Bias reduction by polarisation dispersion in the fibre-optic gyroscope

Jones, E. D.; Parker, J.W.

doi:10.1049/el:19860037

Cited by 33 publications

(9 citation statements)

References 1 publication

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“…11, when input fiber is present, errors ψ 2;3 are anyway considerably reduced by PZ-coil, but there is one special condition of their radical suppression to an arbitrary small level, as was expected in Ref. 10. This condition has a simple form:…”

Section: Polarization Errors In Fiber Loop Interferometermentioning

confidence: 74%

“…Moreover, although ψ 1 ∼ ε 2 , it could be effectively suppressed by FLI polarizer. For this purpose, several FLI schemes were suggested using an additional hi-bi optical element before or after the polarizer 10 for input x-and y-waves total decoherence, which should lead to ψ 2;3 ¼ 0. We further assume that it is hi-bi input fiber before the polarizer, although it also could be a protonexchanged input waveguide of integrated optic chip (IOC).…”

Section: Polarization Errors In Fiber Loop Interferometermentioning

confidence: 99%

“…10, a high-order PMC is not considered in coil fiber. There is no need to do this for minimal FLI, but with input hi-bi fiber there will be small residual PNRs due to high-order PMC, which may set a new limitation on ψ 2;3 suppression.…”

Section: Polarization Errors In Fiber Loop Interferometermentioning

confidence: 99%

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Polarization and modal filters based on W-fibers Panda for fiber-optic gyroscopes and high-power fiber lasers

Kurbatov

2013

Opt. Eng

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Abstract. Polarizing Panda-type W-fibers, practical realizations are presented for fiber-optic gyroscope (FOG) sensing coil (500-m length, 8-μm fundamental mode field diameter) and for polarization/modal filtering at the FOG loop interferometer input (∼1-m length, 10-μm fundamental mode field diameter). Using these fibers, two different mathematical models for light propagation are tested and applied for further dichroism spectral band spreading of polarizing W-fibers with fundamental mode field diameter (MFD) of 6 to 10 μm for FOG coil and at least with MFD ¼ 8 to 10 μm for input filtering in loop interferometer. Also, some fibers with large MFD are considered, which may be useful for high-power fiber lasers, requiring the low nonlinear effects. One is a practically realized single-mode 200-m W-fiber Panda with dichroism and MFD ¼ 12.4 μm at 1.06 μm, which is bend resistant for 60-mm diameters. For further MFD increase a straight 100-mm length modal and polarization filters are suggested with MFD ¼ 30 to 70 μm at 1.06 μm, based on a pure silica core fiber, narrow/shallow fluorine cladding, and stress-applying parts. The latter are used for core refractive index regulation by birefringence (W-profile forming), which is more precise than with core germanium doping. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Polarization Errors In Fiber Loop Interferometermentioning

confidence: 74%

Section: Polarization Errors In Fiber Loop Interferometermentioning

confidence: 99%

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Polarization and modal filters based on W-fibers Panda for fiber-optic gyroscopes and high-power fiber lasers

Kurbatov

2013

Opt. Eng

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“…Methods based on polarization controlling were unusually used for bias drift reduction [15][16][17][18][19]. In addition, it is also possible for reducing bias drift without changing optical components of the IFOG.…”

Section: Introductionmentioning

confidence: 99%

Quadrature demodulation with synchronous difference for interferometric fiber-optic gyroscopes

Wang¹,

Yang²,

Li³

et al. 2012

Opt. Express

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We propose a novel method of quadrature demodulation with synchronous difference for suppressing noise in interferometric fiber-optic gyroscopes (IFOGs). For an IFOG with sine wave phase modulation, an in-phase result and a quadrature result are obtained simultaneously by coherent detection. Eigenfrequency modulation is used and a phase shift of 45° is set between the modulation signal and the reference signal, so that two results have the same expectation of amplitude but with opposite signs. A synchronous difference procedure is carried out for output, in which signals are added up and common noise between two results is eliminated. Theoretical analysis and experimental results show that both short term noise and long term instability of the IFOG are reduced by this method. In experimental comparison with the traditional demodulation method on the same IFOG with a 1982 m fiber coil, this method reduces the bias drift from 0.040°/h to 0.004°/h.

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“…In the development of navigation grade IFOG, it is necessary to pay attention to the birefringence induced polarization non-reciprocity caused by the considerable influence of imperfect polarization characteristics between constitutive optical components on the bias stability [3]. The related theories have been well established and many solutions have been suggested utilizing a polarizer with the common input/output port of the Sagnac closed loop [4][5][6]. Intensity-typed phase error due to the interference between the main polarization mode and the crosscoupled secondary polarization mode is bounded by the value proportional to the square of the amplitude extinction coefficient of the polarizer as follows [7], 2 2 ε ρ φ r e < Δ (1) where   is intensity-typed phase error due to the polarization cross-coupling,  is the amplitude extinction coefficient of the polarizer,  r 2 is the intensity ratio of the cross-coupled mode to the main polarization mode.…”

Section: Introductionmentioning

confidence: 99%

Accurate Evaluation of Polarization Characteristics in the Integrated Optic Chip for Interferometric Fiber Optic Gyroscope Based on Path-matched Interferometry

Choi¹,

Jo²

2009

Journal of the Optical Society of Korea

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Accurate evaluation of polarization characteristics in the integrated optic chip (IOC) for interferometric fiber optic gyroscope was performed. Spatial distribution of optical wavetrains caused by the polarization parameters such as local polarization cross-coupling and polarization rejection coefficient of the IOC were measured utilizing the path-matched optical coherence domain polarimetry (PM-OCDP). With the analytic model deduced from Jones matrix representation, we could accurately identify the polarization characteristics of the IOC. Both degree of measurement error due to the imperfect equipment conditions in PM-OCDP and birefringence of IOC chip were also characterized.

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Bias reduction by polarisation dispersion in the fibre-optic gyroscope

Cited by 33 publications

References 1 publication

Polarization and modal filters based on W-fibers Panda for fiber-optic gyroscopes and high-power fiber lasers

Polarization and modal filters based on W-fibers Panda for fiber-optic gyroscopes and high-power fiber lasers

Quadrature demodulation with synchronous difference for interferometric fiber-optic gyroscopes

Accurate Evaluation of Polarization Characteristics in the Integrated Optic Chip for Interferometric Fiber Optic Gyroscope Based on Path-matched Interferometry

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