Wavelength selective switch and optical signal transmission system

• US 10,187,173 B2
• Filed: 11/28/2017
• Issued: 01/22/2019
• Est. Priority Date: 11/29/2016
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Liu, Heliang, Zhang, Binghua, Lian, Junzi
• Primary Examiner(s): Wolf, Darren E
• Application Number:
  US15/824,126
• Publication Number:
  US 20180152259A1
• Time in Patent Office: 420 Days
• Field of Search: None
• CPC Class Codes: G02B 6/0208 characterised by their structure, wavelength response G02B6/02114, G02B6/02171, G02B6/02195 take precedence; multiple layer cores or claddings G02B6/036, protective coverings G02B6/4429
• CPC Class Codes: G02B 6/29317 Light guides of the optical fibre type
• CPC Class Codes: G02B 6/29383 Adding and dropping
• CPC Class Codes: G02B 6/3518 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 Class Codes: G02B 6/356 in an optical cross-connect device, e.g. routing and switching aspects of interconnecting different paths propagating different wavelengths to (re)configure the various input and output links switching polarized beams G02B6/3594; power equalizers G02B6/356 and G02B6/3594; path selecting means H04Q11/0001
• CPC Class Codes: G02F 2203/585 Add/drop devices
• CPC Class Codes: H04B 10/073 using an out-of-service signal H04B10/071 takes precedence
• CPC Class Codes: H04B 10/0779 Monitoring line transmitter or line receiver equipment
• CPC Class Codes: H04B 10/07957 Monitoring or measuring wavelength
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 2011/0083 Testing; Monitoring

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.

Claims

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

a service optical signal transmitted by a service laser is input to the first wavelength selective switch, a first monitoring optical signal transmitted by a first monitoring laser is input to the first wavelength selective switch, and after being successively processed by the first wavelength selective switch, the optical signal connection module or the optical signal processing module, and the second wavelength selective switch, the service optical signal is output by using the second wavelength selective switch,

wherein the first wavelength selective switch and the second wavelength selective switch are 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.

12. The optical signal transmission system according to claim 11, wherein the optical signal transmission system further comprises a first optical detector and a first monitoring module, wherein

the first optical detector is configured to:

obtain, from the first wavelength selective switch, a first monitoring optical signal processed by the first wavelength selective switch, and perform optical power detection on the first monitoring optical signal processed by the first wavelength selective switch, to obtain a first optical power detection value of the first monitoring optical signal; and

the first monitoring module is configured to;

obtain the first optical power detection value of the first monitoring optical signal from the first optical detector, obtain a flare central location of the first monitoring optical signal according to the first optical power detection value of the first monitoring optical signal, compare the flare central location of the first monitoring optical signal with a preset flare central initial location, to determine a central frequency offset of the first wavelength selective switch, and compensate for the central frequency offset of the first wavelength selective switch.

13. The optical signal transmission system according to claim 11, wherein the first monitoring module is further configured to:

obtain a first optical power detection value of the first monitoring optical signal from the first optical detector, and compare the first optical power detection value of the first monitoring optical signal with an optical power initial value of the first monitoring optical signal that is input to the first wavelength selective switch, to determine an insertion loss of the first wavelength selective switch.

14. The optical signal transmission system according to claim 11, wherein the optical signal transmission system further comprises a second optical detector and a second monitoring module, wherein

the second optical detector is configured to:

obtain, from the second wavelength selective switch, a second monitoring optical signal processed by the second wavelength selective switch, wherein the second monitoring optical signal is transmitted to the second wavelength selective switch by a second monitoring laser, and perform optical power detection on the second monitoring optical signal processed by the second wavelength selective switch, to obtain an optical power detection value of the second monitoring optical signal; and

the second monitoring module is configured to;

obtain the optical power detection value of the second monitoring optical signal from the second optical detector, and compare the optical power detection value of the second monitoring optical signal with an optical power initial value of the second monitoring optical signal that is input to the second wavelength selective switch, to determine an insertion loss of the second wavelength selective switch.

15. The optical signal transmission system according to claim 14, wherein when the optical signal transmission system further comprises the first optical detector and the first monitoring module, the first monitoring module establishes a communication connection to the second monitoring module;

the first monitoring module is further configured to send the insertion loss of the first wavelength selective switch to the second monitoring module;

the second optical detector is further configured to;

obtain, from the second wavelength selective switch, a first monitoring optical signal that is successively processed by the first wavelength selective switch, the optical signal connection module or the optical signal processing module, and the second wavelength selective switch, and perform optical power detection on the first monitoring optical signal that is successively processed by the first wavelength selective switch, the optical signal connection module or the optical signal processing module, and the second wavelength selective switch, to obtain a second optical power detection value of the first monitoring optical signal; and

the second monitoring module is further configured to;

obtain, from the first optical detector, the second optical power detection value of the first monitoring optical signal, compare the second optical power detection value of the first monitoring optical signal with the optical power initial value of the first monitoring optical signal that is input to the first wavelength selective switch, to determine a total insertion loss of the first monitoring optical signal, wherein the total insertion loss of the first monitoring optical signal comprises an insertion loss that is generated after processing performed by the first wavelength selective switch, the optical signal connection module or the optical signal processing module, and the second wavelength selective switch, and calculate an insertion loss of the optical signal connection module or the optical signal processing module according to the total insertion loss of the first monitoring optical signal, the insertion loss of the first wavelength selective switch, and the insertion loss of the second wavelength selective switch.