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Proceedings Paper

Spherical transceivers for ultrafast optical wireless communications
Author(s): Xian Jin; Blago A. Hristovski; Christopher M. Collier; Simon Geoffroy-Gagnon; Brandon Born; Jonathan F. Holzman
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Paper Abstract

Optical wireless communications (OWC) offers the potential for high-speed and mobile operation in indoor networks. Such OWC systems often employ a fixed transmitter grid and mobile transceivers, with the mobile transceivers carrying out bi-directional communication via active downlinks (ideally with high-speed signal detection) and passive uplinks (ideally with broad angular retroreflection and high-speed modulation). It can be challenging to integrate all of these bidirectional communication capabilities within the mobile transceivers, however, as there is a simultaneous desire for compact packaging. With this in mind, the work presented here introduces a new form of transceiver for bi-directional OWC systems. The transceiver incorporates radial photoconductive switches (for high-speed signal detection) and a spherical retro-modulator (for broad angular retroreflection and high-speed all-optical modulation). All-optical retromodulation are investigated by way of theoretical models and experimental testing, for spherical retro-modulators comprised of three glasses, N-BK7, N-LASF9, and S-LAH79, having differing levels of refraction and nonlinearity. It is found that the spherical retro-modulator comprised of S-LAH79, with a refractive index of n ≈ 2 and a Kerr nonlinear index of n2 ≈ (1.8 ± 0.1) × 10-15 cm2/W, yields both broad angular retroreflection (over a solid angle of 2π steradians) and ultrafast modulation (over a duration of 120 fs). Such transceivers can become important elements for all-optical implementations in future bi-directional OWC systems.

Paper Details

Date Published: 24 February 2016
PDF: 8 pages
Proc. SPIE 9744, Optical Components and Materials XIII, 97440F (24 February 2016); doi: 10.1117/12.2208343
Show Author Affiliations
Xian Jin, The Univ. of British Columbia (Canada)
Blago A. Hristovski, The Univ. of British Columbia (Canada)
Christopher M. Collier, The Univ. of British Columbia (Canada)
Simon Geoffroy-Gagnon, The Univ. of British Columbia (Canada)
Brandon Born, The Univ. of British Columbia (Canada)
Jonathan F. Holzman, The Univ. of British Columbia (Canada)

Published in SPIE Proceedings Vol. 9744:
Optical Components and Materials XIII
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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