Abstract

We propose a mode-conversion platform based on cascaded long-period waveguide gratings. We demonstrate two specific devices by cascading a surface-corrugated grating and a sidewall-corrugated grating. One device allows conversion among the ${\mathrm{LP}}_{01}$, ${\mathrm{LP}}_{11b}$, and ${\mathrm{LP}}_{11a}$ modes in a cyclic manner. The maximum conversion efficiency of a typical experimental device fabricated with polymer materials is about 94% at 1540 nm. The other device allows conversion between the ${\mathrm{LP}}_{01}$ and ${\mathrm{LP}}_{21a}$ modes. The maximum conversion efficiency of a typical experimental device is estimated to be higher than 90% at 1550 nm. The performance of both devices is polarization-insensitive. The proposed platform could be developed into various mode converters for mode-division-multiplexing systems and other mode-sensitive applications.

© 2016 Optical Society of America

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