Fractional Fourier transform reflectometry

Lihi Shiloh; Avishay Eyal

doi:10.1117/12.2059621

2 June 2014 Fractional Fourier transform reflectometry

Lihi Shiloh, Avishay Eyal

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91576T (2014) https://doi.org/10.1117/12.2059621
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

In some OFDR implementations it is advantageous to use sinusoidal frequency tuning and to work in the linear range of the sinusoid. For a given scan frequency this limits the maximum length of the interrogated fiber. We propose a new method which allows exceedingly large delays while maintaining high scan rates. It is based on the observation that delay of half the scan period yields linearly frequency modulated (LFM) signals at the OFDR receiver. Using Fractional Fourier Transform (FrFT) for processing the raw data enables measurement of the z-dependent reflection at long ranges with high resolution and high scan rates.

Citation Download Citation

Lihi Shiloh and Avishay Eyal "Fractional Fourier transform reflectometry", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91576T (2 June 2014); https://doi.org/10.1117/12.2059621

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