Title:
MONITOR METHOD FOR OPTICAL COMMUNICATION LINE
Document Type and Number:
Japanese Patent JP3411436
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To monitor an optical fiber line with a distance which cannot be monitored by an OTDR(optical time domain reflection).
SOLUTION: Plural optical reflection elements P1-Pn are inserted to an optical fiber line 1 at a prescribed distance each. The optical reflection elements P1-Pn reflect only a signal of a specific wavelength by a prescribed quantity and the specific wavelength differs as wavelengths λ1-λn. The optical fiber line 1 up to the position of the optical reflection elements P1-Pn is monitored by sending the optical pulses of the wavelengths λ1-λn to the optical fiber line 1 and measuring the reflected light strength reflected in the optical reflection elements P1-Pn. Since the reflectance of the optical reflection elements P1-Pn is selected to be 100%, the line in excess of 200km is monitored.
Inventors:
Yukio Horiuchi
Shu Yamamoto
Shu Yamamoto
Application Number:
JP2190296A
Publication Date:
June 03, 2003
Filing Date:
January 12, 1996
Export Citation:
Assignee:
KDDI CORPORATION
International Classes:
G01M11/00; G02F1/35; H04B10/035; H04B10/07; H04B10/071; H04B10/077; (IPC1-7): H04B10/08; G01M11/00; G02F1/35
Domestic Patent References:
| JP53119068A | ||||
| JP4211204A | ||||
| JP6232817A | ||||
| JP60121829A |
Attorney, Agent or Firm:
Atsuo Waki (1 person outside)
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