NDLI: Direct-detection free-space laser transceiver test-bed

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Direct-detection free-space laser transceiver test-bed

Content Provider	NASA Technical Reports Server (NTRS)
Author	Principe, Caleb M. Sun, Siaoli Krainak, Michael A. Dabney, Philip W. Merkowitz, Stephen M. Ferrara, Jeffrey F. Fong, Wai H. Martino, Anthony J. Chen, Jeffrey R. Zagwodzki, Thomas W.
Copyright Year	2008
Description	NASA Goddard Space Flight Center is developing a direct-detection free-space laser communications transceiver test bed. The laser transmitter is a master-oscillator power amplifier (MOPA) configuration using a 1060 nm wavelength laser-diode with a two-stage multi-watt Ytterbium fiber amplifier. Dual Mach-Zehnder electro-optic modulators provide an extinction ratio greater than 40 dB. The MOPA design delivered 10-W average power with low-duty-cycle PPM waveforms and achieved 1.7 kW peak power. We use pulse-position modulation format with a pseudo-noise code header to assist clock recovery and frame boundary identification. We are examining the use of low-density-parity-check (LDPC) codes for forward error correction. Our receiver uses an InGaAsP 1 mm diameter photocathode hybrid photomultiplier tube (HPMT) cooled with a thermo-electric cooler. The HPMT has 25% single-photon detection efficiency at 1064 nm wavelength with a dark count rate of 60,000/s at -22 degrees Celsius and a single-photon impulse response of 0.9 ns. We report on progress toward demonstrating a combined laser communications and ranging field experiment.
File Size	708966
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20080032735
Archival Resource Key	ark:/13960/t3sv2k03m
Language	English
Publisher Date	2008-01-19
Access Restriction	Open
Subject Keyword	Lasers And Masers Transmitter Receivers Error Analysis Photomultiplier Tubes Mcgarry Jan. F. Pulse Position Modulation Photocathodes Rangefinding Indium Gallium Arsenides Test Stands Systems Engineering Power Amplifiers Indium Phosphides Ytterbium Optical Communication Laser Applications Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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