Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2008-07-15
2008-07-15
Hjerpe, Richard (Department: 2629)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S157000
Reexamination Certificate
active
10806330
ABSTRACT:
The present invention has an object to provide a technology for monitoring the quality of a WDM signal light, capable of quickly and accurately judging an occurrence of quality deterioration of signal light and a deterioration factor thereof. To this end, according to a quality monitoring apparatus of WDM signal light of the present invention, a part of the WDM signal light being propagated through an optical transmission path is branched as a monitor light, a signal light of one wavelength contained in the monitor light is selected as a channel to be measured. Then, the frequency of occurrences of bit error for the channel to be measured is repeatedly measured for a plurality of times, and whether or not the signal quality is deteriorated is judged, together with the deterioration factor based on the measurement results, and a control signal light for adjusting the signal light power according to the judgment result is transmitted to the optical transmission path, to achieve the improvement of a characteristic of the WDM signal light.
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Katagiri Toru
Naito Takao
Nakamoto Hiroshi
Torii Ken-ichi
Abdin Shaheda A
Fujitsu Limited
Hjerpe Richard
Staas & Halsey , LLP
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