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Proceedings Paper

FOG multiplexing by time-shifted phase modulation
Author(s): Thierry P. Gaiffe; J. Morisse; Pascal Simonpietri; Philippe Martin; Herve C. Lefevre
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Paper Abstract

We present a new method to multiplex multi-axis FOGs. A 2 X N coupler is used to share a light source between N Sagnac interferometers. They are all modulated with usual square wave phase modulations, but these modulations are shifted in time by (tau) /N where (tau) is the mean transit time into a coil. The total optical signal coming back from the interferometer is detected with a single photodiode and then demultiplexed. This multiplexing technique has the important advantage to yield a constant bias power even when the powers returning from the various interferometers are not balanced. The closed-loop configuration allows no crosstalk between the N axes far from the cut-off frequency.

Paper Details

Date Published: 12 November 1996
PDF: 8 pages
Proc. SPIE 2837, Fiber Optic Gyros: 20th Anniversary Conference, (12 November 1996); doi: 10.1117/12.258171
Show Author Affiliations
Thierry P. Gaiffe, Photonetics SA (France)
J. Morisse, Photonetics SA (France)
Pascal Simonpietri, Photonetics SA (France)
Philippe Martin, Photonetics SA (France)
Herve C. Lefevre, Photonetics SA (France)


Published in SPIE Proceedings Vol. 2837:
Fiber Optic Gyros: 20th Anniversary Conference
Eric Udd; Herve C. Lefevre; Kazuo Hotate, Editor(s)

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