公开(公告)号：US20160216440A1

公开(公告)日：2016-07-28

申请号：US15088405

申请日：2016-04-01

Applicant: Furukawa Electric Co., Ltd.

Inventor： Katsunori IMAMURA ,  Ryuichi SUGIZAKI ,  Takehiro TSURITANI ,  Koji IGARASHI

IPC: G02B6/028

CPC classification number: G02B6/0288 ,  G02B6/0281

Abstract: An optical fiber includes a core portion, and a cladding portion being formed at an outer periphery of the core portion and having a refractive index lower than a maximum refractive index of the core portion. The core portion has α-shaped refractive index profile in which a value of α is equal to or greater than 3 and equal to or smaller than 10, and at least a diameter of the core portion and a relative refractive-index difference of the core portion relative to the cladding portion are set so that light can be propagated with equal to or greater than 6 propagation modes at a wavelength of light inputted.

Abstract translation: 光纤包括芯部，以及在芯部的外周形成折射率低于芯部的最大折射率的包层部。 芯部具有α值折射率分布，其中α值等于或大于3且等于或小于10，并且芯部的至少直径和芯的相对折射率差异 设置相对于包层部分的部分，使得光可以在输入的光的波长下以等于或大于6种传播模式传播。

公开(公告)号：US20230038133A1

公开(公告)日：2023-02-09

申请号：US17955982

申请日：2022-09-29

Applicant: FURUKAWA ELECTRIC CO., LTD. ,  KDDI CORPORATION

Inventor： Shigehiro TAKASAKA ,  Koichi MAEDA ,  Ryuichi SUGIZAKI ,  Takehiro TSURITANI ,  Hidenori TAKAHASHI ,  Itsuro MORITA

IPC: H01S3/23 ,  H01S3/091 ,  H01S3/067 ,  H01S3/16

Abstract: An optical fiber amplification. system includes: a first optical fiber amplifier including a first optical amplifying fiber including a core portion doped with a first rare-earth. element, a first input unit configured to receive first signal light, an excitation-light source configured to output pump light, a pump light combiner configured to input the pump light to the first optical amplifying fiber, and a residual pump light recovery device configured to recover residual pump light; and a second optical fiber amplifier including a second optical amplifying fiber including a core portion doped with a second rare-earth. element, a second input unit configured to receive second signal light, and a residual pump light combiner configured to input, to the second optical amplifying fiber, the residual pump light recovered by the residual pump light recovery device.