Related Experiment Video
Updated: Jun 29, 2026

Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
Coherent optical frequency transfer over 50-km physical distance using a 120-km-long installed telecom fiber network
Mitsuru Musha1, Feng-Lei Hong, Ken'ichi Nakagawa
1Institute for Laser Science, University of electro-communications, Chofugaoka Chofu-shi, Tokyo, Japan. musha@ils.uec.ac.jp
Abstract:
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.
Related Concept Videos
Propagation Speed of Electromagnetic Waves
Energy Stored In A Coaxial Cable
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic field inside...
Electronic Distance Measuring Instruments
Transmission Line Design Considerations
Speed of a Transverse Wave
One of the key properties of any wave is the wave speed. Light...
Distance Measurements by Taping

