Coherent techniques in optical wireless communications

The optical wireless communications systems are an important alternative for providing high bandwidth over short or medium range links. Although, most of such links are currently, based in no-coherent schemes, there exist the optical coherent techniques offering a greater sensitivity and selectivity at the receiver stage and the possibility of impairments compensation using high-speed post-detection DSP algorithms. We present the a scheme to demonstrate the use of the optical coherent technique in wireless communications for a last-mile application under turbulence, in the laboratory scope.