access icon free Performance analysis of free space optical communication in open-atmospheric turbulence conditions with beam wandering compensation control

Among various atmospheric effects, beam wandering is the main cause for the major power loss in free space optical communication (FSOC) which cannot be resolved without incorporating the beam wandering compensation (BWC) control. To prove this prerequisite, a 155 Mbps data transmission experimental setup is built with necessary optoelectronic components for the link range of 0.5 km at an altitude of 15.25 m. A neuro-controller is developed inside the field programmable gate array and used to stabilise the received beam at the centre of the detector plane so as to perfectly couple the power in the bucket to the optical detector. The Q-factor and bit error rate variation profiles are calculated using the signal statistics obtained from the eye-diagram. The performance improvements on the FSOC system due to the incorporation of BWC control are investigated and discussed in terms of various communication quality assessment key parameters.

Inspec keywords: beam steering; free-space optical communication; error statistics; neurocontrollers; field programmable gate arrays; atmospheric turbulence; Q-factor; telecommunication computing; compensation; optoelectronic devices

Other keywords: performance analysis; Q-factor; optical detector; free space optical communication; power loss; open-atmospheric turbulence conditions; bit rate 155 Mbit/s; field programmable gate array; bit error rate variation profiles; altitude 15.25 m; neurocontroller; signal statistics; atmospheric effects; optoelectronic components; beam wandering compensation control; FSOC system

Subjects: Neural net devices; Laser beam interactions and properties; Logic and switching circuits; Other topics in statistics; Logic circuits; Free-space optical links; Other topics in statistics; Neural computing techniques; Communications computing

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-com.2015.0717
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content/journals/10.1049/iet-com.2015.0717
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