Answers are grounded in this paper and cite their sources.
A deeper insight into the relationship between the shape of a slowly varying nonuniform Bragg grating and its reflectance spectrum is obtained through a qualitative graphical analysis of the local photonic band gaps in the grating and a quantitative WKB (or phase-integral) approximation of the grating fields. Three different gratings---a linearly chirped grating, a moir\'e grating, and a Gaussian tapered grating---are analyzed in detail to illustrate the power of the technique. The results are in excellent agreement with the exact numerical results obtained via coupled-mode analysis.
No takes yet. Share an insight, caveat, or question.
L. Poladian (1993) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: