Coarse wavelength division (de)multiplexer using an interleaved angled multimode interferometer structure

Hu, Y., Gardes, F.Y., Thomson, D.J., Mashanovich, G.Z. and Reed, G.T. (2013) Coarse wavelength division (de)multiplexer using an interleaved angled multimode interferometer structure. Applied Physics Letters, 102 (25), [251116]. (doi:10.1063/1.4812746).

Record type: Article

Abstract

We have demonstrated a coarse wavelength (de)multiplexing structure on the silicon-on-insulator platform. It comprises two 4-channel angled multimode interferometers interleaved with an imbalanced Mach-Zehnder interferometer (MZI) leading to an 8-channel multiplexing device. The device requires only single lithography and etching steps for fabrication and has a good tolerance to fabrication errors in terms of waveguide width. The insertion loss and crosstalk achieved are 3-4 dB and -(15-20) dB, respectively. Potential is shown for achieving improved performance using larger waveguide bending radii in the MZI arms and/or (a) local heater(s) for refractive index tuning.

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