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One of the causes of power loss in a free-space optical communication link is beam motion or received spot wander. The power spectrum of the spot motion indicates that most of the frequency content is less than ~500 Hz. A fast steering mirror (FSM) controlled by a position-sensing detector (PSD) has the potential to correct for a significant portion of the(More)
Optical modulating retroreflectors (MRRs) were demonstrated before the invention of the laser, but were restricted to short distances and low data rates. Recent advances in optoelectronic devices and free space optics have greatly increased the capabilities of MRR systems. Several modulator technologies have been used in MRR systems and compared elsewhere.(More)
1) Research Support Instruments, Inc., 4325-B Forbes Blvd., Lanham, MD. 20706 2) U.S. Naval Research Laboratory, Code 8123, Advanced Technology Branch, 4555 Overlook Ave., SW, Washington, D.C. 20375 3) Jaycor/Titan, Inc., 1410 Spring Hill Rd., McLean, VA. 22102. 4) Honeywell T.S.I., 7515 Mission Drive, Lanham, MD 20706 5) U.S. Naval Research Laboratory,(More)
The U. S. Naval Research Laboratory (NRL) and OptoGration, Inc. have collaborated in the development and testing of large area, high speed InGaAs avalanche photodiode (APD) receivers for use in free-space lasercom systems. A 200 micron diameter InGaAs APD receiver has been tested in a free-space lasercom testbed and has demonstrated sensitivities of -42.4(More)
NRL’s Chesapeake Bay lasercom test facility (LCTF) offers a variety of ranges for researching free-space optical laser communication (FSO lasercom) links in a maritime environment. This paper discusses link performance over the 16 km one-way range at the LCTF. There are several methods to determine the link quality in FSO lasercom. Bit-error-rate (BER)(More)
In this paper, we summarize progress in free space laser propagation research at the U.S. Naval Research Laboratory, specifically in the context of propagating and detecting signals through the atmosphere in a maritime environment. Transmission through the atmosphere over large bodies of water presents different challenges than transmission through the(More)
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