Wavelength selective switch and optical signal transmission system

Patent metadata

Field	Value
Publication number	US-10187173-B2
Application number	US-201715824126-A
Country	US
Kind code	B2
Filing date	Nov 28, 2017
Priority date	Nov 29, 2016
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

In the wavelength selective switch provided in the present invention, at least one optical element is successively arranged in the wavelength selective switch according to a sequence of processing optical signals. The at least one optical element receives a service optical signal from a service laser, receives a monitoring optical signal from a monitoring laser, and performs same optical signal processing on the service optical signal and the monitoring optical signal according to a processing function of the at least one optical element, where a wavelength of the service optical signal and a wavelength of the monitoring optical signal are different. A service optical signal processed by the at least one optical element and a monitoring optical signal processed by at least one optical element are output, where the monitoring optical signal processed by the at least one optical element is used for monitoring performance of the wavelength selective switch.

First claim

What is claimed is:

1. A wavelength selective switch, wherein at least one optical element is disposed in the wavelength selective switch, and the at least one optical element is successively arranged in the wavelength selective switch according to a sequence of processing optical signals;
a service optical signal transmitted by a service laser and a monitoring optical signal transmitted by a monitoring laser are separately input to the at least one optical element, and a wavelength of the service optical signal and a wavelength of the monitoring optical signal are different;
the at least one optical element is configured to: receive the service optical signal from the service laser, receive the monitoring optical signal from the monitoring laser, and perform same optical signal processing on the service optical signal and the monitoring optical signal according to a processing function of the at least one optical element, to obtain the service optical signal processed by the at least one optical element and the monitoring optical signal processed by the at least one optical element; and the service optical signal processed by the at least one optical element and the monitoring optical signal processed by the at least one optical element are output, wherein the monitoring optical signal processed by the at least one optical element is used for monitoring performance of the wavelength selective switch.

2. The wavelength selective switch according to claim 1 , wherein the wavelength selective switch comprises a first input port and a second input port;
the first input port and the second input port are separately connected to a first optical element of the at least one optical element; and
the service optical signal transmitted by the service laser is input to the first optical element of the at least one optical element by using the first input port, and the monitoring optical signal transmitted by the monitoring laser is input to the first optical element of the at least one optical element by using the second input port.

3. The wavelength selective switch according to claim 1 , wherein the wavelength selective switch has an input port, a first optical element of the at least one optical element is connected to the input port, and the input port is connected to an optical filter;
the service optical signal transmitted by the service laser and the monitoring optical signal transmitted by the monitoring laser are separately input to the optical filter; and
the optical filter is configured to: after receiving the service optical signal and the monitoring optical signal, send the service optical signal and the monitoring optical signal to the first optical element of the at least one optical element by using the input port.

4. The wavelength selective switch according to claim 1 , wherein the wavelength selective switch comprises a first output port and a second output port, and a last optical element of the at least one optical element is connected to the first output port and the second output port; and
the service optical signal processed by the at least one optical element is output by using the first output port, and the monitoring optical signal processed by the at least one optical element is output by using the second output port.

5. The wavelength selective switch according to claim 1 , wherein the wavelength selective switch has an output port, and a last optical element of the at least one optical element is connected to the output port; and
the service optical signal processed by the at least one optical element and the monitoring optical signal processed by the at least one optical element are output by using the output port.

6. The wavelength selective switch according to claim 5 , wherein the output port of the wavelength selective switch is connected to an optical signal connection module, or the output port of the wavelength selective switch is connected to an optical signal processing module;
the optical signal connection module or the optical signal processing module is connected to an optical filter; and
the optical filter is configured to: receive, from the optical signal connection module, the service optical signal and the monitoring optical signal that are output by the optical signal connection module, or receive, from the optical signal processing module, the service optical signal and the monitoring optical signal that are processed by the optical signal processing module, split the received service optical signal from the received monitoring optical signal, and output the split monitoring optical signal.

7. The wavelength selective switch according to claim 1 , wherein the wavelength selective switch further comprises a optical detector and a monitoring module, the optical detector is connected to the last optical element of the at least one optical element, and the monitoring module is connected to the optical detector;
the optical detector is configured to perform optical power detection on the monitoring optical signal processed by the at least one optical element, to obtain an optical power detection value of the monitoring optical signal; and
the monitoring module is configured to: obtain the optical power detection value of the monitoring optical signal from the optical detector, obtain a flare central location of the monitoring optical signal according to the optical power detection value of the monitoring optical signal, compare the flare central location of the monitoring optical signal with a preset flare central initial location, to determine a central frequency offset of the wavelength selective switch, and compensate for the central frequency offset of the wavelength selective switch.

8. The wavelength selective switch according to claim 7 , wherein the monitoring module is further configured to send a frequency offset prompt message when the central frequency offset exceeds a frequency offset threshold.

9. The wavelength selective switch according to claim 7 , wherein the monitoring module is further configured to: obtain the optical power detection value of the monitoring optical signal from the optical detector, and compare the optical power detection value of the monitoring optical signal with an optical power initial value of the monitoring optical signal that is input to the wavelength selective switch, to determine an insertion loss of the wavelength selective switch.

10. The wavelength selective switch according to claim 9 , wherein the monitoring module is further configured to send an insertion loss prompt message when the insertion loss exceeds an insertion loss threshold.

11. An optical signal transmission system, wherein the optical signal transmission system comprises a first wavelength selective switch, a second wavelength selective switch, and an optical signal connection module, or the optical signal transmission system comprises a first wavelength selective switch, a second wavelength selective switch, and an optical signal processing module;
the optical signal connection module is separately connected to the first wavelength selective switch and the second wavelength selective switch, or the optical signal processing module is separately connected to the first wavelength selective switch and the second wavelength selective switch;
the optical signal connection module is connected to the first wavelength selective switch by using a first fiber, and is connected to the second wavelength selective switch by using a second fiber, or the optical signal processing module is connected to the first wavelength selective switch by using a first fiber, and is connected to the second wavelength selective switch by using a second fiber; and
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Assignees

• Huawei Tech Co Ltd

Inventors

• Liu Heliang
• Zhang Binghua
• Lian Junzi

Classifications

• H04Q11/0005

  Switch and router aspects · CPC title

• H04Q2011/0083

  Testing; Monitoring · CPC title

• G02B6/3586 Primary

  Control or adjustment details, e.g. calibrating (testing optical equipment G01M11/00) · CPC title

• H04B10/073 Primary

  using an out-of-service signal (H04B10/071 takes precedence) · CPC title

• G02B6/3518

  the reflective optical element being an intrinsic part of a MEMS device, i.e. fabricated together with the MEMS device (MEMS devices in general B81B; manufacture of MEM devices in general B81C; micromechanical devices controlling the direction of light G02B26/0833) · CPC title