TY - JOUR AU - Kudalippalliyalil, Ramesh AU - Murphy, Thomas E. AU - Grutter, Karen E. TI - Low-loss and ultra-broadband silicon nitride angled MMI polarization splitter/combiner JO - Optics Express J2 - Opt. Express VL - 28 IS - 23 SP - 34111 PY - 2020 DO - 10.1364/OE.405188 AB - The property of self-imaging combined with the polarization birefringence of the angled multimode waveguide is used to design a silicon nitride (SiN) polarization splitter (PS) at λ ∼ 1550 nm. The demonstrated PS on a 450 nm thick SiN device layer (with 2.5 µm cladding oxide) has a footprint of 80 µm×13 µm and exhibits nearly wavelength independent performance over the C+L bands. Also, the device can be configured as a polarization combiner (PC) in reverse direction with similar bandwidth and performance. The measured crosstalk (CT) and insertion loss (IL) are respectively <−18 dB (<−20 dB) and ∼0.7 dB (∼0.8 dB) for TE (TM) polarization over the measurement wavelength range of 1525 nm ≤λ ≤ 1625 nm. The measured device parameter variations suggest some tolerance to fabrication variations. Such a device is a good candidate for a photonics integrated chip (PIC) foundry-compatible, SiN PS. UR - http://www.opticsexpress.org/abstract.cfm?URI=oe-28-23-34111 KW - Optical directional couplers Phase matching Polarization mode dispersion Polarization splitters Waveguide cores Wavelength division multiplexers LB - Kudalippalliyalil_OE_23_34111_2020 ER -