Light-emitting element driver

Details Light-emitting element driver Light-emitting element driver

2006-11-01

2009-02-17

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C372S038010, C372S038070, C372S029011

Reexamination Certificate

active

07492799

ABSTRACT:
The bias current of a current injection-type light-emitting element is set very close to the threshold current, and to guarantee a stable optical output and high-speed initiation of the light-emitting operation. In the bias current supply circuit12, particularly in closed-loop circuit20, feedback operation of bias APC with variable bias current Ibis performed so that monitor voltage VM1comes to equal reference voltage VA1. With this feedback operation, the steady state of VM1=VA1is reached, and drive current Ib(Iba+Ibb) sent to laser diode10converges to a constant value. After a prescribed time, S/H circuit34is switched to hold mode. As a result, drive current Ib(Iba+Ibb) is temporarily held to a constant value corresponding to the prescribed optical output.

REFERENCES:
patent: 3947853 (1976-03-01), Denny et al.
patent: 6198497 (2001-03-01), Luque
patent: 6560256 (2003-05-01), Seki et al.
patent: 2001/0046243 (2001-11-01), Schie
patent: 2003/0035451 (2003-02-01), Ishida et al.
patent: 2004/0257839 (2004-12-01), Yang et al.

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