Invention Grant
US07939790B1 Method and apparatus for controlling the gain of an avalanche photodiode with fluctuations in temperature
失效
用于控制具有温度波动的雪崩光电二极管的增益的方法和装置
- Patent Title: Method and apparatus for controlling the gain of an avalanche photodiode with fluctuations in temperature
- Patent Title (中): 用于控制具有温度波动的雪崩光电二极管的增益的方法和装置
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Application No.: US12041539Application Date: 2008-03-03
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Publication No.: US07939790B1Publication Date: 2011-05-10
- Inventor: Weilong William Lee , Joseph C. Chon , Chiahung Chiu , Wayne Liao
- Applicant: Weilong William Lee , Joseph C. Chon , Chiahung Chiu , Wayne Liao
- Applicant Address: US CA Fremont
- Assignee: Wavesplitter Technologies, Inc.
- Current Assignee: Wavesplitter Technologies, Inc.
- Current Assignee Address: US CA Fremont
- Agency: Mayer & Williams PC
- Agent Stuart H. Mayer
- Main IPC: H03F3/08
- IPC: H03F3/08
Abstract:
A method and apparatus is provided for biasing an avalanche photodiodes (APD). The method includes developing a first output signal s(v1) from the APD when biased with a first bias voltage v1 and developing a second output signal s(v2) from the APD when biased with a second bias voltage v2, wherein s(v)=PRZM(v), (P) is an light power illuminating the APD, R is a responsivity of the APD, M(v) is an APD avalanche gain and Z is a trans-impedance amplifier gain (Z). The method continues by acquiring a ratio r=s(v1)/s(v2)=PRZM(v1)/[PRZM(v2)]=M(v1)/M(v2) and invoking a feedback control method to bias the APD using the ratio r.
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