Abstract

In this paper, a compact and broadband mode converter and demultiplexer based on multimode interference (MMI) is designed and experimentally demonstrated on silicon-on-insulator. We have designed a mode converter using cascaded MMI to convert the fundamental mode into a higher-order (first-order mode) and vice versa. Subsequently, we have demonstrated an on-chip two-mode demultiplexer with a compact footprint and low loss. The proposed mode demultiplexer shows low insertion loss (0.22 dB for ${\mathrm{T}\mathrm{E}}_0$ and 0.36 dB for ${\mathrm{T}\mathrm{E}}_1$ mode) and crosstalk ($-25.2\mathrm{d}\mathrm{B}$ for ${\mathrm{T}\mathrm{E}}_0$ and $-24.4\mathrm{d}\mathrm{B}$ for ${\mathrm{T}\mathrm{E}}_1$ mode) at wavelength 1550 nm using the eigenmode expansion method. Moreover, the device supports a broad bandwidth having crosstalk $<-20\mathrm{d}\mathrm{B}$ over a wavelength range of 1520–1580 nm. The proposed device can be used in mode division multiplexing for photonic network-on-chip.

© 2020 Optical Society of America

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