Infrared Detection Module for Free Space Optics

Free space optics (FSO) communication in LWIR range is less sensitive to atmosphere features. VIGO System S.A. — company from Poland — develops high performance detector module optimized for LWIR range. We present new detection module dedicated to open space optical communication optimized for 10μm. Module specification: Detector: PVI-2TE-10 photodiode with immersion lens, thermoelectrically cooled. Operating temperature range: −30 . . . + 60◦C. Detector temperature stabilization precision: 0.01◦C. Detector time constant: < 1 ns. Preamplifier bandwidth: 100 MHz. Input current noise: 5 pA/ √ Hz. Detector capacity < 5 pF. Detection module is based on PVI-2TE-10 HgCdTe photodiode, thermoelectrically cooled by two stage Peltier cooler. It is optimized for long wavelength — 10μm. TEC controller stabilizes detector temperature with high precision in wide ambient temperature range. Immersion lens enables optimization of the detector physical dimensions, decreasing detector capacity and time constant. Module parameters enables maximum transmission speed 100 Mb/s. Low bit error rate requires correct transmission with low and high signal level. Detector and preamplifier have wide linear working range, noise optimization provides module high detectivity. DC reverse bias increases dynamic resistance and improves frequency response.