Polarization nonreciprocity suppression of dual-polarization fiber-optic gyroscope under temperature variation

Abstract

Polarization nonreciprocity (PN) is one of the most critical factors that degrades the performance of interferometric fiber-optic gyroscopes (IFOGs), particularly under varying temperature. We present an experimental investigation of PN error suppression in a dual-polarization IFOG. Both experimental results and theoretical analysis indicate that the PN errors of the two orthogonally polarized light waves always have opposite signs that can be effectively compensated despite the temperature variation. As a result, the long-term stability of the IFOG has been significantly improved. This study is promising for reducing the temperature fragility of IFOGs.

Differential Fiber Optic Gyroscope Driven by Two Broadband Sources of Different Wavelengths

“…Techniques such as electronic RIN subtraction [6], optical RIN subtraction [7], using an interferometric filter [8] and application of the Wiener filter [9] have been developed to reduce the RIN and good performance has been achieved. The bias drift is largely caused by time-varying temperature gradient along the fiber [10], [11], which can be reduced effectively by symmetric fiber-winding [12], proper mechanical packaging [13], adopting a heating insulation cavity [14], and other methods [15], [16]. However, the bias stability of current FOGs is still limited by the effect of transient temperature and further reduction or elimination of errors due to this effect, The associate editor coordinating the review of this manuscript and approving it for publication was Muguang Wang .…”

Two-Port Noise Suppression in Dual-Polarization Interferometric Fiber-Optic Gyroscope

“…Although the PN errors inevitably accompany with both polarizations, they have opposite signs thus can cancel out, or say compensated, optically or electronically. A series of investigation shows that the dual-polarization IFOGs have various benefits in the temperature [8], [9] and magnetic field [10] stability, as well as cost-effectiveness [11]. In dual-polarization configuration, one interesting and important fact is that the compensation of PN errors is valid for both reciprocal and non-reciprocal ports [4], [5], [11], [12].…”