Optical switch and optical performance monitoring method based on optical switch

Patent metadata

Field	Value
Publication number	US-11962352-B2
Application number	US-202217933166-A
Country	US
Kind code	B2
Filing date	Sep 19, 2022
Priority date	Mar 20, 2020
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Embodiments of this application disclose an optical switch. The optical switch includes at least one first port, at least one second port, a first wavelength division multiplexing WDM apparatus, an optical splitter, an optical monitoring apparatus, and an optical switching apparatus. The first port is configured to transmit an input first optical signal to the first WDM apparatus, where the first optical signal is a multi-wavelength signal. The first WDM apparatus is configured to demultiplex the first optical signal. The optical splitter is configured to split a demultiplexed first optical signal to obtain a first sub-signal and a second sub-signal. The optical switching apparatus is configured to perform optical switching on the first sub-signal. The second port is configured to output a first sub-signal obtained after optical switching. The optical monitoring apparatus is configured to perform optical performance monitoring on the second sub-signal.

First claim

What is claimed is:

1. A device, comprising:
a first wavelength division multiplexer (WDM);
a first port, configured to transmit an input first optical signal to the first WDM, wherein the first optical signal is a multi-wavelength signal;
a second port;
an optical splitter;
an optical monitor;
an optical switch; and
a second WDM, wherein the optical splitter and the optical switch are disposed along an optical path between the first WDM and the second WDM;
wherein the first WDM is configured to demultiplex the first optical signal, to obtain a demultiplexed first optical signal, wherein the demultiplexed first optical signal comprises multiple spatially separated wavelength signals;
wherein the optical splitter is configured to split the demultiplexed first optical signal to obtain a first sub-signal and a second sub-signal, wherein a quantity of spatially separated wavelength signals in the second sub-signal is the same as that in the demultiplexed first optical signal;
wherein the optical switch is configured to perform optical switching on the first sub-signal;
wherein the second WDM is configured to multiplex the first sub-signal obtained after optical switching, to obtain a multiplexed first sub-signal;
wherein the second port is configured to output the multiplexed first sub-signal; and
wherein the optical monitor is configured to perform optical performance monitoring on the second sub-signal.

2. The device according to claim 1 , wherein spots of the first sub-signal distributed on the optical switch are the same as spots of the second sub-signal distributed on the optical monitor.

3. The device according to claim 1 , further comprising:
a first optical element, configured to shape the input first optical signal, to obtain a shaped first optical signal, wherein the first optical element is a lens combination or a diffractive optical element; and
wherein the first WDM is configured to demultiplex the shaped first optical signal.

4. The device according to claim 3 , further comprising:
a second optical element, configured to perform beam collimation on the demultiplexed first optical signal, to obtain a beam-collimated first optical signal, wherein the second optical element is a lens combination or a diffractive optical element; and
wherein the optical splitter is configured to split the beam-collimated first optical signal, to obtain the first sub-signal and the second sub-signal.

5. The device according to claim 1 , wherein:
the second port is further configured to transmit an input second optical signal to the second WDM, wherein the second optical signal is a multi-wavelength signal;
the second WDM is further configured to demultiplex the second optical signal, to obtain a demultiplexed second optical signal, wherein the demultiplexed second optical signal comprises multiple spatially separated wavelength signals;
the optical switch is further configured to perform optical switching on the demultiplexed second optical signal;
the optical splitter is further configured to split a second optical signal obtained after optical switching to obtain a third sub-signal and a fourth sub-signal;
the first WDM is further configured to multiplex the third sub-signal, to obtain a multiplexed third sub-signal;
the first port is further configured to output the multiplexed third sub-signal; and
the optical monitor is configured to perform optical performance monitoring on the fourth sub-signal.

6. The device according to claim 1 , wherein the optical monitor is configured to:
monitor optical power of each wavelength signal in the second sub-signal.

7. The device according to claim 1 , wherein the optical monitor is configured to:
monitor a frequency offset of each wavelength signal in the second sub-signal.

8. The device according to claim 1 , wherein:
the optical monitor comprises a photodiode array (PDA), a charge coupled device (CCD), or a complementary metal-oxide-semiconductor CMOS;
the first WDM comprises a grating; and
the optical switch comprises a liquid crystal on silicon (LCOS) or a micro-electro-mechanical system (MEMS).

9. A device, comprising:
a first wavelength division multiplexer (WDM);
a first port, configured to transmit an input first optical signal to the first WDM, wherein the first optical signal is a multi-wavelength signal;
a second port;
an optical splitter;
an optical monitor;
an optical switch; and
a second WDM, wherein the optical splitter and the optical switch are disposed along an optical path between the first WDM and the second WDM;
wherein the first WDM is configured to demultiplex the first optical signal, to obtain a demultiplexed first optical signal, wherein the demultiplexed first optical signal comprises multiple spatially separated wavelength signals;
wherein the optical switch is configured to perform optical switching on the demultiplexed first optical signal;
wherein the optical splitter is configured to split a first optical signal obtained after optical switching to obtain a first sub-signal and a second sub-signal;
wherein the second WDM is configured to multiplex the first sub-signal obtained after optical switching, to obtain a multiplexed first sub-signal;
wherein the second port is configured to output the multiplexed first sub-signal; and
wherein the optical monitor is configured to perform optical performance monitoring on the second sub-signal.

10. The device according to claim 9 , wherein spots of the first optical signal distributed on the optical switch are the same as spots of the second sub-signal distributed on the optical monitor.

11. The device according to claim 9 , wherein:
the second port is further configured to transmit an input second optical signal to the second WDM, wherein the second optical signal is a multi-wavelength signal;
the second WDM is further configured to demultiplex the second optical signal, to obtain a demultiplexed second optical signal, wherein the demultiplexed second optical signal comprises multiple spatially separated wavelength signals;
the optical splitter is further configured to split the demultiplexed second optical signal to obtain a third sub-signal and a fourth sub-signal;
the optical switch is further configured to perform optical switching on the third sub-signal;
the first port is further configured to output a third sub-signal obtained after optical switching; and
the optical monitor is further configured to perform optical performance monitoring on the fourth sub-signal.

12. The device according to claim 9 , further comprising:
a first optical element, configured to shape the input first optical signal, to obtain a shaped first optical signal, wherein the first optical element is a lens combination or a diffractive optical element; and
wherein the first WDM is configured to demultiplex the shaped first optical signal.

13. The device according to claim 12 , further comprising:
a second optical element, configured to perform beam collimation on the demultiplexed first optical signal, to obtain a beam-collimated first optical signal, wherein the second optical element is a lens combination or a diffractive optical element; and
wherein the optical splitter is configured to split the beam-collimated first optical signal, to obtain the first sub-signal and the second sub-signal.

14. The device according to claim 9 , wherein:
the optical monitor comprises a photodiode array (PDA), a charge coupled device (CCD), or a complementary metal-oxide-semiconductor CMOS;
the first WDM comprises a grating; and
the optical switch comprises a liquid crystal on silicon (

Assignees

• Huawei Tech Co Ltd

Inventors

• Wang Liang
• Meng Yan
• Tang Jiang

Classifications

• H04B10/614 Primary

  comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers (H04J14/06 takes precedence) · CPC title

• H04J14/0202 Primary

  Arrangements therefor · CPC title

• H04J14/0215

  Architecture aspects · CPC title

• G02B6/29391 Primary

  Power equalisation of different channels, e.g. power flattening · CPC title

• H04Q11/0005

  Switch and router aspects · CPC title