公开(公告)号：US11747565B2

公开(公告)日：2023-09-05

申请号：US17863100

申请日：2022-07-12

申请人： Huawei Technologies Co., Ltd.

发明人： Juhao Li ,  Jinglong Zhu ,  Yongqi He ,  Shengling Wu ,  Qiang Guo ,  Ruishan Chen ,  Rui Zhou

IPC分类号： G02B6/293 ,  G02B6/02

CPC分类号： G02B6/29319 ,  G02B6/02123 ,  G02B6/02295

摘要： An optical fiber filter includes a fiber core, inner cladding, and outer cladding. A refractive index of the fiber core, a refractive index of the inner cladding, and a refractive index of the outer cladding progressively decrease in sequence. The fiber core is configured to transmit at least two mutually different first optical signal modes, the inner cladding is configured to transmit at least two mutually different second optical signal modes, and at least one fiber grating is etched on the fiber core. At least part of optical power of a target first optical signal mode is coupled to only a target second optical signal mode at the fiber grating. The target first optical signal mode is one of the at least two first optical signal modes, and the target second optical signal mode is one of the at least two second optical signal modes.