Laser power control with automatic compensation

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems

Reexamination Certificate

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Details

C250S2140RC, C250S2140LS, C372S038020

Reexamination Certificate

active

10993561

ABSTRACT:
A method and apparatus is disclosed for optic signal power control to maintain a desired or optimum optic signal power level. During start-up, a default or target value from memory may be utilized to bias or otherwise control operation of an optic signal generator or driver. During operation, pre-stored values may continue to be utilized or an open loop or closed loop control system may be utilized. An open loop control system may incorporate a temperature module or a timer module to account for changes in environment or changes due to aging that may undesirably affect system operation. A closed loop control system may incorporate one or more feedback loops that generate a compensation value to account for detected changes. In one configuration one or more peak values of the actual optic signal, or a portion thereof, are detected and processed to generate the compensation signal.

REFERENCES:
patent: 5019769 (1991-05-01), Levinson
patent: 5383208 (1995-01-01), Queniat et al.
patent: 5396059 (1995-03-01), Yeates
patent: 5594748 (1997-01-01), Jabr
patent: 5812572 (1998-09-01), King et al.
patent: 6494370 (2002-12-01), Sanchez
patent: 6952531 (2005-10-01), Aronson et al.

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