METHOD AND APPARATUS FOR DETERMINING GAIN OF RAMAN OPTICAL AMPLIFIER AND RAMAN OPTICAL AMPLIFIER

• US 20160329678A1
• Filed: 07/21/2016
• Published: 11/10/2016
• 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
• Granted Patent: US 9,768,582 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 present invention discloses 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:

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 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 a correspondence between a gain of the monitoring channel of the Raman optical amplifier and 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, or 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, or 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;

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

before determining the present gain of the monitoring channel of the Raman optical amplifier, establishing a correspondence between a gain of at least one monitoring channel comprising the monitoring channel and gain parameter information.

9. The method according to claim 8, wherein the at least one monitoring channel comprises a transmission channel corresponding to an output-power peak value and/or output-power trough value of the Raman optical amplifier.

10. An apparatus for determining a gain of a Raman optical amplifier, wherein the apparatus comprises:

a receiving component configured to receive information, wherein the receiving component has at least one input port; and

a processing component connected to the receiving component, wherein the processing component is configured to;

acquire 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 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

determine a present gain of a monitoring channel of the Raman optical amplifier according to the acquired present gain parameter information and a correspondence between a gain of the monitoring channel of the Raman optical amplifier and gain parameter information.

11. The apparatus according to claim 10, 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, or 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, or a power of output pump light of the at least one pump source.

12. The apparatus according to claim 10, 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.

13. The apparatus according to claim 10, 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.

14. The apparatus according to claim 10, 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.

15. The apparatus according to claim 10, wherein the processing component is further configured to adjust 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.

16. The apparatus according to claim 15, wherein the controlling a pump light power of the at least one pump source of the Raman optical amplifier by the processing component specifically comprises:

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

when determining that 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;

or when determining that 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.

17. The apparatus according to claim 10, wherein the processing component is further configured to:

before determining the present gain of the monitoring channel of the Raman optical amplifier, establish a correspondence between a gain of at least one monitoring channel comprising the monitoring channel and gain parameter information.

18. The apparatus according to claim 17, wherein the at least one monitoring channel comprises a transmission channel corresponding to an output-power peak value and/or output-power trough value of the Raman optical amplifier.

19. The apparatus according to claim 10, wherein the receiving component is a receiver, the apparatus further comprises:

at least one output port, configured to output the drive voltage or the drive current to the at least one pump source of the Raman optical amplifier; and

the processing component comprises a memory and a processor, wherein the memory is configured to store an instruction and the correspondence, and the processor is configured to execute the instruction stored in the memory.

20. The apparatus according to claim 10, wherein the apparatus is an apparatus for determining a gain of a backward Raman optical amplifier.