Broadband mode switch based on a three-dimensional waveguide Mach–Zehnder interferometer

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)4877-4880
Journal / PublicationOptics Letters
Issue number23
Online published22 Nov 2017
Publication statusPublished - 1 Dec 2017



We propose a mode switch that operates on modulating the optical phases of a three-dimensional balanced four-arm waveguide Mach–Zehnder interferometer. We design and fabricate the device with polymer material to achieve thermo-optic switching between any two of the E11, E21, E12, and E22 modes of the waveguide. Our experimental device shows an extinction ratio higher than 14 dB and a switching time shorter than 3.7 ms, measured with the E11 mode switched to any of the other modes at 1550 nm. This mode switch can operate over a wide range of wavelengths with weak polarization dependence and could be used in reconfigurable fiber-based mode-division-multiplexing systems where mode routing is required.

Research Area(s)

  • Integrated optics, Optical switching devices, Polymer waveguides, buffers, couplers, routers, switces, and multiplexers

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