Numerical analysis of the harmonic components of the Bragg wavelength content in spectral responses of apodized fiber Bragg gratings written by means of a phase mask with a variable phase step height

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Tomasz Osuch

Abstract

The influence of the complex interference patterns created by a phase mask with variable diffraction efficiency in apodized fiber Bragg grating (FBGs) formation on their reflectance spectra is studied. The effect of the significant contributions of the zeroth and higher (m>±1) diffraction orders on the Bragg wavelength peak and its harmonic components is analyzed numerically. The results obtained for Gaussian and tanh apodization profiles are compared with similar data calculated for a uniform grating. It is demonstrated that when an apodized FBG is written using a phase mask with variable diffraction efficiency, significant enhancement of the harmonic components and a reduction of the Bragg wavelength peak in the grating spectral response are observed. This is particularly noticeable for the Gaussian apodization profile due to the substantial contributions of phase mask sections with relatively small phase steps in the FBG formation.

References

Jun 5, 2003·Optics Letters·Nicoleta M DragomirAnn Roberts
Nov 12, 2009·Applied Optics·Francisco Jose Torcal-MillaFrancisco Javier Salgado-Remacha
Jul 4, 2012·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Claire M RollinsonStephen F Collins
Dec 4, 2012·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Scott A WadeStephen F Collins
Oct 10, 2013·Optics Express·Chao Wang, Jianping Yao
Nov 18, 2014·Optics Express·Dmitrii Yu Stepanov, Leonardo Corena

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