Coupled loop controller for a laser transmitter
Patent
·
OSTI ID:6288478
This patent describes an apparatus for controlling the power of a laser transmitter over a predetermined range of ambient temperatures comprising: a modulator for receiving data input as logical 1's and 0's and for converting the logical 1's and 0's into corresponding high and low levels of laser modulation current; a backface monitor for monitoring the power output from the laser and for generating a current proportional to the power output; means, responsive to the current from the backface monitor, for controlling bias current from the laser; means responsive to a reference voltage and to a voltage proportional to the laser bias current, for controlling the laser modulation current; and means for coupling the voltage proportional to the bias current from the bias current control means to the modulation current control means.
- Assignee:
- AT and T Bell Laboratories, Murray Hill, NJ
- Patent Number(s):
- US 4677632
- OSTI ID:
- 6288478
- Country of Publication:
- United States
- Language:
- English
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