Signal-off detection circuit and optical receiving device...

Details Signal-off detection circuit and optical receiving device... Signal-off detection circuit and optical receiving device...

2007-08-14

2007-08-14

Chan, Jason (Department: 2613)

Optical communications

Diagnostic testing

Fault detection

C398S017000, C398S151000, C327S018000, C327S020000, C370S242000, C375S338000

Reexamination Certificate

active

10292434

ABSTRACT:
This invention offers a signal-off detection circuit allowing arbitrary setting of an issuing time (response time) of a signal disconnection alarm without being affected by a time constant of a direct current feedback circuit giving an offset voltage to an amplifier for amplifying a data signal. Input data signals per a fixed time determined by a timer is counted by a counter, and a count value is compared with a predetermined set value in a comparator. A configuration is made such that a signal disconnection alarm may be issued by detecting a disconnection state of the data signal according to a comparison result. Thereby, an issuing time of a signal disconnection alarm can be set without being affected by a time constant of a direct current feedback circuit giving an offset voltage to an amplifier for amplifying a data signal of a preceding stage.

REFERENCES:
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patent: 2001-237681 (2001-08-01), None

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