Automatic setting of laser diode bias current

Details Automatic setting of laser diode bias current Automatic setting of laser diode bias current

2008-07-15

2008-07-15

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

Having feedback circuitry

C372S029011

Reexamination Certificate

active

07400661

ABSTRACT:
Threshold current may be determined and one or more bias sources may be programmed in a laser drive circuit. For example, a laser diode emits light along first and second optical paths. A polarizer is positioned in the first optical path between the laser diode and a first detector, which outputs a first detector signal corresponding to the measured optical power of polarized light. A second detector monitors light along the second optical path and provides a second detector signal. A bias compensation circuit receives the first and second detector signals and provides a bias current control signal, which is utilized to program a bias current source supplied to the laser diode. Additionally, multiple polarizer devices may be utilized e.g., a first polarizer in a first optical path aligned with the laser beam and a second polarizer in a second optical path aligned substantially orthogonal to the polarization of the laser beam.

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patent: 2007/0053395 (2007-03-01), Kamatani et al.

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