KEYWORDS: Receivers, Avalanche photodetectors, Fast overload recovery, Temperature metrology, Signal detection, Laser range finders, Indium gallium arsenide, Backscatter, LIDAR, Resistors
Optical LIDARs and laser range finders (LRF) require high sensitivity near 1nW while also having fast recovery to overloads as high as 100W peak optical power. Fast overload recovery is required in order to detect subsequent signals after sensing bright targets. In the current work, CMC have created a new family of InGaAs APD LIDAR/LRF receivers, 264-339822-VAR [6] , having a higher dynamic range than most commercially available receivers. While maintaining the existing family of receivers’ bandwidth and APD gain, a 1.8 x increase in responsivity can now be achieved, while reducing the NEP by 12%. In addition, new improvement to the receiver include reducing overload recovery time to 331ns from a laser pulse of 6W peak optical power allowing close secondary target detection, and achieving NEP as low as 184fW/√Hz at +85°C.
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