Fiber Optics and Optical Communication

Retrocommunication utilizing electroabsorption modulators and nonmechanical beam steering

[+] Author Affiliations
Emil Ha¨llstig, Johan O¨hgren, Lars Allard, Lars Sjo¨qvist

Swedish Defence Research Agency, Department of Laser Systems, P.O. Box 1165, SE 581 11, Linko¨ping, Sweden E-mail: emil@foi.se

David Engstro¨m, Sverker Ha˚rd

Chalmers University of Technology, Photonics Laboratory, SE 412 96, Go¨teborg, Sweden

Daniel A˚gren, Ste´phane Junique, Qin Wang, Bertrand Noharet

Acreo AB, SE 164 40 Kista, Sweden

Opt. Eng. 44(4), 045001 (Apr. 20, 2005). doi:10.1117/1.1883063
History: Received Jul. 23, 2004; Revised Oct. 1, 2004; Accepted Nov. 3, 2004; Apr. 20, 2005; Online April 19, 2005
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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. © 2005 Society of Photo-Optical Instrumentation Engineers.

© 2005 Society of Photo-Optical Instrumentation Engineers

Citation

Emil Ha¨llstig ; Johan O¨hgren ; Lars Allard ; Lars Sjo¨qvist ; David Engstro¨m, et al.
"Retrocommunication utilizing electroabsorption modulators and nonmechanical beam steering", Opt. Eng. 44(4), 045001 (Apr. 20, 2005). ; http://dx.doi.org/10.1117/1.1883063


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