title: Uniform free-space cell shaping using diffractive-type beam diffusers for optical wireless links.
abstract: This Letter presents the design of a diffractive beam diffuser to homogenize the irradiance within optical free-space cells generated from multimode fibers in an indoor high-speed network environment. Native speckled beams with a Gaussian envelope are transformed into circular flat-top distributions to guarantee a constant signal-to-noise ratio at the wireless receiving stage. Design considerations followed by the device fabrication and test results are given, showing its ability to shape narrow line-of-sight optical wireless cells operating at the Gbps range.
authors.forename: Hani
authors.initials: H
authors.lastname: Al Hajjar
authors.forename: Bruno
authors.initials: B
authors.lastname: Fracasso
authors.forename: Kevin
authors.initials: K
authors.lastname: Heggarty