Performance analysis of stationary Hadamard matrix diffusers in free-space optical communication links

Derek J. Burrell; Christopher T. Middlebrook

doi:10.1117/12.2273554

30 August 2017 Performance analysis of stationary Hadamard matrix diffusers in free-space optical communication links

Derek J. Burrell, Christopher T. Middlebrook

Proceedings Volume 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI; 1040807 (2017) https://doi.org/10.1117/12.2273554
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

Wireless communication systems that employ free-space optical links in place of radio/microwave technologies carry substantial benefits in terms of data throughput, network security and design efficiency. Along with these advantages comes the challenge of counteracting signal degradation caused by atmospheric turbulence in free-space environments. A fully coherent laser source experiences random phase delays along its traversing path in turbulent conditions forming a speckle pattern and lowering the received signal-to-noise ratio upon detection. Preliminary research has shown that receiver-side speckle contrast may be significantly reduced and signal-to-noise ratio increased accordingly through the use of a partially coherent light source. While dynamic diffusers and adaptive optics solutions have been proven effective, they also add expense and complexity to a system that relies on accessibility and robustness for successful implementation. A custom Hadamard diffractive matrix design is used to statically induce partial coherence in a transmitted beam to increase signal-to-noise ratio for experimental turbulence scenarios. Atmospheric phase screens are generated using an open-source software package and subsequently loaded into a spatial light modulator using nematic liquid crystals to modulate the phase.

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Derek J. Burrell and Christopher T. Middlebrook "Performance analysis of stationary Hadamard matrix diffusers in free-space optical communication links", Proc. SPIE 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI, 1040807 (30 August 2017); https://doi.org/10.1117/12.2273554

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KEYWORDS

Diffusers

Free space optics

Atmospheric optics

Atmospheric turbulence

Binary data

Data modeling

Radio optics

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