Optimization of the sinusoidal phase modulation technique in resonant fiber optic gyro

Wang, Linglan; Li, Hanzhao; Zhang, Jianjie; Ma, Huilian; Jin, Zhonghe

doi:10.1016/j.optcom.2016.11.025

Cited by 12 publications

(2 citation statements)

References 16 publications

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“…For the above backscattering noise suppression scheme, it is significant to optimize the modulation frequency, and the amplitude is assumed to exhibit a Lorentzian line shape, given as 26 T(f)=Γ2normalΓ2+(f−f0false)2,where Γ represents the FWHM of the resonant cavity and f0 represents the center frequency of the laser. This formula is derived from Γ≪FSR, and the optimum modulation frequency is Γ/2√3.…”

Section: Principle and Analysismentioning

confidence: 99%

Triple closed-loop resonant micro-optical gyroscope based on optoelectronic hybrid feedback

Nan,

Liu,

Tao

et al. 2024

Opt. Eng.

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The resonant micro optical gyro (RMOG) is considered to be a unique type of optical gyroscope with great application prospects because of its high precision and miniaturization. However, high precision RMOG systems are generally required to have the narrow full width at half maximum (FWHM) of the resonance spectrum. The dynamic range of the open-loop detection method based on FWHM demodulation output is correspondingly narrowed. Therefore, we propose a triple closed-loop control system based on optoelectronic hybrid feedback in this work. First, the sawtooth wave feedback loop is used to the track the angular velocity, which reduces the influence of the nonlinear error and improves the dynamic range of the system. Second, the laser frequency locking loop (LFLL) achieves frequency locking by locking the laser's output frequency at the static resonance frequency of the waveguide ring resonance. Third, the light intensity feedback loop is introduced to reduce the optical Kerr noise by minimizing the light intensity difference between the clockwise (CW) and counterclockwise (CCW) directions. Experimental results show that, when using this method, the dynamic range of the gyroscope system is increased from AE686°∕s to AE5365°∕s compared with the open-loop output detection scheme, which is eight times higher. The light intensity difference between the CW and CCW channels decreases from 7.91 to 0.615 mV. The backscattering noise width under dual phase modulation technology decreases from 9.2 to 0.76 mV. The nonreciprocal noises, mainly optical Kerr noise and backscattering noise, is reduced by about one order of magnitude. The long-term bias stability measurement of the RMOG system is 0.926 °/h.

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Section: Principle and Analysismentioning

confidence: 99%

Triple closed-loop resonant micro-optical gyroscope based on optoelectronic hybrid feedback

Nan,

Liu,

Tao

et al. 2024

Opt. Eng.

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“…Solid-core polarization maintaining photonic crystal fibers (PM-PCFs) have been widely used in optical fiber gyroscopes because of their thermal stability, radiation resistance, design flexibility, and small transverse magnetic field error [1]. However, compared with traditional fibers, the total transmission loss of PM-PCFs is much higher because of their air-glass structure [2].…”

Section: Introductionmentioning

confidence: 99%

Research of Scattering Properties in Solid-Core Polarization-Maintaining Photonic Crystal Fibers

Zheng

Xing-yuan

et al. 2021

Optics

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The scattering from air–glass interfaces within solid-core polarization-maintaining photonic crystal fiber (PM–PCF) will increase the fiber attenuation coefficient, which may lead to high transmission loss. Therefore, it is necessary to describe scattering properties to guide research into reducing fiber loss. In this paper, the loss resulting from roughness scattering at multi-hole interfaces within PM–PCF was theoretically and experimentally analyzed. A PM–PCF scattering model was established to explore the scattering distribution. On the other hand, a fully automatic testing device was built to enable the measurement of a three-dimensional scattering sphere. Simulations were in good agreement with experimental measurements. Moreover, this new proposed measurement method could apply to other PCFs and it will be a useful tool for further scattering research.

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Laser frequency combination tuning and locking technology in resonant optical gyro

et al. 2020

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Optimization of the sinusoidal phase modulation technique in resonant fiber optic gyro

Cited by 12 publications

References 16 publications

Triple closed-loop resonant micro-optical gyroscope based on optoelectronic hybrid feedback

Triple closed-loop resonant micro-optical gyroscope based on optoelectronic hybrid feedback

Research of Scattering Properties in Solid-Core Polarization-Maintaining Photonic Crystal Fibers

Laser frequency combination tuning and locking technology in resonant optical gyro

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