Proceedings PaperDrift caused by phase-modulator nonlinearities in fiber gyroscopes
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Imperfections of a phase modulator driven below the proper modulation frequency of a fiber gyroscope can cause offset of the output signal, limiting long term stability. Bias drift induced by non-linear effects in the phase modulator was studied and altenative ways of stabilizing a short loop length gyro were implemented. Long term drift figures below 0.2°/h rms were achieved in a highly birefringent fiber gyro with a 160 m-long sensing spool.