Superimposed fiber Bragg gratings are very attractive as multiwavelength filters for many applications. Particularly, their spectral parameters can be specially tailored to have different passband and linewidth characteristics as a coding-decoding element for optical code-division multiple-access systems. In this letter, we perform a simulation of such structures by implementation of an advanced method of single expression, which accurately describes the wave propagation problem in the stratified media by numerical solution of the wave equation.
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Meghavoryan et al. (2003) studied this question.
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