Noise investigation and signal processing in fiber optic gas sensor with wavelength modulation of the DFB laser diode

Jun Chang; Qingjie Huang; Xiangzhi Liu; Kun Chen; Hengtai Chang; Guangping Lv; Cunguang Zhu; Guoqing Zhou; Qiang Wang; Zhongliang Wang; Ting Gao; Chen Li

doi:10.1117/12.928890

15 October 2012 Noise investigation and signal processing in fiber optic gas sensor with wavelength modulation of the DFB laser diode

Jun Chang, Qingjie Huang, Xiangzhi Liu, Kun Chen, Hengtai Chang, Guangping Lv, Cunguang Zhu, Guoqing Zhou, Qiang Wang, Zhongliang Wang, Ting Gao, Chen Li

Author Affiliations +

Proceedings Volume 8497, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VI; 84970T (2012) https://doi.org/10.1117/12.928890
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

Noise from optical and electronic components of a fiber optic gas sensor system using wavelength modulation of the DFB laser diode in either transmission or reflection mode were investigated. Our experimental results indicate that reflective type cells give poorer performance due to interference effects from connectors and joints within the fiber system compare to transmissive type cell. Intensity noise from optical coupler, collimator, was measured and its affection to sensing system was discussed. In order to raise the signal to noise ratio (SNR), signal processing methods, such as data average, low pass filter were used and compared. The results would be a useful engineering tool to design high SNR optical gas sensing system.

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Jun Chang, Qingjie Huang, Xiangzhi Liu, Kun Chen, Hengtai Chang, Guangping Lv, Cunguang Zhu, Guoqing Zhou, Qiang Wang, Zhongliang Wang, Ting Gao, and Chen Li "Noise investigation and signal processing in fiber optic gas sensor with wavelength modulation of the DFB laser diode", Proc. SPIE 8497, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VI, 84970T (15 October 2012); https://doi.org/10.1117/12.928890

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