Abstract
In this paper, a theoretical and numerical analysis of novel in-fiber
photonic devices based on a structured chirped fiber Bragg gratings (CFBGs)
for sensing and communication applications is presented. The investigated
structure consists in a CFBG with single or multiple defects obtained by a
deep and localized stripping of the cladding layer along the grating structure.
The thinning of the cladding layer, partial or total, changes the core propagation
features and thus leads to a significant modification of the grating spectral
features. The effect of the local thinning, properly exploited, basically
consists in the formation of one or more passbands within the original grating
bandwidth and in one or more stopbands out of the original grating bandwidth.
In addition, due to spatial encoding of the Bragg wavelength in CFBGs, the
spectral position of each channel exclusively depends on the features of its
own defect in a well defined location along the grating. Thus, the spectral
properties of each channel are not affected by additional defects located
elsewhere along the grating structure, enabling the possibility to develop
independent multichannel devices by exploiting a single grating element. The
spectral behavior exhibited by the microstructured device has been here numerically
analyzed in dependence on the thinned region parameters. In addition a simple
theoretical model has been extracted in order to easily design the device
according to the desired spectral features for specific applications.
© 2008 IEEE
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