Waveform distortion and Doppler frequency broadening of self-mixing signal in polymer fiber optic VCSEL system

Huaqiao Gui; Wei Huang; Jing Xu; Liang Lv; Jianping Xie

doi:10.1117/12.760180

8 January 2008 Waveform distortion and Doppler frequency broadening of self-mixing signal in polymer fiber optic VCSEL system

Huaqiao Gui, Wei Huang, Jing Xu, Liang Lv, Jianping Xie

Author Affiliations +

Proceedings Volume 6838, Optoelectronic Devices and Integration II; 683829 (2008) https://doi.org/10.1117/12.760180
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

The influences of polymer optical fiber (POF) on self-mixing signals in laser Doppler velocimetry are investigated in detail. The waveform distortion and Doppler frequency broadening of self-mixing signal have been observed for the first time. It indicates theoretically and experimentally that the large acceptance angle of POF facet is the major reason for this phenomenon. The other characteristics of POF, such as bend radius over 7.5mm and thermal effect at room temperature, don't cause significant signal distortion. Lastly, we demonstrated a compact fiber-optic self-mixing laser Doppler vibrometer with high accuracy of half optical wavelength and long working distance between fiber facet and diffusing target adopting a single-longitudinal mode vertical-cavity surface-emitting laser (VCSEL).

Citation Download Citation

Huaqiao Gui, Wei Huang, Jing Xu, Liang Lv, and Jianping Xie "Waveform distortion and Doppler frequency broadening of self-mixing signal in polymer fiber optic VCSEL system", Proc. SPIE 6838, Optoelectronic Devices and Integration II, 683829 (8 January 2008); https://doi.org/10.1117/12.760180

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