Abstract
Polarization error and temperature noise are two main limits to the performance of resonant fiber optic gyroscope (RFOG). To overcome these limits, we demonstrated a hybrid resonator consisting of a polymer-based long-range surface plasmon polariton (LRSPP) waveguide coupler and a silica fiber. Single-polarization property of LRSPP waveguide and the offsetting of the opposite thermo-optical characteristics between the polymer-based LRSPP waveguide and the silica fiber can effectively inhibit both the polarization error and the temperature noise of RFOG. The measured resonance spectrum of the hybrid resonator shows the absence of polarization noise. The temperature dependence of wavelength shift (TDWS) of resonator dropped to about 2 pm/°C, or even to 0 pm/°C with optimal structure, which dramatically improves the temperature stability of gyroscope system. In addition, the hybrid resonator also shows tremendous application potential in rate-grade and tactical-grade gyroscopes.
Highlights
To overcome these limits, efforts have been made during the past decades
When the silver strip was lighted by the red light, as shown in Fig. 3(b), the fiber was aligned with the arm of long-range surface plasmon polariton (LRSPP) waveguide coupler
We demonstrated a novel hybrid resonator consisting of a polymer-based LRSPP coupler and a silica fiber to suppress the polarization noise and the temperature noise in resonant fiber optic gyroscope (RFOG) system
Summary
Many resonator schemes have been proposed to reduce the polarization noise, including polarization-maintaining fiber (PMF) resonator employing polarization controller (PC) or fiber polarizer, PMF resonator with 90° polarization-axis rotated splice[7], hollow-core photonic bandgap fiber (PBF) resonator[8,9], single-mode fiber resonator composed of two parts of oppositely twisted fiber[10] and etc. This hybrid resonator provides a very efficient solution to simultaneously inhibit polarization noise and temperature noise in RFOG, and promotes the rate-grade and tactical-grade RFOGs to be practical
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