Gain Adjuster, Gain Adjustment Method, and Optical Line Terminal

Patent metadata

Field	Value
Publication number	US-2022344891-A1
Application number	US-202217836775-A
Country	US
Kind code	A1
Filing date	Jun 9, 2022
Priority date	Dec 13, 2019
Publication date	Oct 27, 2022
Grant date	—

Abstract

A gain adjuster, a gain adjustment method, and an optical line terminal are provided, to separately adjust a gain of a to-be-adjusted optical signal. The gain adjuster includes a light spot conversion component and a gain medium that are sequentially coupled. The gain adjuster further includes a pump laser. The light spot conversion component is configured to adjust light spot sizes of at least some optical signals in received optical signals to output a first optical signal transmitted in space. The pump laser is configured to excite the gain medium. The gain medium is configured to adjust a gain of the first optical signal to output a second optical signal.

First claim

1 - 20 . (canceled)

21 . A gain adjuster, comprising:
a light spot conversion component and a gain medium that are sequentially coupled; and a pump laser; wherein, the light spot conversion component is configured to adjust light spot sizes of at least some optical signals in received optical signals to output a first optical signal transmitted in space; the pump laser is configured to excite the gain medium; and the gain medium is configured to adjust, when exited by the pump laser, a gain of the first optical signal to output a second optical signal.

22 . The gain adjuster according to claim 21 , wherein the pump laser is coupled to the gain medium, and the pump laser is located in a region opposite to a side face of the gain medium; and wherein the pump laser is configured to output a pump light to perform side-face excitation on the gain medium using the pump light.

23 . The gain adjuster according to claim 22 , wherein the gain adjuster further comprises a light spot shaping component coupled between the gain medium and the pump laser; and
the light spot shaping component is configured to shape the pump light to form a shaped pump light, the shaped pump light being used to excite the gain medium, and wherein the shaped pump light forms a pump light radiation region, and the gain medium is located in the pump light radiation region.

24 . The gain adjuster according to claim 21 , wherein the pump laser is coupled to the gain medium, and the pump laser is located in a region opposite to an end face of the gain medium; and wherein the pump laser is configured to output a pump light to perform end-face excitation on the gain medium using the pump light.

25 . The gain adjuster according to claim 21 , wherein a light spot size of the first optical signal is positively correlated with a gain magnitude of the second optical signal.

26 . The gain adjuster according to claim 21 , wherein the gain adjuster further comprises a first beam conversion component and a second beam conversion component, the first beam conversion component, the light spot conversion component, the gain medium, and the second beam conversion component being sequentially coupled;
the first beam conversion component is configured to divide a wavelength division multiplexing signal to output a plurality of channels of to-be-adjusted optical signals; the light spot conversion component is further configured to separately adjust light spot sizes of the plurality of channels of to-be-adjusted optical signals to output a plurality of channels of first optical signals, wherein the at least some optical signals comprise the plurality of channels of to-be-adjusted optical signals; the gain medium is further configured to separately adjust gains of the plurality of channels of first optical signals to output a plurality of channels of second optical signals; and the second beam conversion component is configured to multiplex the plurality of channels of second optical signals.

27 . The gain adjuster according to claim 26 , wherein each of the plurality of channels of to-be-adjusted optical signals corresponds to a gain value in a gain curve, and
the light spot conversion component is further configured to adjust a light spot size of each of the plurality of channels of to-be-adjusted optical signals to obtain a target light spot size, wherein the target light spot size is a light spot size of a to-be-adjusted optical signal corresponding to a maximum value in a plurality of gain values, and the gain medium is configured to perform gain adjustment based on the gain curve.

28 . The gain adjuster according to claim 21 , wherein the light spot conversion component is configured to adjust the light spot sizes of the at least some optical signals based on a preset focal length, the preset focal length corresponding to wavelengths of the at least some optical signals.

29 . The gain adjuster according to claim 21 , wherein the gain adjuster further comprises a multiplexer, and the multiplexer is separately coupled to the pump laser and the light spot conversion component;
the multiplexer is configured to receive a to-be-adjusted optical signal and a pump light output by the pump laser; the multiplexer is configured to multiplex the to-be-adjusted optical signal and the pump light to output a multiplexed optical signal, wherein an optical axis of the to-be-adjusted optical signal comprised in the multiplexed optical signal overlaps an optical axis of the pump light comprised in the multiplexed optical signal; and the light spot conversion component is configured to adjust a light spot size of the multiplexed optical signal to output the first optical signal, wherein the at least some optical signals comprise at least the pump light.

30 . The gain adjuster according to claim 29 , wherein a light spot size of the pump light is negatively correlated with a gain magnitude of the second optical signal.

31 . A method applied to a gain adjuster, comprising:
adjusting, by a light spot conversion component of the gain adjuster, light spot sizes of at least some optical signals in received optical signals to output a first optical signal transmitted in space; exciting, by a pump laser of the gain adjuster, a gain medium of the gain adjuster; and adjusting, by the gain medium when excited by the pump laser, a gain of the first optical signal to output a second optical signal.

32 . The method according to claim 31 , further comprising:
shaping, by a light spot shaping component coupled between the gain medium and the pump laser, a pump light to form a shaped pump light, the pump light being generated by the pump laser, and the shaped pump light being used to excite the gain medium, wherein the shaped pump light forms a pump light radiation region, and the gain medium is located in the pump light radiation region.

33 . The method according to claim 31 , wherein a light spot size of the first optical signal is positively correlated with a gain magnitude of the second optical signal.

34 . The method according to claim 31 , further comprising:
obtaining, by a multiplexer of the gain adjuster, a to-be-adjusted optical signal and a pump light output by the pump laser; and multiplexing, by the multiplexer, the to-be-adjusted optical signal and the pump light to output a multiplexed optical signal, wherein an optical axis of the to-be-adjusted optical signal comprised in the multiplexed optical signal overlaps an optical axis of the pump light comprised in the multiplexed optical signal; and wherein adjusting, by the light spot conversion component, the light spot sizes of the at least some optical signals in the received optical signals comprises:
adjusting, by the light spot conversion component, a light spot size of the multiplexed optical signal to output the first optical signal, wherein the at least some optical signals comprise at least the pump light.

35 . The method according to claim 34 , wherein a light spot size of the pump light is negatively correlated with a gain magnitude of the second optical signal.

36 . An optical line terminal comprising:
a gain adjuster connected to a passive optical splitter through a feeder fiber, the gain adjuster being configured to adjust a gain of a received optical signal, and the gain adjuster comprising: a light spot conversion component and a gain medium that are sequentially coupled; and a pump laser; and wherein the light spot conversion component is configured to adjust light spot sizes of at least some optical signals in received optical signals to out

Assignees

• Huawei Tech Co Ltd

Inventors

• Yu Yongze
• Jiang Hengyun
• Yan Yunfei

Classifications

• H04B10/294 Primary

  in a multiwavelength system, e.g. gain equalisation · CPC title

• H01S3/1022 Primary

  by controlling the optical pumping · CPC title

• H01S3/094 Primary

  by coherent light · CPC title

• H04J14/0202

  Arrangements therefor · CPC title

• H01S3/10007

  in optical amplifiers · CPC title