Coherent light generators – Particular component circuitry – Controlling current or voltage to laser
Reexamination Certificate
2011-01-11
2011-01-11
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular component circuitry
Controlling current or voltage to laser
C372S038020, C372S029021
Reexamination Certificate
active
07869478
ABSTRACT:
Provided are an apparatus and method for maintaining an constant extinction ratio of a laser diode (LD). The apparatus includes: an automatic power control circuit maintaining the constant optical power of the LD; a correlation deriver deriving correlations between a bias current of the LD and a modulation current to maintain the constant extinction ratio of the LD; and a modulation current control circuit controlling the modulation current to maintain constant the extinction ratio of the LD based on the correlations. The apparatus and method do not use a temperature sensor but derive a relationship between variances of a bias current of the LD and a modulation current according to temperature change, control the modulation current based on the relationship, and maintain the constant extinction ratio of the LD.
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Kim Kwang-joon
Lee Joon Ki
Lee Jyung Chan
Carter Michael
Electronics and Telecommunications Research Institute
Harvey Minsun
Ladas & Parry LLP
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