Binary blazed grating-based polarization-independent filter on silicon on insulator

In this paper, a binary blazed grating-based polarization independent filter on silicon on insulator(SOI)under full conical incidence is presented. The properties of the grating filter are investigated by rigorous coupled-wave analysis. It's shown that the filter demonstrates high reflectivity(R > 99%) at its resonant wavelength, which stays the same under three different polarization states. It indicates that this grating filter is polarization-independent.The final data shows its polarization-dependent loss(PDL)is only 0.04 dB and the full width at half maximums(FWHMs) of the transverse electric(TE-) and transverse magnetic(TM-) polarized light are 0.24 and 0.46 nm,respectively.