title: Asymmetric Y junctions in silicon waveguides for on-chip mode-division multiplexing.
abstract: Silicon waveguide asymmetric Y junction mode multiplexers and demultiplexers are demonstrated for applications in on-chip mode-division multiplexing (MDM). We measure demultiplexed crosstalk as low as -30 dB, <-9 dB over the C band, and insertion loss <1.5 dB for multimode links up to 1.2 mm in length. The frequency response of these devices is shown to depend upon Y junction angle and multimode interconnect length. Interference effects are shown to be advantageous for low-crosstalk MDM, even while using compact Y junctions designed to be outside the mode-sorting regime.
authors.affiliation: Microelectronics Sciences Laboratories, Columbia University, New York, New York 10027, USA. jbd2112@columbia.edu
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Driscoll
authors.forename: Richard R
authors.initials: RR
authors.lastname: Grote
authors.forename: Brian
authors.initials: B
authors.lastname: Souhan
authors.forename: Jerry I
authors.initials: JI
authors.lastname: Dadap
authors.forename: Ming
authors.initials: M
authors.lastname: Lu
authors.forename: Richard M
authors.initials: RM
authors.lastname: Osgood