Low noise and low drift in a laser-driven fiber optic gyroscope with a 1-km coil

Chamoun, Jacob; Mosca, F. A.; Digonnet, Michel J. F.

doi:10.1117/12.2059692

Cited by 4 publications

(8 citation statements)

References 5 publications

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“…4 broadly agree with the drift trend predicted by the present combined polarizationcoupling and backscattering models, namely that (1) [27]. The resonant micro-optical gyroscope (RMOG), while potentially more compact and inexpensive to produce, has a significantly higher noise (156 o /h/√Hz was reported in [1]).…”

Section: Resultssupporting

confidence: 85%

Noise and Bias Error Due to Polarization Coupling in a Fiber Optic Gyroscope

Chamoun

Digonnet

2015

J. Lightwave Technol.

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This paper reports a comprehensive model of the noise and drift induced by polarization coupling in a fiber optic gyroscope (FOG) interrogated with a laser of arbitrary linewidth. It includes the effects of dynamic phase biasing, a realistic description of laser phase noise, and polarization-dependent loss. This model yields concise analytical expressions for the noise and drift dependencies on the laser linewidth, the fiber length and holding parameter h, and the fractional power launched into the unwanted polarization at the input to the sensing coil. For all realistic FOG parameter sets the polarization-coupling noise is found to be insignificant. For a 1-km coil, a typical holding parameter (h = 10 -5 ), and push-pull modulation, the drift is only ~1 µrad up to a linewidth of ~100 MHz, which is far lower than previously believed. The drift decreases to even lower values for larger linewidths. Experimental measurements of the noise and drift in a 150-m FOG and their dependence on laser linewidth support these predictions. Birefringence modulation can be brought to bear to reduce this residual drift enough to meet the requirement for aircraft inertial navigation. Ultimately, this analysis shows that low polarization coupling error can be obtained without the use of a broadband source.Index Terms-Fiber optic gyroscope, laser phase noise, optical polarization, polarization nonreciprocity error, Sagnac interferometer 0733-8724 (c)

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Section: Resultssupporting

confidence: 85%

Noise and Bias Error Due to Polarization Coupling in a Fiber Optic Gyroscope

Chamoun

Digonnet

2015

J. Lightwave Technol.

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“…At this point we should stress, however, that the presented technology is not yet competitive with a classical FOG. Laser-driven FOG [20] use an optical power of approx. m 20 W, which corresponds to a rate of 156×10 12 photons per second (at l = 1550 nm).…”

Section: Resultsmentioning

confidence: 99%

“…With experiments and applications becoming increasingly demanding-so does the severity of the limitation imposed by noise. Moreover, since power circulating in the interferometer cannot be increased arbitrarily, due to detrimental power-dependent effects such as to coherent back-scattering [20] or nonlinear Kerr effects [21], methods and techniques from quantum metrology will play a significant role in reaching the ultimate sensitivity limits of FOG and enable evermore demanding applications in fundamental science and technology. With the speed of ongoing developments in advancing detector technology and increasingly brighter photon sources, a technical application of such a system may become feasible in the foreseeable future.…”

Section: Resultsmentioning

confidence: 99%

“…the standard deviation) around the average number of detected photons M. Therefore, the shot-noise limit (SNL) f f D = <D M 1 constitutes a fundamental boundary for the phase resolution achievable wit coherent or thermal states. While the phase resolution can obviously be enhanced by increasing the average photon rate, arbitrarily accurate measurements are prevented by additional phase noise resulting from detrimental effects like nonlinear Kerr effects or coherent back-scattering induced at high power levels [20,21]. Consequently, a trade-off between these additional noise sources and the SNL has to be made to find the optimal operating point in any practical FOG.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Entanglement-enhanced optical gyroscope

et al. 2019

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Fiber optic gyroscopes (FOG) based on the Sagnac effect are a valuable tool in sensing and navigation and enable accurate measurements in applications ranging from spacecraft and aircraft to self-driving vehicles such as autonomous cars. As with any classical optical sensors, the ultimate performance of these devices is bounded by the shot-noise limit (SNL). Quantum-enhanced interferometry allows us to overcome this limit using non-classical states of light. Here, we report on an entangled-photon gyroscope that uses path-entangled NOON-states (N=2) to provide super-resolution and phase sensitivity beyond the shot-noise limit.

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“…1. [32], the U. Wash. balance beam [23], the Caltech balance beam [24], the G-Ring laser gyro [33,34], the Laser FOG [35], the G-Pisa laser gyro [36], the Stanford atom interferometer [29], and the UCBerkeley superfluid He sensor [30]. A pickoff of the beam is upshifted macroscopically by 100 MHz-roughly the FSR of the cavity-and feedback is applied to the AOM to lock this upshifted beam to the clockwise mode of the cavity.…”

Section: Rotation Sensingmentioning

confidence: 99%

Passive, free-space heterodyne laser gyroscope

Korth¹,

Heptonstall²,

Hall³

et al. 2016

Class. Quantum Grav.

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Abstract. Laser gyroscopes making use of the Sagnac effect have been used as highly accurate rotation sensors for many years. First used in aerospace and defense applications, these devices have more recently been used for precision seismology and in other research settings. In particular, mid-sized (∼ 1 m-scale) laser gyros have been under development as tilt sensors to augment the adaptive active seismic isolation systems in terrestrial interferometric gravitational wave detectors. The most prevalent design is the "active" gyroscope, in which the optical ring cavity used to measure the Sagnac degeneracy breaking is itself a laser resonator. In this article, we describe another topology: a "passive" gyroscope, in which the sensing cavity is not itself a laser but is instead tracked using external laser beams. While subject to its own limitations, this design is free from the deleterious lock-in effects observed in active systems, and has the advantage that it can be constructed using commercially available components. We demonstrate that our device achieves comparable sensitivity to those of similarly sized active laser gyroscopes.

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Low noise and low drift in a laser-driven fiber optic gyroscope with a 1-km coil

Cited by 4 publications

References 5 publications

Noise and Bias Error Due to Polarization Coupling in a Fiber Optic Gyroscope

Noise and Bias Error Due to Polarization Coupling in a Fiber Optic Gyroscope

Entanglement-enhanced optical gyroscope

Passive, free-space heterodyne laser gyroscope

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