Research and measurement of feedback strength of optical feedback self-mixing interferometry systems

ZHU Hong-wei; YE Hui-ying

doi:10.3969/j.issn.1001-3806.2010.06.034

In order to obtain feedback strength of optical feedback self-mixing interferometry (OFSMI) systems exactly, OFSMI signals were simulated and analyzed and Lang-Kobayashi equations were solved.It is found that separation between the minimum of the up-side interferometric fringes and the maximum of down-side interferometric fringes grows as the optical feedback strength factor increases.Some interferometric fringes disappear when the factor is greater than 7.8.Besides,a formula about feedback strength factor was deduced from hysteresis phenomenon and a measurement model was set up.The simulation and experimental results show that OFSMI signal fringes are related to the optical feedback strength factor.The proposed model based on the formula about the factor can be used to judge regimes of OFSMI measurement systems and the value of optical feedback strength factor can be figured out when it is between 1 and 7.8.

Research and measurement of feedback strength of optical feedback self-mixing interferometry systems

Corresponding author: YE Hui-ying, iehyye@zzu.edu.cn

1. College of Information Engineering, Zhengzhou University, Zhengzhou 450001, China

Received Date: 2009-12-17

Accepted Date: 2010-04-02

Available Online: 2010-11-25

Abstract: In order to obtain feedback strength of optical feedback self-mixing interferometry (OFSMI) systems exactly, OFSMI signals were simulated and analyzed and Lang-Kobayashi equations were solved.It is found that separation between the minimum of the up-side interferometric fringes and the maximum of down-side interferometric fringes grows as the optical feedback strength factor increases.Some interferometric fringes disappear when the factor is greater than 7.8.Besides,a formula about feedback strength factor was deduced from hysteresis phenomenon and a measurement model was set up.The simulation and experimental results show that OFSMI signal fringes are related to the optical feedback strength factor.The proposed model based on the formula about the factor can be used to judge regimes of OFSMI measurement systems and the value of optical feedback strength factor can be figured out when it is between 1 and 7.8.

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Reference (9)

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Research and measurement of feedback strength of optical feedback self-mixing interferometry systems

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