Accuracy analysis of symmetrical folding algorithm based on optical feedback self-mixing interferometry
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Corresponding author:
YU Yan-guang, yanguangyu@zzu.edu.cn
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Received Date:
2008-06-17
Accepted Date:
2008-07-03
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Abstract
The linewidth enhancement factor of a semiconductor laser with moderate and strong feedback was measured by means of folding algorithm based on the optical feedback self-mixing interferometry. The factors affecting the accuracy of the folding algorithm,including the factor of optical feedback level,nonlinear motion of the external target,sampling frequency and location of turning points,was analyzed by processing the simulated signals. It was shown that optical feedback level factor was the premise of accurate measurement of linewidth enhancement factor and the error caused by nonlinear motion of external target could be reduced by using middle interference fringes. The folding algorithm was improved,providing a helpful measure for signal processing.
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