Optical transmitter and optical transmitting apparatus using...

Details Optical transmitter and optical transmitting apparatus using... Optical transmitter and optical transmitting apparatus using...

2005-05-31

2005-05-31

Chan, Jason (Department: 2633)

Optical communications

Transmitter

C398S183000, C398S189000

Reexamination Certificate

active

06901223

ABSTRACT:
An optical transmitter for use in an optical transmitting system based on PDS (Passive Double Star) technology, does not erroneously output an optical signal when the optical transmitter is powered on/off. The optical transmitter has a current source1for outputting a drive current having a magnitude corresponding to an input control signal, a Laser diode (LD) for generating an optical output signal based on the received drive current, a modulator9for controlling the supply and cutoff of the drive current to the Laser diode (LD), a source voltage detector3for monitoring a source voltage to detect whether the source voltage is lower than a predetermined voltage, and a switch circuit4for outputting a control signal to the current source1to stop the supply of the drive current when the source voltage is determined to be lower than the predetermined voltage.

REFERENCES:
patent: 5548435 (1996-08-01), Tahara et al.
patent: 5900959 (1999-05-01), Noda et al.
patent: 6040931 (2000-03-01), Miyazaki et al.
patent: 06097889 (1994-08-01), None

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