Laser light generator control circuit and laser light...

Details Laser light generator control circuit and laser light... Laser light generator control circuit and laser light...

2006-09-12

2006-09-12

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C372S029021, C372S029015, C372S038070, C372S031000, C359S199200

Reexamination Certificate

active

07106768

ABSTRACT:
The laser light generator control circuit comprises a load section, a control section, a bias current circuit section, and a modulation current circuit section. The load section generates a monitor voltage V1that corresponds to the optical current corresponding to the amount of light received by a monitor light receiving element for receiving light from the laser light generator. The control section selects a combination (Db, Dm) in accordance with the result of comparing a value corresponding to the monitor voltage V1, and a reference value, from a group of combinations (Db, Dm)nthat comprises a plurality of combinations (Db, Dm) of a value Db that corresponds to the bias current and a value Dm that corresponds to the modulation current, these combinations being specified so that the light emission power and the extinction ratio are constant, and generates a first control signal V2and a second control signal V3on the basis of the selected combination (Db, Dm).

REFERENCES:
patent: 5978393 (1999-11-01), Feldman et al.
patent: 6512617 (2003-01-01), Tanji et al.
patent: 2004/0165622 (2004-08-01), Lu
patent: 2001-197014 (2001-07-01), None

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