Open AccessCoherent optical frequency transfer over 50-km physical distance using a 120-km-long installed telecom fiber network
Author(s) -
Mitsuru Musha,
Feng−Lei Hong,
K. Nakagawa,
Ken–ichi Ueda
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.016459
Subject(s) - optics , optical fiber , phase noise , fiber , noise (video) , telecommunications , optical fiber cable , physics , materials science , computer science , image (mathematics) , artificial intelligence , composite material
Optical frequency at 1542 nm was coherently transferred over a 120-km-long installed telecom fiber network between two cities (Tsukuba and Tokyo) in Japan separated by more than 50 km. The phase noise induced by the fiber length fluctuations was actively reduced by using a fiber stretcher and an acousto-optic modulator. The fractional frequency instability of the one-way transmitted light was reduced down to less than 8.0 x 10(-16) at an averaging time of 1s, which is limited by the theoretical limit deduced from the length and the intrinsic noise of the fiber.