Experimental investigation of sensitivity improvement of chaotic fiber ring laser sensing system with embedded Sagnac interferometer

Nian Fang; Haijuan Qin; Lutang Wang; Zhaoming Huang

doi:10.1117/12.2069502

21 August 2014 Experimental investigation of sensitivity improvement of chaotic fiber ring laser sensing system with embedded Sagnac interferometer

Nian Fang, Haijuan Qin, Lutang Wang, Zhaoming Huang

Author Affiliations +

Proceedings Volume 9233, International Symposium on Photonics and Optoelectronics 2014; 92330M (2014) https://doi.org/10.1117/12.2069502
Event: International Symposium on Photonics and Optoelectronics (SOPO 2014), 2014, Suzhou, China

Abstract

The sensitivity of optical fiber ring laser distributed sensing system based on the mechanism of chaotic system’s sensitivity to initial conditions is low. Fiber interferometer distributed sensing system’s sensitivity is high. In this paper, a distributed sensing system with the structure of chaotic fiber ring laser (CFRL) embedding a Sagnac loop interferometer is proposed by combining the property of zero order interference of chaotic light and reciprocity of Sagnac interferometer. It can be used to improve the sensitivity of CFRL sensing system. According to the changes of temporal waveforms, frequency spectrums and autocorrelation functions out of the systems under the same disturbance, the sensitivities are compared between the improved system and the original CFRL system. Experimental results show that the sensitivity of the proposed system is higher than that of the CFRL system. In addition, the response properties of the system under the same amplitude and different frequencies of disturbance signals are measured. The results show that the system can detect the disturbances in the frequency range from 10 kHz to 300 kHz and the responses are flat. The detection abilities to weak signals with different amplitudes are compared. With the rising of disturbance signals amplitudes under the same frequency, the autocorrelation amplitudes of the interference signals increase. In conclusion, the proposed system improves the sensitive to weak disturbance signals with different amplitudes and frequencies. The frequency and amplitude of the disturbance signals can be obtained by the frequency spectrum and autocorrelation function of the waveform of the system.

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Nian Fang, Haijuan Qin, Lutang Wang, and Zhaoming Huang "Experimental investigation of sensitivity improvement of chaotic fiber ring laser sensing system with embedded Sagnac interferometer", Proc. SPIE 9233, International Symposium on Photonics and Optoelectronics 2014, 92330M (21 August 2014); https://doi.org/10.1117/12.2069502

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KEYWORDS

Fiber lasers

Sensing systems

Ferroelectric materials

Interferometers

Sagnac interferometers

Chaos

Signal detection

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