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Liquid-crystal on Silicon (LCoS) microdisplays are one of the competing technologies to implement wavelength selective switches (WSS) for optical telecommunications. Last generation LCoS, with more than 4 megapixels, have decreased pixel size to values smaller than 4 microns, what increases interpixel cross-talk effects such as fringing-field. We proceed with an experimental evaluation of a 3.74 micron pixel size parallel-aligned LCoS (PA-LCoS) device. At 1550 nm, for the first time we use time-average Stokes polarimetry to measure the retardance and its flicker magnitude as a function of voltage. We also verify the effect of the antireflection coating when we try to characterize the PA-LCoS out of the designed interval for the AR coating. Some preliminary results for the performance for binary gratings are also given, where the decrease of modulation range with the increase in spatial frequency is shown, together with some residual polarization effects.Work supported by Ministerio de Economía, Industria y Competitividad (Spain) (FIS2014-56100-C2-1-P and FIS2015- 66570-P) and by Generalitat Valenciana (Spain) (PROMETEO II/2015/015). This work has been supported by the EC through H2020 project ROAM (Grant no: 645361 www.roam-project.eu )

Polarimetric and diffractive evaluation of 3.74 micron pixel-size LCoS in the telecommunications C-band