Surveillance method of optical communication line

Details Surveillance method of optical communication line Surveillance method of optical communication line

1997-01-08

1999-05-11

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359130, 359337, 359339, 359341, H04B10/17

Patent

active

059033754

ABSTRACT:
To enable the surveillance of a long-distance optical fiber line that a method using the reflection lights and Rayleigh backscatter lights cannot cover, a plurality of optical reflection elements P1-Pn are interposed in the optical fiber line at each specific distance. Each of the optical reflection elements P1-Pn reflects only a light signal of one of specific wavelengths .lambda.1-.lambda.n on a constant level. Light pulses of the specific wavelengths .lambda.1-.lambda.n are transmitted to the optical fiber line to measure intensities of the light pulses reflected by the optical reflection elements P1-Pn. From the measurement, surveillance of the optical fiber line can be done between the transmitter and each of positions of the optical reflection elements P1-Pn. The reflectance of the optical reflection elements P1-Pn can be set to 100%, and the surveillance becomes possible even if the length of the optical fiber line exceeds 200 km.

REFERENCES:
patent: 5187362 (1993-02-01), Keeble
patent: 5557400 (1996-09-01), Sorin et al.
patent: 5726784 (1998-03-01), Alexander et al.
patent: 5757487 (1998-05-01), Kersey
patent: 5771250 (1998-06-01), Shigehara et al.

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