Abstract

An ultra-compact polarization splitter–rotator with a discretized subwavelength nanostructure is demonstrated on the silicon-on-insulator platform. The device has a length of only 7.92 μm. For ${\mathrm{TE}}_0–{\mathrm{TE}}_0$, a low insertion loss ($<0.2\mathrm{dB}$), low crosstalk ($<-20\mathrm{dB}$), and high extinction ratio ($>40\mathrm{dB}$) are achieved over a broad wavelength range from 1500 nm to 1600 nm. For ${\mathrm{TM}}_0–{\mathrm{TE}}_0$, the insertion loss is lower than 1 dB over 40 nm bandwidth (1530–1570 nm). The crosstalk is lower than $-25\mathrm{dB}$, and the extinction ratio is larger than 20 dB, from 1500 nm to 1600 nm.

© 2019 Optical Society of America

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