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Open-loop output and scale factor stability in a fiber-optic gyroscope

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3 Author(s)
Moeller, R.P. ; US Naval Res. Lab., Washington, DC, USA ; Burns, W.K. ; Frigo, N.J.

An all-fiber open-loop, fiber-optic interferometric gyro with polarization-preserving fiber with 14-dB insertion loss and 20-dB polarization extinction is described. The random drift coefficient is 3.2*10/sup -40// square root h for a 1-km coil length on a 16-cm radius. Bias drift is within 0.03 degrees /h over three days. Source coherence effects and optical feedback are shown to result in additional terms in the demodulated output, which can be corrected for. A procedure for obtaining scale-factor coefficients is described. With modeling for temperature and source drive current, these coefficients are measured to be stable within 32 p.p.m. over 12 days.<>

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Lightwave Technology, Journal of  (Volume:7 ,  Issue: 2 )