Dr. Xinyu Cao Profile

Dr. Xinyu Cao

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Proceedings Article | 18 March 2024 Paper

Correction for phase-generated carrier algorithm demodulation errors caused by uneven frequency response

Lanxin Zhu, Huimin Huang, Xinyu Cao, Zhengbin Li

Proceedings Volume 13104, 131042G (2024) https://doi.org/10.1117/12.3023093

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The phase-generated carrier (PGC) algorithm is one of the most commonly employed demodulation schemes in optical fiber sensors. It exhibits high sensitivity in detecting weak signal and is less susceptible to fluctuations in light source intensity. However, the inevitable uneven frequency response of photoelectric detection will lead to distortion in the harmonic amplitudes, subsequently resulting in demodulation errors in the PGC scheme. This significantly jeopardizes the precision and accuracy of optical fiber sensors. This paper analyzes the demodulation errors in the PGC algorithm caused by non-uniform frequency response and proposes a correction method. In this method, only a correction factor is introduced in the final step of the PGC algorithm, without introducing additional complex computations. In comparison to conventional correction algorithms such as linear regression, function fitting, and neural networks, this method is simple, effective, and resource-friendly for DSP systems with limited resources. Experimental validation of this method is conducted using a fiber optic gyroscope prototype. The results demonstrate a remarkable reduction of 33-fold in demodulation error within the measurement range of -6 to +6 radian, reducing it from 610 parts per million (ppm) to a mere 18.3 ppm.

Proceedings Article | 18 March 2024 Paper

Sensitivity-enhanced fiber optic gyroscope for rotational seismology

Wenbo Wang, Lanxin Zhu, Yan He, Yanjun Chen, Huimin Huang, Xinyu Cao, Fangshuo Shi, Zhengbin Li

Proceedings Volume 13104, 1310433 (2024) https://doi.org/10.1117/12.3023330

KEYWORDS: Relative intensity noise, Modulation, Signal detection, Light sources, Fiber optic gyroscopes, Sensors, Polarized light, Quantum shot noise

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The measurement of rotational components in seismic waves holds significant importance in various fields, including seismic early warning, subsurface structure inversion, and the study of Earth's internal dynamic processes. The interferometric fiber optic gyroscope (IFOG) is a kind of sensor that measures the rotational velocity of an object based on the Sagnac effect. In this study, a synchronous four-state modulation scheme based on a light source sharing configuration is employed to suppress RIN. Moreover, this work extensively investigates the impact of shot noise and Johnson-Nyquist noise. By adjusting the modulation depths of the two minimum configurations, the influence of shot noise and Johnson-Nyquist noise is well-handled while achieving RIN suppression. Furthermore, this scheme avoids introducing any external feedback, thereby preventing a decrease in sensitivity caused by the dead zone issue. In a test on detecting the rotation rate of the Earth, a self-noise level of 55 nrad/s/Hz^1/2 and an angular random walk of 1.5 × 10⁻⁴ deg/h^1/2 are achieved with an enclosed area of only 25.5 m². Compared to the minimum configuration using the conventional phase generated carrier algorithm, the scheme realizes a 20-fold reduction in self-noise and an 18- fold reduction in angular random walk.

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