Control circuit for the drive current of a laser

Coherent light generators – Particular beam control device – Having particular beam control circuit component

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H01S 313

Patent

active

043476104

ABSTRACT:
Control circuit for controlling a laser drive current. In known control circuits certain levels of the optical output signal are kept constant. This renders it difficult to satisfy certain requirements during the life of the laser as regards the linearity of the modulation of the optical output signal. In the described control circuit the intermodulation of two signals present in the modulation signal with substantially constant amplitudes is measured, an error signal which controls a component of the drive current being derived therefrom.

REFERENCES:
patent: 3898583 (1975-08-01), Shuey
patent: 4166985 (1979-09-01), White et al.
patent: 4237427 (1980-12-01), Holland

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