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Because of their complexity (>100 layers) and their decreasing dimensions (~pixel size), performances of the new generation of optical filters for space application are degraded by wide angle light scattering. For these reasons, it is huge important to be able to predict and measure the angular and specral behaviour of light scattered by complex interferential filters. In this paper, light scattering is calculated for complex filters and take simultaneously account of most parameters: surface roughness, bulk inhomogeneity, cross-correlation coefficients, errors in design, wavelength and scattering angles (normal and polar), polarization… All these variations have become necessary to predict a balance in optical multiplexers and related systems, mainly for space applications. To complete the analysis, a metrological platform dedicated to the multimodal characterization of scattering losses has been involved.
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