Method and apparatus for determining gain of raman optical amplifier and raman optical amplifier

• US 9,768,582 B2
• Filed: 07/21/2016
• Issued: 09/19/2017
• Est. Priority Date: 01/22/2014
• 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: Huang, Yansui, Zhou, Enbo
• Primary Examiner(s): BOLDA, ERIC L
• Application Number:
  US15/216,415
• Publication Number:
  US 20160329678A1
• Time in Patent Office: 425 Days
• Field of Search: None
• CPC Class Codes: H01S 2301/02 ASE (amplified spontaneous emission), noise; Reduction thereof
• CPC Class Codes: H01S 3/06754 Fibre amplifiers H01S3/06708 takes precedence
• CPC Class Codes: H01S 3/094096 Multi-wavelength pumping
• CPC Class Codes: H01S 3/13013 by controlling the optical pumping
• CPC Class Codes: H01S 3/1302 by all-optical means, e.g. gain-clamping
• CPC Class Codes: H01S 3/1305 Feedback control systems
• CPC Class Codes: H01S 3/1306 Stabilisation of the amplitude
• CPC Class Codes: H01S 3/1312 by controlling the optical pumping
• CPC Class Codes: H01S 3/30 using scattering effects, e.g. stimulated Brillouin or Raman effects
• CPC Class Codes: H01S 3/302 in an optical fibre
• CPC Class Codes: H04B 10/079 using measurements of the data signal
• CPC Class Codes: H04B 10/2916 using Raman or Brillouin amplifiers
• CPC Class Codes: H04B 10/2931 using AGC H04B10/294 takes precedence

Abstract

The embodiments of the present invention disclose a method and an apparatus for determining a gain of a Raman optical amplifier and a Raman optical amplifier. The method includes: acquiring present gain parameter information of a Raman optical amplifier; and determining a present gain of a monitoring channel of the Raman optical amplifier according to the present gain parameter information and a correspondence between a gain of the monitoring channel of the Raman optical amplifier and gain parameter information. According to the method and apparatus for determining a gain of a Raman optical amplifier and the Raman optical amplifier that are in embodiments of the present invention, a present gain of a monitoring channel can be accurately determined; therefore, a gain spectrum of the Raman optical amplifier can be accurately monitored, and the gain of the Raman optical amplifier can be accurately adjusted to a target gain.

Claims

1. A method for determining a gain of a Raman optical amplifier, wherein the method comprises:

establishing a correspondence between a gain of at least one monitoring channel of the Raman optical amplifier and gain parameter information;

wherein the at least one monitoring channel comprises at least one of a transmission channel corresponding to an output-power peak value and an output-power trough value of the Raman optical amplifier;

acquiring present gain parameter information of a Raman optical amplifier, wherein the present gain parameter information comprises out-of-band amplified spontaneous emission (ASE) noise power information of ASE noise generated by the Raman optical amplifier, pump light power information of at least one pump source of the Raman optical amplifier, and power information of an output signal of the Raman optical amplifier; and

determining a present gain of a monitoring channel of the Raman optical amplifier according to the present gain parameter information and the correspondence between the gain of the at least one monitoring channel of the Raman optical amplifier and the gain parameter information;

wherein the monitoring channel of the Raman optical amplifier is comprised in the at least one monitoring channel, and the present gain parameter information is included in the gain parameter information.

2. The method according to claim 1, wherein the out-of-band amplified spontaneous emission (ASE) noise power information comprises at least one of a short-wave side out-of-band ASE noise power, a long-wave side out-of-band ASE noise power, and a total out-of-band ASE noise power;

and

the pump light power information of the at least one pump source comprises at least one of a drive voltage of the at least one pump source, a drive current of the at least one pump source, and a power of output pump light of the at least one pump source.

3. The method according to claim 1, wherein the out-of-band amplified spontaneous emission (ASE) noise power information comprises a short-wave side out-of-band ASE noise power and a long-wave side out-of-band ASE noise power;

the pump light power information of the at least one pump source comprises a power of output pump light of the at least one pump source; and

in the correspondence, each combination of the short-wave side out-of-band ASE noise power, the long-wave side out-of-band ASE noise power, the power of the output pump light of the at least one pump source, and the power information of the output signal corresponds to one gain of the monitoring channel.

4. The method according to claim 1, wherein the out-of-band amplified spontaneous emission (ASE) noise power information comprises a short-wave side out-of-band ASE noise power and a long-wave side out-of-band ASE noise power;

the pump light power information of the at least one pump source comprises a drive voltage of the at least one pump source; and

in the correspondence, each combination of the short-wave side out-of-band ASE noise power, the long-wave side out-of-band ASE noise power, the drive voltage of the at least one pump source, and the power information of the output signal corresponds to one gain of the monitoring channel.

5. The method according to claim 1, wherein the out-of-band amplified spontaneous emission (ASE) noise power information comprises a short-wave side out-of-band ASE noise power and a long-wave side out-of-band ASE noise power;

the pump light power information of the at least one pump source comprises a drive current of the at least one pump source; and

in the correspondence, each combination of the short-wave side out-of-band ASE noise power, the long-wave side out-of-band ASE noise power, the drive current of the at least one pump source, and the power information of the output signal corresponds to one gain of the monitoring channel.

6. The method according to claim 1, wherein the method further comprises:

adjusting the gain of the monitoring channel of the Raman optical amplifier to a target gain by controlling a pump light power of the at least one pump source of the Raman optical amplifier.

7. The method according to claim 6, wherein the controlling a pump light power of the at least one pump source of the Raman optical amplifier comprises:

determining a magnitude relationship between the present gain of the monitoring channel of the Raman optical amplifier and the target gain; and

when the present gain of the monitoring channel is greater than the target gain, reducing the pump light power of the at least one pump source; and

when the present gain of the monitoring channel is less than the target gain, increasing the pump light power of the at least one pump source.

8. An apparatus for determining a gain of a Raman optical amplifier, wherein the apparatus comprises a processor and a non-transitory computer-readable memory including computer-executable instructions executed by the processor to perform operations comprising:

receiving information, through at least one input port;

establishing a correspondence between a gain of at least one monitoring channel of the Raman optical amplifier and gain parameter information;

wherein the at least one monitoring channel comprises at least one of a transmission channel corresponding to an output-power peak value and an output-power trough value of the Raman optical amplifier;

acquiring present gain parameter information of a Raman optical amplifier, wherein the present gain parameter information comprises out-of-band amplified spontaneous emission (ASE) noise power information of ASE noise generated by the Raman optical amplifier, pump light power information of at least one pump source of the Raman optical amplifier, and power information of an output signal of the Raman optical amplifier; and

determining a present gain of a monitoring channel of the Raman optical amplifier according to the acquired present gain parameter information and the correspondence between the gain of the at least one monitoring channel of the Raman optical amplifier and the gain parameter information;

wherein the monitoring channel of the Raman optical amplifier is comprised in the at least one monitoring channel and the present gain parameter information is included in the gain parameter information.

9. The apparatus according to claim 8, wherein

the out-of-band amplified spontaneous emission (ASE) noise power information comprises at least one of a short-wave side out-of-band ASE noise power, a long-wave side out-of-band ASE noise power, and a total out-of-band ASE noise power;

and

the pump light power information of the at least one pump source comprises at least one of a drive voltage of the at least one pump source, a drive current of the at least one pump source, and a power of output pump light of the at least one pump source.

10. The apparatus according to claim 8, wherein the out-of-band amplified spontaneous emission (ASE) noise power information comprises a short-wave side out-of-band ASE noise power and a long-wave side out-of-band ASE noise power;

the pump light power information of the at least one pump source comprises a power of output pump light of the at least one pump source; and

in the correspondence, each combination of the short-wave side out-of-band ASE noise power, the long-wave side out-of-band ASE noise power, the power of the output pump light of the at least one pump source, and the power information of the output signal corresponds to one gain of the monitoring channel.

11. The apparatus according to claim 8, wherein the out-of-band amplified spontaneous emission (ASE) noise power information comprises a short-wave side out-of-band ASE noise power and a long-wave side out-of-band ASE noise power;

the pump light power information of the at least one pump source comprises a drive voltage of the at least one pump source; and

in the correspondence, each combination of the short-wave side out-of-band ASE noise power, the long-wave side out-of-band ASE noise power, the drive voltage of the at least one pump source, and the power information of the output signal corresponds to one gain of the monitoring channel.

12. The apparatus according to claim 8, wherein the out-of-band amplified spontaneous emission (ASE) noise power information comprises a short-wave side out-of-band ASE noise power and a long-wave side out-of-band ASE noise power;

the pump light power information of the at least one pump source comprises a drive current of the at least one pump source; and

in the correspondence, each combination of the short-wave side out-of-band ASE noise power, the long-wave side out-of-band ASE noise power, the drive current of the at least one pump source, and the power information of the output signal corresponds to one gain of the monitoring channel.

13. The apparatus according to claim 8, wherein the operations further comprise adjusting the gain of the monitoring channel of the Raman optical amplifier to a target gain by controlling a pump light power of the at least one pump source of the Raman optical amplifier.

14. The apparatus according to claim 13, wherein the controlling a pump light power of the at least one pump source of the Raman optical amplifier by the processing component comprises:

determining a magnitude relationship between the present gain of the monitoring channel of the Raman optical amplifier and the target gain; and

when the present gain of the monitoring channel is greater than the target gain, reducing the pump light power of the at least one pump source; and

when the present gain of the monitoring channel is less than the target gain, increasing the pump light power of the at least one pump source.

15. The apparatus according to claim 8, wherein

the operations further comprise outputting, through at least one output port, at least one of the drive voltage or and the drive current to the at least one pump source of the Raman optical amplifier;

the apparatus further comprises a receiver; and

the non-transitory computer-readable memory stores the correspondence.

16. The apparatus according to claim 8, wherein the apparatus is an apparatus for determining a gain of a backward Raman optical amplifier.