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Proceedings Paper

Noise investigation and signal processing in fiber optic gas sensor with wavelength modulation of the DFB laser diode
Author(s): Jun Chang; Qingjie Huang; Xiangzhi Liu; Kun Chen; Hengtai Chang; Guangping Lv; Cunguang Zhu; Guoqing Zhou; Qiang Wang; Zhongliang Wang; Ting Gao; Chen Li
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Paper 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.

Paper Details

Date Published: 15 October 2012
PDF: 6 pages
Proc. SPIE 8497, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VI, 84970T (15 October 2012); doi: 10.1117/12.928890
Show Author Affiliations
Jun Chang, Shandong Univ. (China)
Qingjie Huang, Shandong Univ. (China)
Xiangzhi Liu, Shandong Academy of Sciences (China)
Kun Chen, Shandong Univ. (China)
Hengtai Chang, Shandong Univ. (China)
Guangping Lv, Shandong Univ. (China)
Cunguang Zhu, Shandong Univ. (China)
Guoqing Zhou, Shandong Univ. (China)
Qiang Wang, Shandong Univ. (China)
Zhongliang Wang, Shandong Univ. (China)
Ting Gao, Shandong Univ. (China)
Chen Li, Shandong Univ. (China)


Published in SPIE Proceedings Vol. 8497:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VI
Shizhuo Yin; Ruyan Guo, Editor(s)

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