A free-space optical communication system using non-mode-selective photonic lantern (PL) based coherent receiver is studied. Based on the simulation of photon distribution, power distribution at single-mode fiber end PL quantitatively described as a truncated Gaussian over simplex. The signal-to-noise ratios (SNRs), bit-error rate (BER), and outage probability selection combining (SC), equal-ga...

We propose a wide field-of-view optical receiver design based on a fisheye lens and an off-axis catadioptric structure for free-space optical communications. The design utilizes a novel fisheye lens group to compress a wide field angle into a narrow field angle and produce the appropriately collimated light that can effectively be coupled into the following aperture of a catadioptric telescope....

The performance of FSO communication link is subject to numerous atmospheric factors in wireless like fog, rainfall, and haze which leads deteriorate the a system term BER power at receiver side. Due advantages OCDMA over other access techniques, it allows various users channel simultaneously without intervention with user. It has ability provide security, large number users, privacy, reduce in...

Unmanned aerial vehicle (UAV) relaying is promising to overcome the challenge of signal blockage in free-space optical (FSO) communications for users dense urban area. Existing works on UAV relay placement are mostly based simplified line-of-sight (LOS) channel models or probabilistic models, and thus fail capture actual LOS status communication link. By contrast, this paper studies three-dimen...

Abstract In recent years, much research has been devoted to free-space optical communication (FSO). The unregulated spectrum, low implementation costs, and robust security of FSO systems all are great importance which lead a wide range applications for links, from terrestrial communications satellite communications. However, the fundamental limitation with links is atmospheric turbulence (AT) c...

We experimentally analyze the performance of a laser communication link using spatial diversity. For various system settings we quantify the cross-correlation between received signals and establish key elements in the design of efficient multiple-transmitter links. ©2010 Optical Society of America OCIS codes: (060.2605) Free-space optical communication; (010.3310) Laser beam transmission.