12 November 1996 FOG multiplexing by time-shifted phase modulation
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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.
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Thierry P. Gaiffe, Thierry P. Gaiffe, J. Morisse, J. Morisse, Pascal Simonpietri, Pascal Simonpietri, Philippe Martin, Philippe Martin, Herve C. Lefevre, Herve C. Lefevre, } "FOG multiplexing by time-shifted phase modulation", Proc. SPIE 2837, Fiber Optic Gyros: 20th Anniversary Conference, (12 November 1996); doi: 10.1117/12.258171; https://doi.org/10.1117/12.258171
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