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Proceedings Paper

Control of a free space adaptive optical interconnect using a VCSEL array transmitter and FLC SLM for beam steering
Author(s): Charley J. Henderson; Brian Robertson; Diego Gil Leyva; Timothy D. Wilkinson; Dominic C. O'Brien; Grahame Faulkner
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Paper Abstract

A demonstrator system for a free space adaptive optical interconnect is reported in which beam position at the receiver plane is maintained using feedback control, given disturbances to the alignment of the optical system. A Liquid Crystal Spatial Light Modulator (SLM) displaying binary phase gratings is used to steer the beam. The design and implementation of the controller is presented, and shown in experimental results to completely correct for step disturbances within one to two sample periods. Extension of the system to tolerate random vibrations is also considered, both in terms of the required SLM technology, and design of the control algorithms. The discussion also highlights some of the trade offs in choosing components when designing for tolerance to different levels of vibration.

Paper Details

Date Published: 8 September 2004
PDF: 10 pages
Proc. SPIE 5453, Micro-Optics, VCSELs, and Photonic Interconnects, (8 September 2004); doi: 10.1117/12.546517
Show Author Affiliations
Charley J. Henderson, Univ. of Cambridge (United Kingdom)
Brian Robertson, Univ. of Cambridge (United Kingdom)
Diego Gil Leyva, Univ. of Cambridge (United Kingdom)
Timothy D. Wilkinson, Univ. of Cambridge (United Kingdom)
Dominic C. O'Brien, Univ. of Oxford (United Kingdom)
Grahame Faulkner, Univ. of Oxford (United Kingdom)

Published in SPIE Proceedings Vol. 5453:
Micro-Optics, VCSELs, and Photonic Interconnects
Hugo Thienpont; Kent D. Choquette; Mohammad R. Taghizadeh, Editor(s)

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