کوچک سازی و افزایش پهنای باند تفکیک کننده قطبش ماخ – زندر با استفاده از تزویج گر چندمد غیریکنواخت

The design of a compact wideband polarization splitter based on Mach-Zehnder interferometer (MZI) with non-uniform multi-mode interferometer (MMI) couplers is presented in this manuscript. The polarization splitting in the proposed structure stems from polarization dependent dispersion of non-uniform silicon-on-insulator (SOI) waveguides used as the MZI arms. The use of non-uniform MMI couplers increases the bandwidth of the structure while reduces its sensitivity to fabrication imperfections. Our simulation results show the very low insertion loss of ۰.۸dB, and high polarization extinction ratios of ۱۰dB and ۱۵dB for transverse magnetic and transverse electric field polarization, respectively, in the ultra-wide bandwidth of ۱۰۰nm (۱۵۰۰nm-۱۶۰۰nm). The proposed polarization splitter has wider bandwidth and larger fabrication tolerance compared to the directional coupler based splitter. In addition total footprint is ۳.۸۶×۶۰mm۲ which is much smaller than MZI based splitters.

Keywords:

Polarization beam splitter , Mach-Zehnder Interferometer (MZI) , Silicon-On-insulator (SOI) , Polarization Extinction ratio (PER)