Resonant Fiber Optic Gyroscope Using an Air-Core Fiber

First design of high birefringence and polarising hollow core anti-resonant fibre

“…in gas spectroscopy or in fibre optic gyroscopes (FOG) 2 . However, high performance, low-loss HC with polarisation maintaining properties are not readily available.…”

Analysis of temperature effect in fiber optics ring resonator based on photonic crystal fiber

“…Matthew analyzed the theoretical advantages of RFOG based on PBF, then an open-loop RFOG with a 20-m 7-cell air-core fiber is experimented. Random walk of 1/2 0.055 / s  , a long-term drift with a standard deviation of 0.5 / s  and a peak-to-peak variation of 2.5 / s  over an hour are measured [16].…”

Hybrid air-core photonic bandgap fiber ring resonator and implications for resonant fiber optic gyro

“…Both the phase shifts caused by the optical Kerr effect and the temperature-driven polarization instability seriously deteriorate the long-term bias stability of the RFOG. The emergence of the air-core photonic bandgap fibers (PBFs) offers a novel solution to address performance barriers induced by those nonreciprocal noises [12,13]. Since the most energy of the propagated light is confined by the air-guide mechanism, which is quite different from the conventional solid-core silica fiber, lower nonlinearity and higher thermal stability can be expected from the adoption of the air-core PBFs.…”

“…The air-core PBF ring resonator made by free-space coupling with bulk optics has been demonstrated and shown a very low loss [12], however, its spatial separation structure is not conducive to gyro applications. A simpler all-fiber approach was proposed to close the air-core PBF coil by using a conventional solid-core single-mode fiber optical coupler [13]. However, the splicing loss was high (~2dB per junction) because of the refraction-index mismatch between the two fibers in the splicing point.…”