Peak optical power control circuit for laser driver

Details Peak optical power control circuit for laser driver Peak optical power control circuit for laser driver

1985-02-28

1987-10-06

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Optical output stabilization

372 38, 372 33, H01S 313

Patent

active

046988173

ABSTRACT:
To compensate for variations in a laser's peak power output due to changes in slope efficiency, a feedback loop is provided to monitor light output and effect compensatory changes in the drive current. In the feedback loop, the light output is detected by a photodiode. The output of the photodiode is filtered by a bandpass filter. The mean power of the filtered signal is determined and compared with a reference to control the laser drive. The reference takes account of the relationship between the filtered signal power and the peak power in the frequency spectrum of the pseudo-random input signal. The use of this reduced-bandwidth signal allows a relatively cheap, low bandwidth photodiode to be used with a long-wavelength laser.

REFERENCES:
patent: 3898583 (1975-08-01), Shuey
patent: 4009385 (1977-02-01), Sell
patent: 4243951 (1981-01-01), Wolkstein et al.
patent: 4344173 (1982-10-01), Straus
patent: 4355395 (1982-10-01), Satter et al.

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