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Patent Searching and Data


Title:
OPTICAL SIGNAL RECEIVER
Document Type and Number:
Japanese Patent JP2002232363
Kind Code:
A
Abstract:

To remove an incorrect pulse when a reset pulse is inputted and when '0' level is continuously inputted and to accurately output a digital signal having a proper pulse width regarding burst input of an optical signal.

A peak detector 4 detects a peak value equivalent to '1' level of a voltage signal S2, and a zero level detector 5 detects a peak value equivalent to '0' level. A threshold arithmetic circuit 6 outputs an intermediate value of the peak values as threshold values to a limiter 3, and the limiter 3 determines a digital value depending upon whether a voltage signal S3 exceeds the intermediate value or not. A level detection circuit 7 compares a predetermined voltage Vth1 and the output of the signal S3 from the peak detector 4. When the signal S3 exceeds the predetermined voltage Vth1, a gate circuit 8 is 'opened' and a signal S6 determined by the limiter 3 is caused to pass and is outputted. When the signal S3 does not exceed the predetermined voltage Vth1, the gate circuit 8 is 'closed' and a signal S6 determined by the limiter 3 is cut off.


Inventors:
NOGAMI MASAMICHI
MOTOJIMA KUNIAKI
Application Number:
JP2001022131A
Publication Date:
August 16, 2002
Filing Date:
January 30, 2001
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H04B10/40; H04B10/07; H04B10/2507; H04B10/50; H04B10/60; H04B10/66; (IPC1-7): H04B10/28; H04B10/04; H04B10/06; H04B10/14; H04B10/26
Attorney, Agent or Firm:
酒井 宏明