Data-insensitive laser diode power control

Details Data-insensitive laser diode power control Data-insensitive laser diode power control

1994-05-02

1995-05-02

Scott, Jr., Leon

Coherent light generators

Particular component circuitry

Optical pumping

372 29, H01S 300

Patent

active

054126770

ABSTRACT:
A laser diode is disclosed which utilizes a feedback system which substantially reduces the dependency of the optical output power of the laser diode on laser junction temperature which is dependent on the pixel pattern. The feedback system of this invention generates a feedback signal through comparison of an averaged train of pixel information against an averaged optical output power from the back photodiode of the laser diode. By comparing the two averaged signals, one can determine the fluctuations of the heat in the laser diode. At any given point, any discrepancy between the two averaged signals shows a temperature change in the laser diode. Depending on the amount of the difference between the two signals, the degree of excess temperature can be determined and the difference will be used for feedback correction.

REFERENCES:
patent: 4528525 (1985-07-01), Eden et al.

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