Atmospheric and Ocean Optics

Interference effects and aperture averaging in retroreflected light

[+] Author Affiliations
Rita Mahon

L-3Comm/Titan Group,11955 Freedom Drive, Reston, Virginia 20190

William S. Rabinovich

U.S. Naval Research Laboratory,4555 Overlook Avenue SW, Washington, DC 20375

Mark Plett

LPS, University of Maryland,College Park, Maryland 20742

Harris R. Burris, Mike S. Ferraro

U.S. Naval Research Laboratory,4555 Overlook Avenue SW, Washington, DC 20375

Wade T. Freeman

SmartLogic Solutions,Virginia 20136

Christopher I. Moore, James Murphy

U.S. Naval Research Laboratory,4555 Overlook Avenue SW, Washington, DC 20375

Mena Stell

Research Support Instruments,4325-B Forbes Boulevard, Lanham, Maryland 20706

Michelle R. Suite

U.S. Naval Research Laboratory,4555 Overlook Avenue SW, Washington, DC 20375

Opt. Eng. 47(4), 046002 (May 01, 2008). doi:10.1117/1.2911029
History: Received July 23, 2007; Revised December 17, 2007; Accepted January 24, 2008; Published May 01, 2008
Text Size: A A A

An experimental study has been made on the contribution to the effective scintillation index due to aperture averaging and interference effects when using multiple retroreflectors in free-space optical links. These studies are of relevance to asymmetric data links where modulating retroreflectors are used at the remote end of the free-space optical link. For closely spaced retroreflectors the effect of coherent interference at the receiver is seen to increase the effective variance of the received signal, whereas spatial averaging is apparent for more widely spaced retroreflectors. The scintillation index, probability density functions, and fade rates are all affected by the interference. Experiments were conducted over both a short-range (500 to 800m) and a long-range (16km) link. The long-range link used three retroreflectors having a spacing that was large enough that interference effects contributed minimally to the observed variance. However, the variance clearly depended on the number of retroreflectors. In addition to measuring the scintillation index, images of the returned light were recorded using a fast framing camera. These experiments were conducted over land and mixed water-land terrains in the case of the short-range links, and exclusively over water in the case of the 16-km link from Chesapeake Beach to Tilghman Island.

Figures in this Article
© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Rita Mahon ; William S. Rabinovich ; Mark Plett ; Harris R. Burris, Jr. ; Mike S. Ferraro, et al.
"Interference effects and aperture averaging in retroreflected light", Opt. Eng. 47(4), 046002 (May 01, 2008). ; http://dx.doi.org/10.1117/1.2911029


Tables

Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.