Features of a fiber ring interferometer

Andronova, I. A.; Bershtein, I. L.

doi:10.1007/bf02150325

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…To compare the calculations and the experimental results obtained during determination of the threshold sensitivity, we will use the formula for the threshold rotation velocity Ω thr determined by the shot noise of the photoelectric current and the noise of the radiation source at the output of the fiber ring interferometer, which were considered in [16]:…”

Section: Institute Of Appliedmentioning

confidence: 99%

Double-polarization fiber ring interferometer based on a single-mode isotropic fiber for gyroscopy

Gelikonov

Геликонов

Andronova

2008

Radiophys Quantum El

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We propose and implement the scheme of a whole-fiber double-polarization ring interferometer based on an isotropic fiber for gyroscopy purposes. The results of an experimental study of the output signal of the interferometer based on the proposed scheme are presented. The shift of the zero point of the interferometer signal (at a level of 3 • /h) and the drift of the zero point (at a level of 1 • /h) are determined. The rotation sensitivity of the interferometer is measured. It amounts to 0.1•/h, which agrees well with the calculation allowing for the shot noise of the photoelectric current at the output of the scheme.Recently, the fiber gyroscopy based on fiber ring interferometers has reached the level of industrial manufacturing. A number of companies in the world (see review papers [1, 2]) manufacture fiber gyroscopes using anisotropic filaments. Some companies produce a special anisotropic noncircular D-fiber which is convenient for the development of dividers and polarizers. However, it should be noted that anisotropic fibers are much more expensive than isotropic ones (by a factor of up to 100). Therefore, designers can be interested in studying the possibility to use isotropic fibers in gyroscopes having medium accuracy ratings. It is the purpose of the present paper to demonstrate the features of the proposed scheme using an isotropic fiber. This scheme allows one to obtain low values of the zero-point shift and drift of the interferometer signal and achieve the device sensitivity at a level of 0.1 • /h. This sensitivity is close to the ultimate sensitivity determined by the quantum (shot) noise and the noise of the radiation source. It will be clear from the further discussion that the sensitivity can be increased by increasing the power of the source and decreasing its noise. The noise level can be decreased by extending the source bandwidth or compensating the noise by allowing for the phase increment of the waves in the circuit. The latter requirement complicates development of schemes with compensation. Studying the reasons for the appearance of parasitic signals at the output of a fiber ring interferometer and the ways for their removal (see our works [2, 4] and works [5, 10] of other authors) made it possible to develop the criteria for the positioning and adjustment of the components of the isotropic-fiber ring interferometer, under which the additional signals not related to the rotation are absent at the output. These criteria are as follows.1. The difference between the optical paths of induced polarization modes of the circuit fiber whose anisotropy is determined by winding of the isotropic fiber on a coil with a sufficiently small radius should exceed the coherence length of the used light source. The relation of the birefringence to the winding radius and the diameters of the core and the shell is given in [1; p. 67]. The achieved incoherence of the waves transmitted along the orthogonal anisotropy axes of the circuit allows one to reduce the influence of the

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Section: Institute Of Appliedmentioning

confidence: 99%

Double-polarization fiber ring interferometer based on a single-mode isotropic fiber for gyroscopy

Gelikonov

Геликонов

Andronova

2008

Radiophys Quantum El

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“…For P 0 > P 0 thr and P eff = 0, we have G(0) = 1 and the threshold rotation velocity Ω R sp does not depend on the source radiation P 0 . For comparison with the sensitivity of the conventional (nonresonant) FRI, we write, following [23], the expression for the threshold rotation velocity…”

Section: A Andronova * and P A Shilyaginmentioning

confidence: 99%

Influence of a Regenerative Amplifier on the Sensitivity of a Resonant Fiber Ring Interferometer to Rotation

Andronova

Shilyagin

2005

Radiophys Quantum Electron

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We consider the possibility of using a regenerative amplifier based on an intracavity active fiber to enhance the rotation sensitivity of the resonant fiber ring interferometer (RFRI) with an external reflector and a low-coherence source. The influence of amplifier noise on the RFRI sensitivity to rotation is discussed. It is shown that the use of a regenerative amplifier makes it possible to obtain the maximum sensitivity with a lower-power source due to compensation for cavity losses. Comparison with the sensitivity of the conventional nonresonant fiber ring interferometer (NFRI) is done.Fiber optical gyroscopes are based on the Sagnac effect which consists in the fact that the phase difference ϕ s of counterpropagating waves in a ring is related to the angular velocity Ω s of the ring aswhere S = πR 2 is the area enclosed by the ring, R is the ring radius, L = 2πRN is the fiber length, N is the number of turns, and λ and c are the wavelength and the speed of light, respectively. To date, physical studies in the field of the conventional fiber gyroscopy based on the Sagnac effect in single-pass fiber ring interferometers (FRIs) are completed in general. However, the problem of increasing sensitivity in optical gyroscopy remains topical. Solution of this problem with the use of resonant fiber ring interferometers (RFRIs), whose amplitude and phase characteristics are fairly sensitive to the appearance of the Sagnac phase difference in the case of a high Q-factor [1-8], encountered a number of difficulties. These difficulties were related to the use of laser radiation sources and the necessity of tuning the laser oscillation frequency to the resonant frequency of a fiber cavity as well as the influence of coherent scattered signals on the measured phase difference, etc. Hence, the study of RFRIs was not as active as the study of the conventional single-pass gyroscopes. The idea of using wideband (femtocorrelated) sources for RFRIs [9,10], which began to be employed much earlier in the conventional FRIs to decrease the backscattering effects, gave a hope for implementation of the potential of the resonance schemes with a considerably higher sensitivity to rotation than in the conventional FRIs. To date, a number of papers studying various RFRI schemes with wideband radiation sources and intracavity amplifiers appeared in the literature [11][12][13][14][15]. However, the problem of increasing sensitivity to rotation in fiber gyroscopy owing to the use of different RFRI schemes, including the use of fiber amplifiers, is far from completion at present, both experimentally and theoretically. The objective of this paper is to study the possibilities of increasing the signal sensitivity at the output of a resonant fiber interferometer with an external reflector and modulator (Fig. 1a) to rotation when using an active-fiber intracavity amplifier as well as to optimize the scheme parameters with allowance for source

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Backward influence of the interference signal from the sensors of physical quantities on the radiation intensity spectrum of a low-coherent source

Andronova

Gelikonov

2012

Radiophys Quantum El

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Features of a fiber ring interferometer

Cited by 4 publications

References 5 publications

Double-polarization fiber ring interferometer based on a single-mode isotropic fiber for gyroscopy

Double-polarization fiber ring interferometer based on a single-mode isotropic fiber for gyroscopy

Influence of a Regenerative Amplifier on the Sensitivity of a Resonant Fiber Ring Interferometer to Rotation

Backward influence of the interference signal from the sensors of physical quantities on the radiation intensity spectrum of a low-coherent source

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