title: Polarization-independent vertical coupler for photonics integration.
abstract: We present the first systematic design approach for compact polarization-independent mode-size transformers based on tapered resonant vertical couplers with transfer efficiencies greater than 90%. Resonant coupling occurs at a critical taper width having equal TE and TM effective index. Being polarization-independent broadens the usefulness of vertical coupler as a building block for minimizing insertion loss in photonic integrated circuits.
authors.forename: Mee-Koy
authors.initials: MK
authors.lastname: Chin
authors.forename: Chee-Wei
authors.initials: CW
authors.lastname: Lee
authors.forename: Jinyuan
authors.initials: J
authors.lastname: Shen