Coherent light generators – Particular component circuitry – For driving or controlling laser
Reexamination Certificate
2007-07-10
2010-06-15
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular component circuitry
For driving or controlling laser
C372S038100
Reexamination Certificate
active
07738519
ABSTRACT:
A laser driver circuit includes a laser APC circuit receiving a monitor current indicative of the average optical output power of a laser diode and providing a bias adjust signal for adjusting a bias current for the laser diode. The laser APC circuit includes a first non-linear impedance circuit receiving the monitor current and generating a first voltage using a first non-linear current-to-voltage transfer function, a second non-linear impedance circuit receiving a reference current and generating a second voltage and being implemented using the same or a scaled version of the first non-linear current-to-voltage transfer function, and a comparator for comparing the first voltage with the second voltage and providing the bias adjust signal indicative of the difference between the first and second voltages. The first non-linear current-to-voltage transfer function has difference resistance portions for increasing the dynamic range of the current-to-voltage conversion.
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“Laser Driver with Automatic Power Control,” Micrel SY88952L Data Sheet, pp. 1-7.
Cook Carmen C.
Harvey Minsun
Micrel Inc.
Patent Law Group LLP
Stafford Patrick
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