Semiconductor laser drive

Details Semiconductor laser drive Semiconductor laser drive

1995-01-18

1996-10-08

Scott, Jr., Leon

Coherent light generators

Particular component circuitry

Optical pumping

372 29, H01S 300

Patent

active

055638988

ABSTRACT:
A reference-voltage generator controls the level of a reference voltage in dependence upon temperature, and a drive-current supply unit passes a drive current through a semiconductor laser when the voltage of an input signal is greater than (or less than) the reference voltage. Even if a threshold-value current of the semiconductor laser increases owing to a rise in ambient temperature, as a result of which there is an increase in the delay time of the optical power waveform of the laser, the reference voltage declines in conformity with the temperature rise and the time at which drive current begins to flow into the semiconductor laser is made earlier. This offsets the delay time so that a stabilized optical power waveform and optical output power are generated. In addition, a drive-current controller increases the value of drive current in conformity with a rise in temperature. As a result, the drive current which flows through the semiconductor laser increases in dependence upon the temperature rise. A stabilized optical output power is thus generated.

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Wittke et al; Stabilization of CW Injection Kasers; RCA Technical Notes; TN No.1005; Apr. 9,1975.

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