Automatic power restoring method and optical communication...

Optical communications – Diagnostic testing – Fault location

Reexamination Certificate

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C398S006000, C398S157000

Reexamination Certificate

active

07664392

ABSTRACT:
The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission path and an optical communication system using the method. To this end, in an optical communication system to which the automatic power restoring method of the invention is applied, a pilot signal having a low transmission rate, a wavelength of which is set based on loss wavelength characteristics obtained by combining loss wavelength characteristics of an optical fiber used for the optical transmission path and loss wavelength characteristics of the optical amplification medium on the optical transmission path, is transmitted and received between an optical transmitting station and an optical receiving station when a line fault occurs, and a detection of continuity is thus performed. According to the result of the continuity detection, the power state at the occurrence of line fault is automatically restored to the power state at a time of normal operation.

REFERENCES:
patent: 4994675 (1991-02-01), Levin et al.
patent: 5335104 (1994-08-01), Johnson
patent: 5432874 (1995-07-01), Muraguchi
patent: 5798855 (1998-08-01), Alexander et al.
patent: 6359708 (2002-03-01), Goel et al.
patent: 6483616 (2002-11-01), Maddocks et al.
patent: 2002/0097482 (2002-07-01), Sasaoka et al.
patent: 2002/0114060 (2002-08-01), Kobayashi et al.
patent: 2004/0208519 (2004-10-01), Feldman et al.
patent: 1 006 682 (2000-12-01), None
patent: 1 227 606 (2002-07-01), None
patent: 0 880 242 (2003-09-01), None
patent: 2 348 063 (2000-09-01), None
patent: 2 372 655 (2002-08-01), None
patent: 07-30494 (1995-01-01), None
patent: 07-30495 (1995-01-01), None
patent: 2001-223646 (2001-08-01), None
patent: 2001-249369 (2001-09-01), None
patent: 2001-251006 (2001-09-01), None
patent: 2002-057624 (2002-02-01), None
patent: WO 99/45662 (1999-09-01), None
patent: WO 02/058287 (2002-07-01), None
U.S. Office Action mailed Sep. 30, 2009 in related U.S. Appl. No. 12/081,781.
U.S. Appl. No. 10/793,665, filed Mar. 5, 2004, Hiroyuki Deguchi, et al., Fujitsu Limited and Nippon Telegraph and Telephone Corp.
[Unassigned] Divisional 2 1344.1136D2, Apr. 21, 2008, Hiroyuki Deguchi, et al., Fujitsu Limited and Nippon Telegraph and Telephone Corp.
UK Search Report dated, Jan. 14, 2005 for corresponding UK Application No. GB0405068.8.

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