公开(公告)号：US20220342151A1

公开(公告)日：2022-10-27

申请号：US17854585

申请日：2022-06-30

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Qiang GUO ,  RUI ZHOU ,  Zhiqun YANG ,  Lin ZHANG

IPC: G02B6/14 ,  H04J14/04

Abstract: A communication system is provided. The communication system may include few mode fibers of at least two spans and a mode converter. The few mode fiber is configured to transmit M received mode groups, where group delays of the M mode groups during transmission in the few mode fiber are symmetrically distributed about a center. The mode converter is configured to: receive the M mode groups from the few mode fiber, perform mode group exchange between a first mode group and a second mode group in the M mode groups to obtain M exchanged mode groups, where a group delay of the first mode group and a group delay of the second mode group are symmetric about the center.

公开(公告)号：US20220329035A1

公开(公告)日：2022-10-13

申请号：US17851307

申请日：2022-06-28

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Lin Zhang ,  Yaping Liu ,  Zhiqun Yang ,  Qiang Guo ,  RUI ZHOU

IPC: H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  H01S3/16

Abstract: A fiber amplifier is provided, including a pump laser (202), a pump and signal combiner (203), and a few-mode doped fiber (204). The pump laser (202) is configured to output pump light. The pump and signal combiner (203) is configured to couple input few-mode signal light and the pump light into the few-mode doped fiber (204). Refractive indexes of a fiber core of the few-mode doped fiber (204) are distributed to be gradient along a radial direction of a cross section, the fiber core is etched with periodic gratings along an axial direction, and periods of the gratings satisfy a phase matching condition. The fiber amplifier achieves strong coupling and co-amplification between optical signal modes, thereby reducing a differential gain between mode groups.