Low-loss and Ultra-broadband Silicon Nitride Angled MMI Polarization Splitter

We experimentally demonstrate a SiN angled-MMI based polarization splitter with nearly wavelength-independent performance over C+L bands, insertion loss « 0.8 dB (1.0 dB), and crosstalk < —18 dB (< -20 dB) for TE (TM) polarization.