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We demonstrate broadband (1500-1620 nm) and low-loss planar waveguide polarizers with measurement-limited on-chip extinction as high as 75 dB. Polarizers can be fabricated in higher confinement 100-nm-thick as well as lower confinement 40-nm-thick Si<sub>3</sub>N<sub>4</sub> cores to suit a variety of photonic systems.

Ultralow-Loss Planar $\hbox{Si}_{3}\hbox{N}_{4}$ Waveguide Polarizers