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| Noise Temperature Characteristics and Gain-control of Avalanche Photodiodes for Laser Radar | |
| 作者姓名： | CAI Xi-ping SHANG Hong-Bo BAI Ji-yuan YANG Shuang WANG Li-na |
| 作者单位： | CAI Xi-ping:School of Physics Science and Technology, Heilongjiang University, Harbin 150001, CHN SHANG Hong-Bo:School of Physics Science and Technology, Heilongjiang University, Harbin 150001, CHN BAI Ji-yuan:School of Physics Science and Technology, Heilongjiang University, Harbin 150001, CHN YANG Shuang:School of Physics Science and Technology, Heilongjiang University, Harbin 150001, CHN WANG Li-na:School of Physics Science and Technology, Heilongjiang University, Harbin 150001, CHN |
| 基金项目： | Young Scientist Research Fund of Heilongjiang University(QL200508) |
| 摘 要： | Avalanche photodiodes（APDs） are promising light sensors with high quantum efficiency and low noise. It has been extensively used in radiation detection, laser radar and other weak signal detection fields. Unlike other photodiodes, APD is a very sensitive light detector with very high internal gain. The basic theory shows that the gain of APD is related to the temperature. The internal gain fluctuates with the variation of temperature. Investigated was the influence of the variation of the gain induced by the fluctuation of temperature on the output from APD for a very weak laser pulse input in laser radar. An active reverse-biased voltage compensation method is used to stabilize the gain of APD. An APD model is setup to simulate the detection of light pulse signal. The avalanche process, various noises and temperature＇s effect are all included in the model. Our results show that for the detection of weak light signal such as in laser radar, even a very small fluctuation of temperature could cause a great effect on APD＇s gain. The results show that the signal-tonoise ratio of the APD＇s output could be improved effectively with the active gain-control system. |
| 关 键 词： | 雪崩光电二极管 噪音特征 增益控制 激光雷达 |
| 收稿时间： | 2008/7/17 |
Noise Temperature Characteristics and Gain-control of Avalanche Photodiodes for Laser Radar |
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| CAI Xi-ping,SHANG Hong-Bo,BAI Ji-yuan,YANG Shuang,WANG Li-na.Noise Temperature Characteristics and Gain-control of Avalanche Photodiodes for Laser Radar[J].Semiconductor Photonics and Technology,2008,14(4):268-273. | |
| Authors: | CAI Xi-ping SHANG Hong-Bo BAI Ji-yuan YANG Shuang WANG Li-na |
| Affiliation: | School of Physics Science and Technology, Heilongjiang University, Harbin 150001, CHN |
| Abstract: | Avalanche photodiodes(APDs) are promising light sensors with high quantum efficiency and low noise. It has been extensively used in radiation detection, laser radar and other weak signal detection fields. Unlike other photodiodes, APD is a very sensitive light detector with very high internal gain. The basic theory shows that the gain of APD is related to the temperature. The internal gain fluctuates with the variation of temperature. Investigated was the influence of the variation of the gain induced by the fluctuation of temperature on the output from APD for a very weak laser pulse input in laser radar. An active reverse-biased voltage compensation method is used to stabilize the gain of APD. An APD model is setup to simulate the detection of light pulse signal. The avalanche process, various noises and temperature's effect are all included in the model. Our results show that for the detection of weak light signal such as in laser radar, even a very small fluctuation of temperature could cause a great effect on APD's gain. The results show that the signal-to-noise ratio of the APD's output could be improved effectively with the active gain-control system. |
| Keywords: | avalanche photodiode noise characteristics gain-control laser radar |
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