레이저 다이오드의 소광비 보상장치 및 방법
이준기, 이정찬, 김광준
- 7869478 (2011.01.11)
- 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.
- KSP 제안 키워드
- Automatic power control, Control Circuit, Current Control, Laser diode(LD), Modulation Current, Optical power, Power control(PC), Temperature change, bias current, extinction ratio, temperature sensor(LM35)