Fast and low noise optical receiver using Si APD for cloud-aerosol LIDAR

摘要: A Fast and Low-noise Optical Receiver using a Silicon Avalanche Photodiode with an internal gain of 100 connected to Broadband Preamplifier Circuit was developed. The optical receiver the receiving optics form detection channel Cloud-Aerosol Lidar Remote Sensing System used measure profiles aerosol cloud backscatter at near-infrared wavelength 1064 nm. While 10 Hz repetition rate solid state pulsed Nd:YAG laser emitting 1.06 μm emission transmission channel. preamplifier circuit 300 MHz bandwidth is capable accommodating pulses ns full width half maximum. matches 50 Ω impedances input output sides. matching reduce Johnson noise hence much better sensitivity achieved. useful when this be other instrumentation requiring impedance or interfaced in cascade increase overall chain. These sides, also allows coupled photodiode fast signals without distortion integration. low level only 1.6 nV/Hz1/2 very good linearity from 1 KHz 280 were achieved, allowing backscattered signal acquisition system distortion. In addition, experimental characterization showed performance lidar channel: Noise Equivalent Power pW/Hz1/2 high Signal-to- Ratio 2 Furthermore, maximal range remote sensing estimated.