer, and the optical switching engine 24 converts the first WDM signal from the dispersion system 23 at the first moment through the light field modulation pattern on the first deflection layer. The optical signal of the first wavelength in the signal is incident on the PD 201 through the second deflection layer. The first deflection layer can reflect the fourth WDM signal with the second polarization direction, and the optical switching engine 24 can incident the optical signals of each wavelength in the fourth WDM signal from the dispersion system 23 to the corresponding output port through the second deflection layer. .

At the second moment, the second deflection layer in the optical switching engine 24 can transparently transmit the second WDM signal with the first polarization direction. In this way, the second WDM signal can be incident on the first deflection layer through the second deflection layer, and the optical switching engine 24 uses the light field modulation pattern on the first deflection layer to convert the second WDM signal from the dispersion system 23 at the second moment. The optical signal of the second wavelength in the signal is incident on the PD 201 through the second deflection layer. The first deflection layer can reflect the fifth WDM signal with the second polarization direction, and the optical switching engine 24 can incident the optical signals of each wavelength in the fifth WDM signal from the dispersion system 23 to the corresponding output port through the second deflection layer. .

In the optical device shown in FIG. 11B , the optical switching engine 24 may include a first deflection layer and a second deflection layer arranged in a stack. The first deflection layer and the second deflection layer may respectively adjust the WDM signal having the first polarization direction. The transmission direction and the transmission direction of the WDM signal with the second polarization direction can reduce the size of the optical switching engine 24, thereby reducing the space occupied by the optical equipment and reducing the cost of the optical equipment.

Optionally, the optical device shown in Figure 11B can obtain linearly polarized light with different polarization directions through one of the following implementation methods.

Implementation method 1:

As shown in 10A, optical system 21 may include input port 211 and input port 213 of the optical device. The input port 211 is used to receive a WDM signal with a first polarization direction; the input port 213 is used to receive a WDM signal with a second polarization direction. For example, the input port 211 is used to receive a first WDM signal with a first polarization direction at a first time, and a second WDM signal with a first polarization direction at a second time; the input port 213 is used to receive a first WDM signal with a first polarization direction at a first time. The fourth WDM signal with the second polarization direction is received at the second time. The fifth WDM signal with the second polarization direction is received.

Optionally, in implementation mode 1, the optical switching engine 22 may be disposed between the input port 211 and the PBC 26.

Implementation method 2:

As shown in FIG. 11C , the optical system 21 includes an input port 211 and an optical splitter 215 , a polarization conversion unit 216 and a polarization conversion unit 217 .

The input port 211 can be used to receive the sixth WDM signal at the first time and incident the sixth WDM signal to the optical splitter 215; to receive the seventh WDM signal at the second time and incident the seventh WDM signal to the optical splitter 215. . For example, the input port 211 may be an input port of an optical device, and is used for receiving WDM signals incident on the optical device.

The optical splitter 215 may be used to split the WDM signal from the input port 211 . For example, the optical splitter 215 may be used to divide the sixth WDM signal from the input port 211 into an eighth WDM signal and a ninth WDM signal at the first moment, incident the eighth WDM signal to the polarization conversion unit 216, and convert the ninth WDM signal into the polarization conversion unit 216. incident to polarization inversion The conversion unit 217; at the second moment, the seventh WDM signal from the input port 211 is divided into a tenth WDM signal and an eleventh WDM signal, the tenth WDM signal is incident on the polarization conversion unit 216, and the eleventh WDM signal is incident on Polarization conversion unit 217. Optionally, the optical splitter 215 may be a beam splitter.

The polarization conversion unit 216 may be used to convert the polarization direction of the WDM signal in one signal branched out by the optical splitter 215 into a first polarization direction. For example, the polarization conversion unit 216 can be used to convert the polarization direction of the eighth WDM signal from the optical splitter 215 to the first polarization direction at the first moment to obtain the first WDM signal; and to convert the polarization direction of the eighth WDM signal from the optical splitter 215 at the second moment. The polarization direction of the tenth WDM signal is converted to the first polarization direction to obtain the second WDM signal.

The polarization conversion unit 217 may be used to convert the polarization direction of the WDM signal in the other signal branched out by the optical splitter 215 into a second polarization direction. For example, the polarization conversion unit 217 may be used to convert the polarization direction of the ninth WDM signal from the optical splitter 215 to a second polarization direction at the first moment to obtain the fourth WDM signal; and convert the polarization direction of the ninth WDM signal from the optical splitter 215 at the second moment. The polarization direction of the eleventh WDM signal is converted to the second polarization direction to obtain the fifth WDM signal.

In this way, the optical device can separate the monitoring signal and the service signal with different polarization directions from a WDM signal input to the optical device.

Optionally, the polarization conversion unit 216 and/or the polarization conversion unit 217 are polarizing plates.

In addition, in implementation mode 2, the optical switching engine 22 may be disposed between the optical splitter 215 and the PBC 26 in the optical path where the polarization conversion unit 216 is located. For example, the optical switching engine 22 is provided between the optical splitter 215 and the polarization conversion unit 216.

In addition, the optical system 21 can also perform collimation processing on the WDM signal. This is explained in detail below.

In some possible ways, as shown in FIG. 11D , based on the optical system 21 shown in FIG. 11C , the optical system 21 further includes: a collimating element 212 . The input port 211 is also used to incident the sixth WDM signal to the collimating element 212 at the first moment. The collimating element 212 is used to perform collimation processing on the sixth WDM signal from the input port 211 and then input the collimated sixth WDM signal into the optical splitter 215 . The input port 211 is also used to incident the seventh WDM signal to the collimating element 212 at the second moment. The collimating element 212 is used to perform collimation processing on the seventh WDM signal from the input port 211 and then input the collimated seventh WDM signal into the optical splitter 215 .

In other possible ways, as shown in FIG. 11E , based on the optical system 21 shown in FIG. 11C , the optical system 21 further includes: a collimating element 218 and a collimating element 219 . The optical splitter 215 is also used to incident the eighth WDM signal to the collimation element 218 at the first moment. After the collimation element 218 performs collimation processing on the eighth WDM signal from the optical splitter 215, the collimated signal is The eighth WDM signal is incident on the polarization conversion unit 216 . The optical splitter 215 is also used to incident the ninth WDM signal to the collimation element 219 at the first moment. After the collimation element 219 performs collimation processing on the ninth WDM signal from the optical splitter 215, the collimated The ninth WDM signal is incident on the polarization conversion unit 217 . The optical splitter 215 is also used to incident the tenth WDM signal to the collimation element 218 at the second moment. After the collimation element 218 performs collimation processing on the tenth WDM signal from the optical splitter 215, the collimated signal is The tenth WDM signal is incident on the polarization conversion unit 216 . The optical splitter 215 is also used to incident the eleventh WDM signal to the collimation element 219 at the second moment. After the collimation element 219 performs collimation processing on the eleventh WDM signal from the optical splitter 215, the collimation process The eleventh WDM signal is incident on the polarization conversion unit 217.

Through implementation mode 1 or implementation mode 2, the optical device can conveniently acquire the WDM signal with the first polarization direction and the WDM signal with the second polarization direction.

Optionally, as shown in FIG. 12A , based on the optical device shown in FIG. 11B , the optical device further includes: a lens 25 .

The lens 25 may be disposed between the optical switching engine 22 and the optical switching engine 24. For details, please refer to the description of FIG. 8A, and the repeated parts will not be described again.

Optionally, the optical switching engine 24 is disposed near the back focal plane of the lens 25 .

In the following, the optical system 21 is the optical system shown in FIG. 10A , the dispersion system 23 is the dispersion system shown in FIG. 7A , the first deflection layer of the optical switching engine 24 is the metasurface layer 241 , and the second deflection layer of the optical switching engine 24 For the LCOS layer 242, the first plane is the x-z plane and the second plane is the y-z plane. For the first WDM signal, the second WDM signal, the fourth WDM signal and the fifth WDM signal in the optical device shown in Figure 12A The optical path diagram is explained.

FIG. 12B shows an optical path diagram of the first WDM signal, the second WDM signal, the fourth WDM signal and the fifth WDM signal on the y-z plane in the optical device shown in FIG. 12A. As shown in Figure 12B, at the first moment, the first WDM signal can be incident into the PBC 26 through the input port 211 and the optical switching engine 22 in sequence, and the fourth WDM signal can be incident into the PBC 26 through the input port 213. After the PBC 26 synthesizes the first WDM signal from the optical switching engine 22 and the fourth WDM signal from the output port 213 into a first optical signal, the first optical signal is incident on the optical switching engine 24 through the dispersion system 23, where , the dispersion system 23 can perform dispersion processing on the first optical signal. For details, please refer to the description of Figure 7A. Similarly, at the second moment, the second WDM signal can be incident into the PBC 26 through the input port 211 and the optical switching engine 22 in sequence, and the fifth WDM signal can be incident into the PBC 26 through the input port 213. After the PBC 26 synthesizes the second WDM signal from the optical switching engine 22 and the fifth WDM signal from the output port 213 into a second optical signal, the second optical signal is incident on the optical switching engine 24 through the dispersion system 23 .

FIG. 12C shows an optical path diagram of the first WDM signal and the second WDM signal on the xz plane in the optical device shown in FIG. 12A. As shown in the upper diagram of FIG. 12C , at the first moment, the first WDM signal received through the input port 211 may be incident on the optical switching engine 22 . The optical switching engine 22 deflects the first WDM signal from the input port 211 at a certain angle and then makes it incident on the lens 25 . The first WDM signal from the optical switching engine 22 is incident on the first area corresponding to _x3 in the metasurface layer 241 after passing through the lens 25 for spot conversion. The metasurface layer 241 can modulate the light field of the first WDM signal from the lens 25 so that the optical signal of the first wavelength in the first WDM signal is deflected at a certain angle and then reflected onto the lens 25 . The lens 25 can convert the angle of the optical signal of the first wavelength from the metasurface layer 241 into a position change of the output end, so that the optical signal of the first wavelength is incident on the optical switching engine 22 . The optical switching engine 22 may deflect the first WDM signal from the lens 25 by one degree before making it incident on the PD 201 . As shown in the lower figure of Figure 12C, at the second moment, the second WDM signal can be incident into the second area corresponding to x ₄ in the metasurface layer 241 through the optical switching engine 22 and the lens 25; then, the second WDM signal The optical signal of the second wavelength may be incident on the PD 201 through the lens 25 and the optical switching engine 22 in sequence.

FIG. 12D shows an optical path diagram of the fourth WDM signal and the fifth WDM signal on the x-z plane in the optical device shown in FIG. 12A. The optical device can process the fourth WDM signal and the fifth WDM signal in the same manner. The following description takes the fourth WDM signal as an example. As shown in FIG. 12D , the fourth WDM signal received through the input port 213 is incident on the LCOS layer 242 after undergoing light spot conversion through the lens 25 . The LCOS layer 242 generates phase modulation on the fourth WDM signal from the lens 25 so that it is reflected onto the lens 25 at a set angle. The lens 25 can convert the angle of the fourth WDM signal from the LCOS layer 242 into a position change of the output port, so that the fourth WDM signal is input to the target output port. (eg, output port 27 in Figure 12D). Optionally, the fourth WDM signal may be collimated during transmission from the output port 213 to the lens 25 .

Optionally, when monitoring WDM signals through multiple PDs, at the first moment, the lens 25 can process the optical signal of the third wavelength in the first WDM signal in a similar manner to the optical signal of the first wavelength, so that The optical signal of the third wavelength is incident into the PD 202; at the second moment, the lens 25 can process the optical signal of the fourth wavelength in the second WDM signal in a similar manner to the optical signal of the second wavelength, so that the optical signal of the fourth wavelength The optical signal is incident on the PD 202, which will not be described again here.

Figure 13 shows a ROADM provided by the embodiment of the present application. The ROADM may include at least two optical devices shown in any one of Figures 9-12D. For example, as shown in Figure 13, the ROADM 1300 includes an optical device 1301 and an optical device 1302. The optical device 1301 and the optical device 1302 may be the optical devices shown in FIGS. 9-12D. Optionally, the optical device 1301 can be used to upload wavelengths, and the optical device 1302 can be used to download wavelengths.

Figure 14 shows a signal monitoring method provided by an embodiment of the present application. This method can be applied to any optical device shown in Figures 2 to 12D. Referring to Figure 14, the method includes:

S1401: At the first moment, obtain the first WDM signal through the optical system, and inject the first WDM signal into the first optical switching engine. The first WDM signal is a monitoring signal including multiple wavelength optical signals;

S1402: At the first moment, the first WDM signal from the optical system is incident on the first area in the second optical switching engine through the dispersion system; the first WDM signal from the first optical switching engine is incident on the dispersion system. Optical signals of each wavelength in a WDM signal are respectively incident on different areas along the second direction in the second optical switching engine;

S1403: Through the fixed light field modulation pattern on the second optical switching engine, the optical signal of the first wavelength in the first WDM signal from the dispersion system is incident on the first optical detector at the first moment;

S1404: At the second moment, the second WDM signal is acquired through the optical system, and the second WDM signal is incident on the first optical switching engine. The second WDM signal and the first WDM signal belong to the same optical signal, and the second WDM signal is Monitoring signals including multiple wavelength optical signals;

S1405: At the second moment, rotate the first optical switching engine so that the second WDM signal from the optical system is incident on the second area in the second optical switching engine through the dispersion system; The optical signals of each wavelength in the second WDM signal are respectively incident on different areas along the second direction in the second optical switching engine; wherein, the first area and the second area are the areas along the first direction in the second optical switching engine. In different areas, the first direction and the second direction are perpendicular;

S1406: Through the light field modulation pattern on the second optical switching engine, the optical signal of the second wavelength in the second WDM signal from the dispersion system is incident on the first optical detector at the second moment.

S1401 and S1404 can be executed by the optical system 21, S1402 and S1405 can be executed by the optical switching engine 22 (i.e., the first optical switching engine) and the dispersion system 23, and S1403 and S1406 can be executed by the optical switching engine 24 (i.e., the second optical switching engine). )implement. For the specific content of each of the above modules, please refer to the previous description and will not be repeated here.

For other contents of the above method, please refer to the previous contents about optical equipment, and will not be described again here.

The relevant parts of the various device embodiments of this application may be referred to each other; the device provided by each device embodiment is used to execute the method provided by the corresponding method embodiment, so the method embodiment may refer to the relevant parts of the relevant device embodiment. To understand.

Those of ordinary skill in the art can understand that all or part of the steps in implementing the methods of the above embodiments can be completed by instructing relevant hardware through a program. The program can be stored in a readable storage medium of a device. When the program is executed, , including all or part of the above steps, the storage medium, such as: magnetic disk storage, optical storage, etc.

The above-mentioned specific implementations further describe the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that different embodiments can be combined, and the above-mentioned are only specific implementations of the present application. , is not used to limit the scope of protection of this application. Any combination, modification, equivalent substitution, improvement, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

An optical device, characterized by comprising: an optical system, a first optical switching engine, a dispersion system, a second optical switching engine and a first optical detector;

The optical system is used to acquire a first wavelength division multiplexing WDM signal at a first moment, and incident the first WDM signal into the first optical switching engine; acquire a second WDM signal at a second moment, and The second WDM signal is incident on the first optical switching engine; wherein the first WDM signal and the second WDM signal belong to the same optical signal, and the first WDM signal and the second WDM signal The signals are all monitoring signals including multiple wavelength optical signals;

The first optical switching engine is configured to incident the first WDM signal from the optical system through the dispersion system into the first area in the second optical switching engine at the first moment; and Rotation is performed at the second moment so that the second WDM signal from the optical system is incident on the second area in the second optical switching engine through the dispersion system; wherein the first area and the The second area is a different area along the first direction in the second optical switching engine;

The dispersion system is used to respectively incident the optical signals of each wavelength in the first WDM signal from the first optical switching engine into the second optical switching engine along the second direction at the first moment. At the second moment, the optical signals of each wavelength in the second WDM signal from the first optical switching engine are respectively incident on the second optical switching engine along the second direction. Different areas; wherein the first direction and the second direction are perpendicular;

The second optical switching engine is configured to use a fixed light field modulation pattern to incident the optical signal of the first wavelength in the first WDM signal from the dispersion system to the first moment at the first moment. a light detector, and incident on the first light detector an optical signal of a second wavelength in the second WDM signal from the dispersion system at the second moment;

The first photodetector is used to detect the optical signal of the first wavelength incident on the first photodetector at the first time, and detect the optical signal incident on the third photodetector at the second time. A photodetector detects the optical signal of the second wavelength.
The optical device according to claim 1, wherein the first optical switching engine is a micro-electromechanical system (MEMS) device or a digital light processing (DLP) device.
The optical device according to claim 1 or 2, characterized in that:

The second optical switching engine is specifically configured to use the light field modulation pattern to incident the optical signal of the first wavelength in the first WDM signal from the dispersion system to the A first optical switching engine that injects the optical signal of the second wavelength in the second WDM signal from the dispersion system into the first optical switching engine at the second moment;

The first optical switching engine is also configured to incident the optical signal of the first wavelength from the second optical switching engine to the first optical detector at the first moment; at the second moment The optical signal of the second wavelength from the second optical switching engine is incident on the first optical detector.
The optical device according to any one of claims 1 to 3, wherein the dispersion system includes: a first lens, a dispersion element and a second lens,

The first lens is used to amplify the light spot of the first WDM signal from the first optical switching engine at the first moment, and to amplify the light spot from the first optical switch engine at the second moment. The light spot of the second WDM signal of the engine is amplified;

The dispersion element is used to disperse the optical signals of each wavelength in the first WDM signal from the first lens to different directions at the first moment, and to disperse the optical signals from the third WDM signal at the second moment. The optical signals of each wavelength in the second WDM signal of a lens are dispersed in different directions;

The second lens is used to incident the optical signals of each wavelength in the first WDM signal from the dispersion element into the second optical switching engine along the second direction at the first moment. Different areas, the optical signals of each wavelength in the second WDM signal from the dispersion element are incident on different areas along the second direction in the second optical switching engine at the second moment.
The optical device according to any one of claims 1 to 3, characterized in that the dispersion system includes: a dispersion element and a second lens,

The dispersion element is used to disperse the optical signals of each wavelength in the first WDM signal from the first optical switching engine to different directions at the first moment, and to disperse the optical signals from the first WDM signal at the second moment. The optical signals of each wavelength in the second WDM signal of the first optical switching engine are dispersed in different directions;

The second lens is used to incident the optical signals of each wavelength in the first WDM signal from the dispersion element into the second optical switching engine along the second direction at the first moment. Different areas, the optical signals of each wavelength in the second WDM signal from the dispersion element are incident on different areas along the second direction in the second optical switching engine at the second moment.
The optical device according to claim 4 or 5, characterized in that the dispersion element is a grating, a prism or a diffractive optical element DOE device.
The optical device according to any one of claims 1 to 6, wherein the optical device further includes a second photodetector,

The second optical switching engine is also configured to use the light field modulation pattern to incident the optical signal of the third wavelength in the first WDM signal from the dispersion system to the second light at the first moment. a detector, and incident the optical signal of the fourth wavelength in the second WDM signal from the dispersion system to the second optical detector at the second moment;

The second photodetector is configured to detect the optical signal of the third wavelength incident on the second photodetector at the first time, and detect the optical signal incident on the third wavelength at the second time. The second optical detector detects the optical signal of the fourth wavelength.
The optical device according to any one of claims 1 to 7, characterized in that the second optical switching engine is a MEMS device, a liquid crystal on silicon LCOS device, a DOE device on which the light field modulation pattern is provided, or A metasurface device on which the light field modulation pattern is disposed.
The optical device according to any one of claims 1 to 7, characterized in that:

The optical system is also used to acquire a third WDM signal and incident the third WDM signal into the dispersion system, where the third WDM signal is a service signal;

The dispersion system is also used to incident optical signals of each wavelength in the third WDM signal from the optical system into different areas along the second direction in the second optical switching engine;

The second optical switching engine includes a first deflection layer and a second deflection layer; wherein the light field modulation pattern is provided on the first deflection layer, and the first deflection layer is used to adjust the first WDM signal and the transmission direction of the second WDM signal; the second deflection layer is used to adjust the transmission direction of the third WDM signal;

The second optical switching engine is configured to convert the first WDM signal from the dispersion system at the first moment through the light field modulation pattern on the first deflection layer. The optical signal of the wavelength is incident on the first optical detector, and at the second moment, the optical signal of the second wavelength in the second WDM signal from the dispersion system is incident on the first photodetector; and configured to incident the optical signals of each wavelength in the third WDM signal from the dispersion system to the corresponding output port through the second deflection layer.
The optical device according to claim 9, characterized in that:

The first WDM signal, the second WDM signal and the third WDM signal are all linearly polarized optical signals, and the polarization directions of the first WDM signal and the second WDM signal are all the first polarization direction. , the polarization direction of the third WDM signal is the second polarization direction, and the first polarization direction is perpendicular to the second polarization direction; the third WDM signal includes a fourth WDM signal and a fifth WDM signal;

The optical device further includes: a polarization beam combiner;

The optical system is specifically configured to acquire a fourth WDM signal at the first moment and incident the fourth WDM signal into the polarization beam combiner; acquire the fifth WDM signal at the second moment, And incident the fifth WDM signal to the polarization beam combiner;

The first optical switching engine is specifically configured to sequentially pass the first WDM signal from the optical system through the polarization beam combiner and the dispersion system to the second optical switching engine at the first moment. a first area in the engine; and rotating at a second moment such that the second WDM signal from the optical system is incident on the second optical switching engine through the polarization beam combiner and the dispersion system in sequence the second area in;

The polarization beam combiner is used to combine the first WDM signal from the first optical switching engine and the fourth WDM signal from the optical system into a first optical signal at the first moment, and incident the first optical signal into the dispersion system; at the second moment, combine the second WDM signal from the first optical switching engine and the fifth WDM signal from the optical system The signal is synthesized into a second optical signal, and the second optical signal is incident on the dispersion system;

The dispersion system is specifically configured to incident the optical signals of each wavelength of the WDM signal in the first optical signal from the polarization beam combiner into the second optical switching engine at the first moment. Different areas in the second direction; at the second moment, the optical signals of each wavelength of the WDM signal in the second optical signal from the polarization beam combiner are respectively incident on the second optical switching engine. different areas along the second direction;

The first deflection layer and the second deflection layer are stacked layers; the first deflection layer is used to adjust the transmission direction of the optical signal in the first polarization direction, and the second deflection layer is used to adjust the The transmission direction of the optical signal in the second polarization direction.
The optical device according to claim 10, wherein the optical system includes: an input port, an optical splitter, a first polarization conversion unit and a second polarization conversion unit;

The input port is configured to receive a sixth WDM signal at the first time and incident the sixth WDM signal to the optical splitter; to receive a seventh WDM signal at the second time and transmit the sixth WDM signal to the optical splitter; The seventh WDM signal is incident on the optical splitter;

The optical splitter is used to divide the sixth WDM signal from the input port into the eighth WDM signal and the ninth WDM signal at the first moment, and divide the eighth WDM signal into is incident on the first polarization conversion unit, and the ninth WDM signal is incident on the second polarization conversion unit; at the second moment, the seventh WDM signal from the input port is divided into the ten WDM signals and the eleventh WDM signal, and the tenth WDM signal is incident on the first polarization conversion unit, and the eleventh WDM signal is incident on the second polarization conversion unit;

The first polarization conversion unit is configured to convert the polarization direction of the eighth WDM signal from the optical splitter to the first polarization direction at the first moment to obtain the first WDM signal; At the second moment, the polarization direction of the tenth WDM signal from the optical splitter is converted to the first polarization direction to obtain the second WDM signal;

The second polarization conversion unit is configured to convert the polarization direction of the ninth WDM signal from the optical splitter to the second polarization direction at the first moment to obtain the fourth WDM signal; At the second moment, the polarization direction of the eleventh WDM signal from the optical splitter is converted to the second polarization direction to obtain the fifth WDM signal.
The optical device according to any one of claims 9 to 11, wherein the first deflection layer is a metasurface layer on which the light field modulation pattern is provided, and the second deflection layer is an LCOS layer. .
A reconfigurable optical branch multiplexer, characterized by including at least two optical devices according to any one of claims 9-12.
A signal monitoring method, characterized by including:

At the first moment, the first wavelength division multiplexing WDM signal is acquired through the optical system, and the first WDM signal is incident on the first optical switching engine. The first WDM signal is a monitoring signal including multiple wavelength optical signals. ;

At the first moment, the first WDM signal from the optical system is incident to the first area in the second optical switching engine through the dispersion system through the first optical switching engine; The optical signals of each wavelength in the first WDM signal from the first optical switching engine are respectively incident on different areas along the second direction in the second optical switching engine;

Through the fixed light field modulation pattern on the second optical switching engine, the optical signal of the first wavelength in the first WDM signal from the dispersion system is incident on the first optical detector at the first moment;

At the second moment, a second WDM signal is acquired through the optical system, and the second WDM signal is incident on the first optical switching engine. The second WDM signal and the first WDM signal belong to the same path. Optical signal, the second WDM signal is a monitoring signal including multiple wavelength optical signals;

At the second moment, the first optical switching engine is rotated so that the second WDM signal from the optical system is incident on the second area in the second optical switching engine through the dispersion system; by The dispersion system separately injects the optical signals of each wavelength in the second WDM signal from the first optical switching engine into different areas along the second direction in the second optical switching engine; wherein, The first area and the second area are different areas along a first direction in the second optical switching engine, and the first direction and the second direction are perpendicular;

Through the light field modulation pattern on the second optical switching engine, the optical signal of the second wavelength in the second WDM signal from the dispersion system is incident on the first light at the second moment. detector.
The method of claim 14, wherein the first optical switching engine is a micro-electromechanical system (MEMS) device or a digital light processing (DLP) device.
The method according to claim 14 or 15, characterized in that,

Through the fixed light field modulation pattern on the second optical switching engine, the optical signal of the first wavelength in the first WDM signal from the dispersion system is incident on the first optical detector at the first moment, The method includes: using the light field modulation pattern to incident the optical signal of the first wavelength from the dispersion system onto the first optical switching engine at the first moment; using the first optical switching engine , incident the optical signal of the first wavelength from the second optical switching engine to the first optical detector;

Through the light field modulation pattern on the second optical switching engine, the optical signal of the second wavelength in the second WDM signal from the dispersion system is incident on the first light at the second moment. a detector including: passing the light field A modulation pattern that causes the optical signal of the second wavelength from the dispersion system to be incident on the first optical switching engine at the second moment; through the first optical switching engine, the optical signal from the second wavelength is incident on the first optical switching engine. The optical signal of the second wavelength of the optical switching engine is incident on the first optical detector.
The method according to any one of claims 14 to 16, wherein the dispersion system includes: a first lens, a dispersion element and a second lens,

The optical signals of each wavelength in the first WDM signal from the first optical switching engine are respectively incident on different areas along the second direction in the second optical switching engine through the dispersion system, including: The first lens amplifies the light spot of the first WDM signal from the first optical switching engine; through the dispersion element, each of the first WDM signals from the first lens is Optical signals of wavelengths are dispersed in different directions; through the second lens, optical signals of each wavelength in the first WDM signal from the dispersion element are incident into the second optical switching engine along the first Different areas in two directions;

The optical signals of each wavelength in the second WDM signal from the first optical switching engine are respectively incident on different areas along the second direction in the second optical switching engine through the dispersion system, including : The light spot of the second WDM signal from the first optical switching engine is amplified through the first lens; the second WDM signal from the first lens is amplified through the dispersion element. The optical signals of each wavelength in the second WDM signal are dispersed in different directions; through the second lens, the optical signals of each wavelength in the second WDM signal from the dispersion element are incident on all edges of the second optical switching engine. different areas in the second direction.
The method according to any one of claims 14 to 16, characterized in that the dispersion system includes: a dispersion element and a second lens,

The optical signals of each wavelength in the first WDM signal from the first optical switching engine are respectively incident on different areas along the second direction in the second optical switching engine through the dispersion system, including: The dispersive element disperses the optical signals of each wavelength in the first WDM signal from the first optical switching engine to different directions; through the second lens, the third optical signal from the dispersive element is Optical signals of each wavelength in a WDM signal are incident on different areas in the second optical switching engine along the second direction;

The optical signals of each wavelength in the second WDM signal from the first optical switching engine are respectively incident on different areas along the second direction in the second optical switching engine through the dispersion system, including : The optical signals of each wavelength in the second WDM signal from the first optical switching engine are dispersed in different directions through the dispersion element; all the optical signals from the dispersion element are dispersed through the second lens. The optical signals of each wavelength in the second WDM signal are incident on different areas in the second optical switching engine along the second direction.
The method according to claim 17 or 18, characterized in that the dispersion element is a grating, a prism or a diffractive optical element DOE device.
The method according to any one of claims 14-19, characterized in that the method further includes:

At the first moment, the optical signal of the third wavelength in the first WDM signal from the dispersion system is incident on the second optical detector through the light field modulation pattern on the second optical switching engine;

At the second moment, the optical signal of the fourth wavelength in the second WDM signal from the dispersion system is incident on the second optical detector through the light field modulation pattern on the second optical switching engine. device.
The method according to any one of claims 14 to 20, characterized in that the second optical switching engine is a MEMS device, a liquid crystal on silicon LCOS device, a DOE device on which the light field modulation pattern is provided, or other devices thereof. A metasurface device provided with the light field modulation pattern.
The method according to any one of claims 14-20, characterized in that,

The method further includes: acquiring a third WDM signal through the optical system, and incident the third WDM signal into the dispersion system, where the third WDM signal is a service signal;

Inject the optical signals of each wavelength in the third WDM signal into different areas along the second direction in the second optical switching engine through the dispersion system;

The second optical switching engine includes a first deflection layer and a second deflection layer; wherein the light field modulation pattern is provided on the first deflection layer, and the first deflection layer is used to adjust the first WDM signal and the transmission direction of the second WDM signal, and the second deflection layer is used to adjust the transmission direction of the third WDM signal; through the second deflection layer, the third WDM signal from the dispersion system is The optical signals of each wavelength in the WDM signal are incident on the corresponding output port;

Through the fixed light field modulation pattern on the second optical switching engine, the optical signal of the first wavelength in the first WDM signal from the dispersion system is incident on the first optical detector at the first moment, It includes: incident on the first optical detector the optical signal of the first wavelength from the dispersion system at the first moment through the light field modulation pattern on the first deflection layer;

Through the light field modulation pattern on the second optical switching engine, the optical signal of the second wavelength in the second WDM signal from the dispersion system is incident on the first light at the second moment. The detector includes: incident on the first optical detector the optical signal of the second wavelength from the dispersion system at the second moment through the light field modulation pattern on the first deflection layer. device.
The method of claim 22, wherein:

The first WDM signal, the second WDM signal and the third WDM signal are all linearly polarized optical signals, and the polarization directions of the first WDM signal and the second WDM signal are the first polarization direction, The polarization direction of the third WDM signal is a second polarization direction, and the first polarization direction is perpendicular to the second polarization direction; the third WDM signal includes a fourth WDM signal and a fifth WDM signal;

The first deflection layer and the second deflection layer are stacked layers; the first deflection layer is used to adjust the transmission direction of the optical signal in the first polarization direction, and the second deflection layer is used to adjust the The transmission direction of the optical signal in the second polarization direction;

At the first moment, acquiring the third WDM signal through the optical system includes: at the first moment, acquiring the fourth WDM signal through the optical system, and incident the fourth WDM signal into polarization beam combiner;

At the first moment, the first WDM signal from the optical system is incident through the dispersion system to the first area in the second optical switching engine through the first optical switching engine, including: At a moment, the first WDM signal from the optical system is incident on the first optical signal in the second optical switching engine through the polarization beam combiner and the dispersion system through the first optical switching engine. area;

The method further includes: at the first moment, combining the first WDM signal from the first optical switching engine and the fourth WDM signal from the optical system through the polarization beam combiner is the first optical signal, and the first optical signal is incident on the dispersion system; at the first moment, the first optical signal from the polarization beam combiner is passed through the dispersion system The optical signals of each wavelength of the WDM signal in the signal are respectively incident on different areas along the second direction in the second optical switching engine;

At the second moment, acquiring the third WDM signal through the optical system includes: at the second moment, acquiring the fifth WDM signal through the optical system and incident on the fifth WDM signal. The polarization beam combiner;

At the second moment, the first optical switching engine is rotated so that the second WDM signal from the optical system is incident on the second area in the second optical switching engine through the dispersion system, including : At the second moment, rotate the first optical exchange engine so that the second WDM signal of the optical system is incident on the second optical exchange through the polarization beam combiner and the dispersion system in sequence Second zone in the engine;

The method further includes: at the second moment, combining the second WDM signal from the first optical switching engine and the fifth WDM signal from the optical system through the polarization beam combiner is a second optical signal, and the second optical signal is incident on the dispersion system; at the second moment, the second optical signal from the polarization beam combiner is passed through the dispersion system The optical signals of each wavelength of the WDM signal in the signal are respectively incident on different areas along the second direction in the second optical switching engine.
The method of claim 23, wherein the optical system includes: an input port, an optical splitter, a first polarization conversion unit and a second polarization conversion unit;

At the first moment, acquiring the fourth WDM signal through the optical system includes: at the first moment, receiving a sixth WDM signal through the input port and incident on the sixth WDM signal. The optical splitter: split the sixth WDM signal from the input port into the eighth WDM signal and the ninth WDM signal through the optical splitter, and incident the eighth WDM signal to The first polarization conversion unit injects the ninth WDM signal into the second polarization conversion unit; and converts the polarization direction of the eighth WDM signal from the optical splitter through the first polarization conversion unit. Convert to the first polarization direction to obtain the first WDM signal; convert the polarization direction of the ninth WDM signal from the optical splitter to the second polarization direction through the second polarization conversion unit , obtain the fourth WDM signal;

At the second moment, acquiring the fifth WDM signal through the optical system includes: at the second moment, receiving a seventh WDM signal through the input port, and incident the seventh WDM signal into The optical splitter; splitting the seventh WDM signal from the input port into the tenth WDM signal and the eleventh WDM signal through the optical splitter, and incident the tenth WDM signal to the first polarization conversion unit, and the eleventh WDM signal is incident on the second polarization conversion unit; through the first polarization conversion unit, the tenth WDM signal from the optical splitter is The polarization direction is converted to the first polarization direction to obtain the second WDM signal; the polarization direction of the eleventh WDM signal from the optical splitter is converted to the third WDM signal through the second polarization conversion unit. Two polarization directions are used to obtain the fifth WDM signal.
The method according to any one of claims 22 to 24, wherein the first deflection layer is a metasurface layer on which the light field modulation pattern is provided, and the second deflection layer is an LCOS layer.