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Optical Engineering

Retrocommunication utilizing electroabsorption modulators and nonmechanical beam steering
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Paper Abstract

A novel retrocommunication link utilizing reflective multiple quantum well (MQW) optical modulators and nonmechanical beam steering and tracking is demonstrated. Large aperture reflective MQW modulators using AlGaAs/GaAs are optimized and manufactured. The modulators exhibit a contrast ratio larger than 4:1 and a modulation bandwidth of 10 MHz. Nonmechanical beam steering and tracking are studied using nematic liquid crystal (NLC) spatial light modulators (SLMs). The communication link is comprised of a retromodulating array with four MQW modulators and a transceiver using a NLC SLM for beam steering and tracking. Transfer of audio, real-time image data and pseudorandom bit sequences over 100-m range while tracking the moving retromodulator is shown. The link is capable of transferring data at approximately 8 Mbps.

Paper Details

Date Published: 1 April 2005
PDF: 8 pages
Opt. Eng. 44(4) 045001 doi: 10.1117/1.1883063
Published in: Optical Engineering Volume 44, Issue 4
Show Author Affiliations
Emil J. Hällstig, Optronic (Sweden)
Johan Öhgren, Swedish Defence Research Agency (Sweden)
Lars Allard, Swedish Defence Research Agency (Sweden)
Lars J. Sjöqvist, Swedish Defence Research Agency (Sweden)
David Engstroem, Chalmers tekniska högskola (Sweden)
Sverker Hard, Chalmers tekniska högskola (Sweden)
Daniel Ågren, Acreo AB (Sweden)
Stéphane Junique, Acreo AB (Sweden)
Qin Wang, Acreo AB (Sweden)
Bertrand Noharet, Acreo AB (Sweden)


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