title: Silicon nitride three-mode division multiplexing and wavelength-division multiplexing using asymmetrical directional couplers and microring resonators.
abstract: We demonstrate silicon nitride mode-division multiplexing (MDM) and wavelength-division multiplexing (WDM) using asymmetrical directional couplers and microring resonators. Our experiments reveal three-mode multiplexing and demultiplexing. We demonstrate 30Gb/s open eye diagrams with an extinction ratio of ~9 dB for each of the three modes. We observe the worst-case modal crosstalk of ~-10 dB. Our analysis of the measured transmission spectra suggests three contributions to the observed crosstalks, with the dominant cause being a compromised input-coupling at the directional couplers in the multiplexer.
authors.forename: Yue-De
authors.initials: YD
authors.lastname: Yang
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
authors.forename: Yong-Zhen
authors.initials: YZ
authors.lastname: Huang
authors.forename: Andrew W
authors.initials: AW
authors.lastname: Poon