Characterization of the dispersion of chirped fiber Bragg grating through Fourier transform spectrometry method

Qingshan Chen; Naiguang Lu; Feng Jiang

doi:10.1117/12.755295

4 January 2008 Characterization of the dispersion of chirped fiber Bragg grating through Fourier transform spectrometry method

Qingshan Chen, Naiguang Lu, Feng Jiang

Author Affiliations +

Proceedings Volume 6837, Information Optics and Photonics Technologies II; 68370W (2008) https://doi.org/10.1117/12.755295
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

Introduces a Fourier transform spectrometric method for the precise characterization of dispersion of chirped FBGs(fiber Bragg grating). The measurement system is a fiber Michelson interferometer composed of a broadband EDFA (Erium doped fiber amplifier) light source, a 3db 2×2 fiber coupler, a pair of polarization controllers, a optical attenuator, a fiber filter, an O/E converter, A/D converter, computer and a optical path difference (OPD) scanning system. The digital interferogram of the system is acquired by recording the electric signal produced by the O/E converter through the A/D converter and by computer during the scanning of OPD. The recorded interferogram is then manipulated through a process involving low-pass filtering, fast Fourier transformation, phase unwrapping and computation of the numerical differentials of the unwrapped phase to the wavelength so as to obtain the relative group delay of the chirped FBG under test. It is proved by practical experiments that the repeatability of the system is up to Ps(picosecond) magnitude order.

Citation Download Citation

Qingshan Chen, Naiguang Lu, and Feng Jiang "Characterization of the dispersion of chirped fiber Bragg grating through Fourier transform spectrometry method", Proc. SPIE 6837, Information Optics and Photonics Technologies II, 68370W (4 January 2008); https://doi.org/10.1117/12.755295

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