Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-02-07
1996-01-02
Boudreau, Leo
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359179, 359110, 359177, 359333, 385 15, H04B 1002, H04B 300
Patent
active
054813905
ABSTRACT:
Signal light from a terminal equipment is inputted from an input side of an ascending line, amplified by an ascending optical amplifier and sent to an output side of the ascending line by way of a first optical coupler and a second optical coupler. In the first optical coupler, part of the signal light is branched and introduced to an output side of a descending line by way of an optical transmission line and a third optical coupler. The signal light thus branched is measured and analyzed by the terminal equipment to effect detection of presence or absence of occurrence of a trouble and specification of a trouble location. This also applies to the descent. Since optical transmission paths in the optical amplifier repeater do not construct any loop, the signal to noise ratio (SNR) deteriorated by circulation noise is improved, and detection of a trouble and specification of a trouble location can be achieved with a higher degree of accuracy.
REFERENCES:
patent: 5296957 (1994-03-01), Takahashi et al.
patent: 5315674 (1994-05-01), Asako
Boudreau Leo
Fujitsu Limited
Mehta Bhavesh
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