Abstract

A three-dimensional polymer mode (de)multiplexer based on mode evolution is proposed. The proposed configuration is mainly composed of cascaded two tapered couplers where waveguides with different heights are inversely tapered to achieve mode conversions of the ${{\rm E}_{11}},\;{{\rm E}_{21}}$, and ${{\rm E}_{31}}$ modes. The dimensional parameters and characteristics are analyzed by the beam propagation method. This mode (de)multiplexer exhibits the coupling ratio greater than 0.97, excess loss lower than 0.15 dB and extinction ratio higher than 20 dB for TE and TM polarizations over the wavelength range ${1530}\sim{1625}\;{\rm nm}$ (the ${\rm C} + {\rm L}$ band). This design has weak wavelength dependence and polarization dependence, which is promising to be applied to broadband on-board mode multiplexing.

© 2021 Optical Society of America

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