1 April 2005 Retrocommunication utilizing electroabsorption modulators and nonmechanical beam steering
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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 (SPIE)
Emil J. Hällstig, Johan Öhgren, Lars Allard, Lars J. Sjöqvist, David Engstroem, Sverker Hard, Daniel Ågren, Stéphane Junique, Qin Wang, Bertrand Noharet, "Retrocommunication utilizing electroabsorption modulators and nonmechanical beam steering," Optical Engineering 44(4), 045001 (1 April 2005). https://doi.org/10.1117/1.1883063 . Submission:

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