Abstract
In this paper, an analytical method is proposed for calculating reflection-spectrum
envelopes (RSEs) of various multipeak gratings. Consequently, impacts of parameters
on the envelope of the sampled grating are analyzed in detail both with and
without refractive index variation. Accuracy of those proposed methods has
been verified by the good agreement with the simulated reflectivity spectrum
of the transfer matrix method. A technology of multiple reflection spectrum
envelopes concatenation (MRSEC) is proposed to design multipeak gratings with
broad flat-top spectrum envelopes: one is the digital concatenated grating;
the other is the consecutive interleaved sampled grating. The proposed technology
can densify spectral channels of sampled gratings with fixed reflectivity
peak space, as well as spatially physical corrugation of structure.
© 2008 IEEE
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