Anti clipping circuit for laser transmitters

Details Anti clipping circuit for laser transmitters Anti clipping circuit for laser transmitters

2011-01-18

2011-01-18

Pascal, Leslie (Department: 2613)

Optical communications

Transmitter

Including compensation

C398S182000

Reexamination Certificate

active

07873285

ABSTRACT:
This anti clipping circuit is for a laser transmitter used to transmit sub-carrier multiplexed signals for CATV applications. The circuit design is based on actual clipping measurements showing the specific time and duration of the clipping events is random. The individual clipping pulses interval is fixed, every 4 us. A PHEMT peak detection circuit is used in conjunction with a missing pulse detector/timer to catch all the clipping events. Thus the laser bias current is adjusted automatically at the specific time of the clipping event and for the duration of all the clipping pulses in the event. The controlled increase and decrease of the lasers bias current is DC coupled back into the normal DC bias path via a diode. This gives the anti clipping circuit noise isolation when there are no clipping events and avoids laser clipping during the laser current recovery time as when using an AC coupling scheme.

REFERENCES:
patent: 6549316 (2003-04-01), Blauvelt
patent: 2002/0063930 (2002-05-01), Blauvelt
patent: 2004/0056720 (2004-03-01), Jansen et al.

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