The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 2026
Filed:
Jun. 28, 2022
Huawei Technologies Co., Ltd., Shenzhen, CN;
Lin Zhang, Tianjin, CN;
Yaping Liu, Tianjin, CN;
Zhiqun Yang, Tianjin, CN;
Qiang Guo, Shenzhen, CN;
Rui Zhou, Shenzhen, CN;
HUAWEI TECHNOLOGIES CO., LTD., Shenzhen, CN;
Abstract
A fiber amplifier is provided, including a pump laser (), a pump and signal combiner (), and a few-mode doped fiber (). The pump laser () is configured to output pump light. The pump and signal combiner () is configured to couple input few-mode signal light and the pump light into the few-mode doped fiber (). Refractive indexes of a fiber core of the few-mode doped fiber () 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.