METHOD AND DEVICE FOR MONITORING OPTICAL SIGNAL

Japanese Patent JP3221401

B2

PROBLEM TO BE SOLVED: To monitor an optical transmission signal in the unit of one bit in spite of transmission signal rate.
SOLUTION: An electric signal, for which the desired optical signal is converted into electric one by an optical receiver 202, is inputted to an optical signal quality monitoring device 203. The optical signal quality monitoring circuit 203 is provided with bit discriminating circuits 204 and 205 for discriminating whether the input electric signal bit is high level or low level by setting a voltage amplitude threshold value and a phase threshold value. The outputs of these bit discriminating circuits 204 and 205 are exclusively ORed by an exclusive output OR circuit 206 and the number of errors within the predetermined time is integrated by an error number integrating circuit 207. When the number of errors exceeds a predetermined threshold value, the error number integrating circuit 207 can report quality degradation fault information to the outside.

Hitoshi Takeshita
Hiroshi Shimomura
Tatsuya Shirakaki
Naoya Hemmi

JP16715298A

October 22, 2001

June 15, 1998

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NEC

H03K5/00; H03K5/15; H04B1/74; H04B10/032; H04B10/07; H04B10/079; H04B10/2507; H04B10/40; H04B10/50; H04B10/54; H04B10/58; H04B10/60; H04B10/69; H04L1/20; H04L25/02; H04L25/06; H04L25/08; H04Q11/00; (IPC1-7): H04L25/02; H04B10/04; H04B10/06; H04B10/08; H04B10/14; H04B10/26; H04B10/28

JP8265375A
JP53105905A
JP4315333A
JP417432A
JP1154660A

Yasuo Suzuki (1 person outside)

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