12 November 1996 FOG multiplexing by time-shifted phase modulation
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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