Polarisation dependent loss calculation in echelle gratings using finite element method and Rayleigh expansion

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Journal Article
Optical and Quantum Electronics, 2004, 36 (1-3), pp. 223 - 238
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We describe a numerical method to compute the reflectivity of a metallised integrated echelle grating. The modelling is based on a combination of a finite element method in the region inside the grating teeth and the Rayleigh field expansion outside. Results show a net dependence of the efficiency on the polarisation state (directly related to PDL), as a function of the wavelength, due to two factors: a lower reflectivity for the TM light in the operating order and a shift in the maximum of the response curve.
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