Accession Number : AD0915934

Title :   1.06 Micron Sensor Array for Track and Receive.

Descriptive Note : Final rept. Feb 72-Dec 73,


Personal Author(s) : Eden,Richard C.

Report Date : DEC 1973

Pagination or Media Count : 92

Abstract : The development of a 12-element array of inverted heterojunction III-V alloy microwave avalanche photodiodes for use for data detection and tracking in a 10 to the 9th power bit/second satellite-to-satellite 10.06 micron laser communications system is reported. The three arrays delivered under the terms of this contract have quantum efficiencies (constant from dc to microwave) of about 95% at the 1.064 Nd-YAG laser line, narrow band photoresponse characteristics (750A FWHM), extremely low capacitance (0.3pf/inner quadrant element), very short transit times (<100ps), and low leakage currents. Microwave avalanche gains up to 15db were measured on these arrays, with all of this gain available before the onset of excess detector noise. By virtue of their high quantum efficiencies, even with their present gain levels and 'off-the-shelf' 50 OHM preamps these devices should considerably outperform any other available 1.06 micron detector for gigabit data reception; however, this effort did not include performance measurements in a communications system. With an optimized preamplifier design, data reception with under 1000 photons/bit at the detector should be possible, or even less as higher gains are achieved with these devices. (Author)

Descriptors :   (*Infrared detectors, *Infrared communications), (*Infrared tracking, *Infrared receivers), (*Satellite communications, Space to space), (*Laser communications, Infrared lasers), (*Photodiodes, Avalanche diodes), Pulse communications, Response, Photons, Neodymium lasers, Near infrared radiation, Infrared pulses, Quantum efficiency, Yttrium aluminum garnet, Gain, Noise(Radio), Preamplifiers, Digital systems, Microwave equipment, Arrays, Gallium arsenides, Gallium antimonides, Semiconductors

Subject Categories : Lasers and Masers
      Infrared Detection and Detectors
      Solid State Physics
      Unmanned Spacecraft
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE