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Proceedings Paper

Optical communications between moving transceivers using double phase-conjugation beam tracking
Author(s): Alexander S. Kuzhelev; Alexander E. Dudelzak; Michael Maszkiewicz; Daniel Gratton; Louis Hotte
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Paper Abstract

High bit-rate laser communications have been increasingly studied for applications ranging from short-distance transmissions to inter-spacecraft links. Optical communications involving moving parties require precise beam pointing and mutual tracking of communicating transceivers. Current approaches based on electro-mechanical beam steering are limited by the need for large volumes of beam-addressing computing and difficulties in providing automatic tracking/pointing capabilities to compensate for rapid changes in directivity patterns, transmitters’ relative misplacement and jitter [1]. An all-optical adaptive beam-tracking approach, proposed by some of the authors earlier, is based on the double phase conjugation effect (DPC) [2]. No mechanical steering, positioning or addressing computing are needed for fine tracking in such a bi-directional optical link. The approach efficiency strongly depends on non-linear properties of the used optical materials, which have been thoroughly studied [3]. This paper presents the results of theoretical analysis and further experimental studies of the DPC all-optical tracking technology. In the experiment, two optical terminals were linked with a modulated laser signal at a telecommunication wavelength. A DPC-mirror was a multi-layer liquid-crystal stack with a giant optical nonlinearity. The tracking and communication capabilities were simultaneously demonstrated in a range of angles, transmission rates and laser power levels. The experiment was in good agreement with the theoretical model. REFERENCES 1. E Lerner, Laser Focus World 36 11 2000 2. A Dudelzak, A Kuzhelev, A Novikov, G Pasmanik, Patent Application 12346-US-Prov 2002 3. A Kuzhelev, A Dudelzak, J Opt A: Pure and App Opt 5 L5 2003

Paper Details

Date Published: 20 December 2004
PDF: 12 pages
Proc. SPIE 5577, Photonics North 2004: Optical Components and Devices, (20 December 2004); doi: 10.1117/12.567503
Show Author Affiliations
Alexander S. Kuzhelev, Canadian Space Agency (Canada)
Alexander E. Dudelzak, Canadian Space Agency (Canada)
Michael Maszkiewicz, Canadian Space Agency (Canada)
Daniel Gratton, Canadian Space Agency (Canada)
Louis Hotte, Canadian Space Agency (Canada)

Published in SPIE Proceedings Vol. 5577:
Photonics North 2004: Optical Components and Devices
John C. Armitage; Simon Fafard; Roger A. Lessard; George A. Lampropoulos, Editor(s)

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