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Improving the performance in an optical feedback self-mixing interferometry system using digital signal pre-processing

Conference Paper


Abstract


  • This paper considers the issue of noise reduction associated with Optical Feedback Self-mixing Interferometries (OFSMI). The objective is to develop an effective pre-processing filtering solution that can eliminated the inherent noise disturbances. The characteristics of OFSMI signals are described in some detail and two filter solutions are proposed. The latter includes a non-linear median filter and a Kaiser based FIR filter. The performance of the two types of filters are investigated. It is shown that median filters are capable of removing sparkle-like noise while Kaiser based FIR filters are effective in reducing the high frequency noise as well as the slow time-varying signal envelop fluctuation. Interestingly our results show that the best performance is achieved by combining the two filters, that is, a median filter followed by a Kaiser-based FIR filter. In other words, the estimation accuracy of OFSMI parameters such as the line-width enhancement factor (LEF) of semiconductor lasers is significantly improved with the aid of the proposed pre-processing solution. ©2007 IEEE.

Publication Date


  • 2007

Citation


  • Yu, Y., Xi, J., & Chicharo, J. F. (2007). Improving the performance in an optical feedback self-mixing interferometry system using digital signal pre-processing. In 2007 IEEE International Symposium on Intelligent Signal Processing, WISP. doi:10.1109/WISP.2007.4447495

Scopus Eid


  • 2-s2.0-51149105222

Web Of Science Accession Number


Abstract


  • This paper considers the issue of noise reduction associated with Optical Feedback Self-mixing Interferometries (OFSMI). The objective is to develop an effective pre-processing filtering solution that can eliminated the inherent noise disturbances. The characteristics of OFSMI signals are described in some detail and two filter solutions are proposed. The latter includes a non-linear median filter and a Kaiser based FIR filter. The performance of the two types of filters are investigated. It is shown that median filters are capable of removing sparkle-like noise while Kaiser based FIR filters are effective in reducing the high frequency noise as well as the slow time-varying signal envelop fluctuation. Interestingly our results show that the best performance is achieved by combining the two filters, that is, a median filter followed by a Kaiser-based FIR filter. In other words, the estimation accuracy of OFSMI parameters such as the line-width enhancement factor (LEF) of semiconductor lasers is significantly improved with the aid of the proposed pre-processing solution. ©2007 IEEE.

Publication Date


  • 2007

Citation


  • Yu, Y., Xi, J., & Chicharo, J. F. (2007). Improving the performance in an optical feedback self-mixing interferometry system using digital signal pre-processing. In 2007 IEEE International Symposium on Intelligent Signal Processing, WISP. doi:10.1109/WISP.2007.4447495

Scopus Eid


  • 2-s2.0-51149105222

Web Of Science Accession Number