Apparatus and method for maintaining constant extinction...

Details Apparatus and method for maintaining constant extinction... Apparatus and method for maintaining constant extinction...

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.

REFERENCES:
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patent: 6771679 (2004-08-01), Schie
patent: 2003/0007525 (2003-01-01), Chen
patent: 2003/0174746 (2003-09-01), Lano et al.
patent: 10-2000-0060107 (2000-10-01), None
patent: 10-2000-0060108 (2000-10-01), None
patent: WO 93-013577 (1993-07-01), None

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