US 12,424,811 B2
Optical amplification apparatus, and mode division multiplexing system including optical amplification apparatus
Qiang Guo, Shenzhen (CN); Rui Zhou, Shenzhen (CN); Zhiqun Yang, Tianjin (CN); Tao Xu, Tianjin (CN); Yaping Liu, Tianjin (CN); and Lin Zhang, Tianjin (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Jun. 9, 2023, as Appl. No. 18/332,130.
Application 18/332,130 is a continuation of application No. PCT/CN2021/137097, filed on Dec. 10, 2021.
Claims priority of application No. 202011442785.X (CN), filed on Dec. 11, 2020.
Prior Publication US 2023/0318733 A1, Oct. 5, 2023
Int. Cl. H04B 10/293 (2013.01); G02B 6/14 (2006.01); H01S 3/067 (2006.01); H01S 3/094 (2006.01); H01S 3/10 (2006.01); H01S 3/16 (2006.01); H04B 10/2581 (2013.01); H04J 14/04 (2006.01)
CPC H01S 3/094011 (2013.01) [G02B 6/14 (2013.01); H01S 3/06758 (2013.01); H01S 3/10007 (2013.01); H01S 3/10023 (2013.01); H01S 3/1608 (2013.01); H04B 10/2581 (2013.01); H04B 10/293 (2013.01); H04B 10/2931 (2013.01); H04B 10/2935 (2013.01); H04B 10/2939 (2013.01); H04J 14/04 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical amplification apparatus comprising:
a first optical amplifier;
a second optical amplifier; and
a mode exchanger;
wherein the first optical amplifier is connected to an input port of the mode exchanger, and the second optical amplifier is connected to an output port of the mode exchanger;
the first optical amplifier is configured to amplify optical signals carried in a plurality of transmission modes, C1, C2, . . . , CM, of a few-mode fiber, and gain values corresponding to the plurality of transmission modes of the few-mode fiber are respectively G1(C1)>G2(C2)> . . . >GM(CM), the plurality of transmission modes of the few-mode fiber are grouped into N groups, each group comprises two transmission modes: (Ci, C(M+1−i)), and N is a positive integer greater than 1;
the mode exchanger is configured to exchange the two transmission modes carrying the optical signals in each group, and an exchange policy of the mode exchanger is to centrosymmetrically exchange a mode Ci in gain Gi and a mode C(M+1−i) in gain G(M+1−i); and
the second optical amplifier is configured to amplify the optical signals that are carried in the two transmission modes in each group and whose modes are exchanged.