US 12,266,899 B2
Fiber, optical amplifier, and optical communications system
Bo Wu, Chengdu (CN); and Kai Zhang, Chengdu (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Oct. 7, 2022, as Appl. No. 17/962,068.
Application 17/962,068 is a continuation of application No. PCT/CN2021/083637, filed on Mar. 29, 2021.
Claims priority of application No. 202010277671.8 (CN), filed on Apr. 8, 2020.
Prior Publication US 2023/0022687 A1, Jan. 26, 2023
Int. Cl. H01S 3/067 (2006.01); H01S 3/094 (2006.01); H04B 10/25 (2013.01)
CPC H01S 3/0675 (2013.01) [H01S 3/06716 (2013.01); H01S 3/094003 (2013.01); H04B 10/25 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A fiber comprising:
a rare earth-doped core configured to separately amplify optical signals of all wavelengths in a received multiplexing wave;
a cladding having a first refractive index that is less than a second refractive index of the rare earth-doped core, wherein the cladding and the rare earth-doped core are sequentially distributed from inside to outside of the fiber;
a gain equalizer disposed on the rare earth-doped core and configured to equalize gains of the optical signals of all the wavelengths to generate equalized gains, wherein the equalized gains all fall within a preset range, wherein a start location of the gain equalizer is based on an absorption coefficient and a preset total absorption amount that correspond to a maximum absorption peak in an absorption spectrum of the rare earth-doped core, and wherein gain of each of the optical signals is based on a ratio of power of an amplified optical signal to a power of an unamplified optical signal; and
an egress port configured to transmit the optical signals.