Nippon Telegraph and Telephone Corporation

Ryota Imada

Kazuhide Nakajima

Takashi Matsui

Taiji Sakamoto

Shinichi Aozasa

Yuto Sagae

Nobutomo Hanzawa

Yoko Yamashita

Noriyuki Araki

Provided are an LPFG and an optical transmission system in which a mode conversion amount does not depend on a polarization state and an electric field distribution. The LPFG according to the present invention includes cavity rows (-and-) of cavitiesperiodically arranged in a core regionof the few-mode fiberat a position away from a central axis z of the core regionin parallel with the central axis z. Each of the cavity rows (-and-) is located at a different position in a longitudinal direction of the few-mode fiber(where the position in a z direction is different), and the cavity rows (-and-) are located at positions shifted by 90° on a cross section of the core regionwith the center of the cross section of the core region(the intersection of an x-axis and a y-axis) as an origin.

Long period fiber grating and optical transmission system

Growing community of inventors

Musashino, Japan

Ryota Imada