发明名称 |
Apparatus and method for maintaining constant extinction ratio of laser diode |
摘要 |
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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申请公布号 |
US2007133634(A1) |
申请公布日期 |
2007.06.14 |
申请号 |
US20060635196 |
申请日期 |
2006.12.07 |
申请人 |
LEE JOON K;LEE JYUNG C;KIM KWANGJOON |
发明人 |
LEE JOON K.;LEE JYUNG C.;KIM KWANGJOON |
分类号 |
H01S3/00 |
主分类号 |
H01S3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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