Fiber Bragg grating dispersion measurement based on frequency domain processing

Feng Jiang; Qingshan Chen

doi:10.1117/12.828679

20 May 2009 Fiber Bragg grating dispersion measurement based on frequency domain processing

Feng Jiang, Qingshan Chen

Proceedings Volume 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 72831Q (2009) https://doi.org/10.1117/12.828679
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China

Abstract

A fiber Bragg grating (FBG) dispersion measurement method is presented. The measurement system is comprised of a fiber Michelson interferometer and a numerical sampling and processing system. The FBG under test is spliced into the test arm of the interferometer, and the reference arm contains an air path so that the total optical path difference of the interferometer can be varied and scanned. Low-coherence lights are reflected in two arms and combined at the fiber coupler where the interference occurs. According to Fourier spectrometric theory, the recorded interferogram's fringe visibility is proportional to the magnitude of the Fourier transform of the product of the light source spectrum and the complex field reflectance of FBG. The group delay of FBG is obtained by making fast Fourier transformation, unwrapping phase and numerically differentiating the unwrapped phase with respect to frequency. Experimental results show that the experimental repeatability is up to picosecond magnitude order.

Citation Download Citation

Feng Jiang and Qingshan Chen "Fiber Bragg grating dispersion measurement based on frequency domain processing", Proc. SPIE 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 72831Q (20 May 2009); https://doi.org/10.1117/12.828679

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