公开(公告)号：US20220239375A1

公开(公告)日：2022-07-28

申请号：US17596339

申请日：2019-06-11

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Masamichi FUJIWARA ,  Ryo lGARASHI ,  Takuya KANAI

IPC: H04B10/291

Abstract: An optical communication system includes a first optical communication device and a second optical communication device that transmit and receive an optical signal via an optical transmission line. The optical transmission line includes: a first section optical transmission line connected to the first optical communication device; and a second section optical transmission line connected to the second optical communication device and having fewer reflection points of the optical signal than the first section optical transmission line. The optical communication system includes: a light source; an incident portion that causes excitation light output from the light source to be incident to the second section optical transmission line and performs distributed Raman amplification on the optical signal; and a separating portion that separates the excitation light that is caused to be incident by the incident portion and transmitted through the second section optical transmission line in a direction of the first section optical transmission line.