Parameter optimization analysis to minimize the polarization error in a localized thermal tunable fiber ring resonator gyro

Abstract

The accuracy of the resonant frequency servo loop is a major concern for the high-performance operation of a resonant fiber optic gyro. For instance, a bias error as large as tens or even hundreds of degrees/hour has been observed at the demodulated output of the resonant frequency servo loop. The traditional frequency servo mechanism is not an efficient tool to address this problem. In our previous work, we proposed a novel method to minimize the laser frequency noise to the level of the shot noise by refractive index modulation by a thermally tunable resonator. In this paper, we performed the parameter optimization for the resonator coil, multifunction integrated-optics chip, and couplers by the transition matrix using the Jones matrix methodology to minimize the polarization error. With the optimized parameter values, we achieved the bias value of the resonator fiber optic gyro to 1.924°/h.

Directions of development of optical gyroscopes based on passive ring resonators

“…In subsequent works, completed in the 21st century, the described approach was used at times [14,15].…”

“…Also, the shape of the resonance curve is distorted by cross-polarization interference [5,61]. To reduce the magnitude of the error caused by polarization fluctuations, either stabilization of the position of the eigenfrequencies of one of the orthogonal polarizations in the middle of the intermode interval of the other polarization [14,[62][63][64] is required, or passive ring resonators with polarization-dependent losses, i.e., supporting only one polarization state, are used [28,35,43,65,66].…”

Temperature Stability of a Hybrid Polarization-Maintaining Photonic Crystal Fiber Resonator and Its Application in a Resonant Fiber Optic Gyro

“…The undesired ESOP, ESOP2, drifts through the desired ESOP as the temperature of the FRR varies, thus degrading the gyro performance [ 13 , 16 ]. Various research groups have proposed different resonator schemes to overcome polarization-fluctuation, such as a single 90° polarization-axis rotated splice, twin 90° polarization-axis rotated splices, construction of a hybrid single-polarization FRR, and the use of a polarization controller [ 9 , 10 , 11 , 12 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ].…”

Hybrid fiber resonator employing LRSPP waveguide coupler for gyroscope

“…Resonant fiber optic gyroscope (RFOG) based on Sagnac effect has been considered as a promising candidate for the new-generation inertial navigation system123. In practice, its performance to date is still below expectation due to various effects that produce noises.…”