Semiconductor laser driver circuit
Patent
·
OSTI ID:5525346
This patent describes a driver circuit for a laser diode. The laser diode has first and second terminals. The first terminal of the laser diode is coupled to a reference voltage. The laser diode has a threshold current level such that current flow through the laser diode exceeding the threshold current level causes lasing action of the laser diode. The driver circuit comprises: a current switching device having input, output and control terminals, the switching device being coupled at the input terminal to the second terminal of the laser diode, the current switching device being responsive to a first voltage level at the control terminal for enabling a first level of current from the input terminal to the output terminal and responsive to a second voltage level at the control terminal for disabling current flow through the switching device; and means for supplying a constant current to the input terminal, for supplying a level of the constant current which is greater than the threshold current level and less than the sum of the threshold current level and the first current level.
- Assignee:
- RCA Corp., Princeton, NJ
- Patent Number(s):
- US 4709370
- OSTI ID:
- 5525346
- Country of Publication:
- United States
- Language:
- English
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