Laser drive method and apparatus

Details Laser drive method and apparatus Laser drive method and apparatus

2003-05-22

2008-10-07

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C372S038010, C372S038070

Reexamination Certificate

active

07433377

ABSTRACT:
A laser diode is employed to output light. A laser driver is employed to drive the laser diode. A laser driver control unit is employed to control the driving, such that carrier concentration of the laser is substantially forced to a desired concentration as photon level of the laser initially arrives at a desired level. In one embodiment, the laser driver outputs a drive pulse to drive the laser diode, with the drive pulse having a complex waveform. In one embodiment, the complex waveform includes different transition time periods, and transient rates to raise the drive pulse from an initial level to a peak level. In another embodiment, the complex waveform includes different transition time periods and transient rates to raise the drive pulse from an initial level to a transition peak level and then drop the drive pulse back to an intermediate low level and then finally transition to a final peak level.

REFERENCES:
patent: 5140175 (1992-08-01), Yagi et al.
patent: 5157675 (1992-10-01), Takagi
patent: 5303248 (1994-04-01), Gibbs
patent: 6091747 (2000-07-01), Morita et al.
patent: 6535534 (2003-03-01), Fischer
patent: 6870389 (2005-03-01), Fattaruso

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