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Registered APPARATUS AND METHOD FOR MAINTAINING CONSTANT EXTINCTION RATIO OF LASER DIODE
- Inventors
- Lee Jun Ki, Lee Jyung Chan, Kim Kwangjoon
- Application No.
- 11635196 (2006.12.07)
- Publication No.
- 20070133634 (2007.06.14)
- Registration No.
- 7869478 (2011.01.11)
- Country
- UNITED STATES
- Project Code
- 05MT1500, 40Gb/s EDTM Optical Transmission Technology, Ko Je Soo
- 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.
- KSP Keywords
- 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)
- Family
| Status | Patent | Country | KIPRIS |
|---|---|---|---|
| Registered | 레이저 다이오드의 소광비 보상 장치 및 방법 | KOREA |