Coherent backscattering noise in a photonic-bandgap fiber optic gyroscope

Digonnet, Michel J. F.; Lloyd, Seth W.; Fan, Shanhui

doi:10.1117/12.835495

Cited by 9 publications

(5 citation statements)

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“…This is because as the linewidth decreases, the coherence length increases and hence the number of scatterers in the fiber contributing coherently to the bias increases. 8 However, once the coherence length of the source exceeds the loop length, the trend changes depending on the propogation loss. For a typical polarization maintaining fiber with 2 dB/km loss, the bias error becomes independent of source bandwidth.…”

Section: Outputmentioning

confidence: 99%

Near shot-noise limited performance of an open loop laser-driven interferometric fiber optic gyroscope

2011

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We report for the first time experimental evidence of near shot-noise limited performance for an open loop interferometric fiber optic gyroscope interrogated with a narrowband laser instead of a broadband source. Using a highly coherent laser source (Δf = 2.2 kHz), the measured gyroscope noise is 350 nrad/√Hz for an average returning power of 20 μW, while the measured noise for the same gyro operated with a broadband source (Δλ ≈ 30 nm) was 850 nrad/√Hz. This measured noise is only ~2 dB above the calculated shot noise for this power. This result was made possible by using a very narrow linewidth, which greatly reduces the laser phase noise and thus the phase-noise-mitigated coherent backscattering. This excellent noise performance has applications for future fiber gyroscope technologies as well as other sensors utilizing a Sagnac interferometer. The bias drift of the laser-driven gyroscope was higher than anticipated but could be reduced to roughly Earth-rate using a frequency sweeping technique. In addition to improved sensitivity, the benefits of using a laser include much higher scale factor stability, lower power consumption, and lower component cost.

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Section: Outputmentioning

confidence: 99%

Near shot-noise limited performance of an open loop laser-driven interferometric fiber optic gyroscope

2011

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“…Navigational grade performance is feasible. Interesting developments include using hollow-core fibre to avoid scattering entirely [23], and a revisiting of the use of high coherence sources whilst maintaining good overall performance [24].…”

Section: Gyroscopesmentioning

confidence: 99%

30 Years of the OFS Conference: the origins and directions of our subject

Jones¹

2014

SPIE Proceedings

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“…For the R-FOG, the recent advent of air-core photonic-bandgap fibers (PBFs) offers a radically new means for further reducing all of the above performance degradation simultaneously [16][17][18], as in a PBF the optical mode is mostly confined to the air core, whereas in a conventional fiber, the lightwave travels entirely through silica. Thus, by replacing the solid-core fiber with the PBF in the R-FOG, the R-FOG is still a promising candidate for high grade rotation sensing.…”

Section: Introductionmentioning

confidence: 99%

Closed loop resonator fiber optic gyro with precisely controlled bipolar digital serrodyne modulation

Wang

Kishi

et al. 2012

SPIE Proceedings

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A closed-loop resonator fiber optic gyro (R-FOG) with a precisely controlled bipolar digital serrodyne phase modulation scheme is experimentally demonstrated. The serrodyne modulation scheme serves multiple functions in the R-FOG, from reducing the backscattering induced performance degradation to achieving the closed-loop operation. To improve the backscattering suppression efficiency, a precise amplitude adjustment method using a gain variable amplifier and the oversampling technique is utilized to control the waveform of the bipolar digital serrodyne phase modulation. Compared with the amplitude control via adjusting the digital gain of the function generator, improved bias stability is realized. Moreover, the closed-loop operation is needed for the R-FOG to achieve high linearity in a wide dynamic range as the frequencies of both the clockwise (CW) and the counter clockwise (CCW) lightwaves are maintained at the resonator's resonant frequency. To balance the resonant frequency difference, an additional bipolar digital serrodyne waveform, with the slope proportional to the rotation speed to compensate for the resonant frequency difference, is superimposed on the original bipolar digital serrodyne waveform. Measurement results of different rotation speeds show good linearity thanks to the adoption of closed-loop operation.

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Coherent backscattering noise in a photonic-bandgap fiber optic gyroscope

Cited by 9 publications

References 0 publications

Near shot-noise limited performance of an open loop laser-driven interferometric fiber optic gyroscope

Near shot-noise limited performance of an open loop laser-driven interferometric fiber optic gyroscope

30 Years of the OFS Conference: the origins and directions of our subject

Closed loop resonator fiber optic gyro with precisely controlled bipolar digital serrodyne modulation

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