Controlling modulation and bias of laser drivers

Coherent light generators – Particular component circuitry – For driving or controlling laser

Reexamination Certificate

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Details

C372S038100, C372S038010, C372S038040, C372S038070

Reexamination Certificate

active

06859473

ABSTRACT:
A method for controlling a modulation current and a bias current of a laser driver includes generating a differential signal that has a voltage offset, for setting the modulation current, over a pair of differential inputs from a pre-driver circuit to a laser driver circuit. A voltage is generated for setting the bias current over a bias/monitor pin from the pre-driver circuit to the laser driver circuit. The voltage offset is sensed at the laser driver circuit and the modulation current is set based on the voltage offset. The voltage is sensed at the laser driver circuit and the bias current is set based on the voltage. A photo current is delivered over the bias/monitor pin from the laser driver circuit to the pre-driver circuit wherein no interaction occurs between the photo current and the voltage. The voltage is then modified based on the photo current.

REFERENCES:
patent: 6014235 (2000-01-01), Norte
patent: 6560258 (2003-05-01), McQuilkin
patent: 6618406 (2003-09-01), Kaminishi
patent: 20030002551 (2003-01-01), Kwon et al.
patent: 20030086455 (2003-05-01), Ciubotaru et al.

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