title: Retro-detective control structures for free-space optical communication links.
abstract: A corner-cube-based retro-detection photocell is introduced. The structure consists of three independent and mutually perpendicular photodiodes (PDs), whose differential photocurrents can be used to probe the alignment state of incident beams. These differential photocurrents are used in an actively-controlled triangulation procedure to optimize the communication channel alignment in a free-space optical (FSO) system. The active downlink and passive uplink communication capabilities of this system are demonstrated.
authors.affiliation: Integrated Optics Laboratory, School of Engineering, University of British Columbia Okanagan, Kelowna, BC, V1V 1V7, Canada.
authors.forename: Xian
authors.initials: X
authors.lastname: Jin
authors.forename: Jason E
authors.initials: JE
authors.lastname: Barg
authors.forename: Jonathan F
authors.initials: JF
authors.lastname: Holzman
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D010783:Photometry / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*; D014159:Transducers