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1. (WO1997008856) OPTICAL FIBER TRANSMISSION SYSTEM

Pub. No.:    WO/1997/008856    International Application No.:    PCT/JP1996/002340
Publication Date: Mar 6, 1997 International Filing Date: Aug 22, 1996
IPC: H04B 10/077
H04B 10/079
H04B 10/25
H04B 10/2507
H04B 10/2575
H04B 10/54
H04B 10/572
Applicants: NTT MOBILE COMMUNICATIONS NETWORK INC.

TARUSAWA, Yoshiaki

NOJIMA, Toshio

ITO, Yasushi

Inventors: TARUSAWA, Yoshiaki

NOJIMA, Toshio

ITO, Yasushi

Title: OPTICAL FIBER TRANSMISSION SYSTEM
Abstract:
An optical fiber transmission system wherein a plurality of access units are cascade-connected through UP and DOWN optical fiber cables and are connected to a base unit which has a beat noise detection circuit and a noise information generation circuit. When beat noise is detected, noise information is transmitted to the access units through the optical fiber cables. Each access unit includes a random signal generation circuit for generating a random value in response to the noise information and a wavelength control circuit for selecting at random the oscillation wavelength of a laser diode in accordance with the random value. Each access unit repeats random wavelength selection until the noise information is not generated.