title: Experimental demonstration of bidirectional light transfer in adiabatic waveguide structures.
abstract: We propose and demonstrate a novel type of optical integrated structure consisting of three adiabatically coupled waveguides arranged in an N-shaped geometry. Unlike conventional adiabatic three-waveguide couplers mimicking the stimulated Raman adiabatic passage process which utilize solely the counter-intuitive coupling and, thus, operate only in one direction, our structure achieves complete bidirectional light transfer between two waveguides through the counter-intuitive and intuitive coupling in either direction over a wide wavelength range. Moreover, the light transfer through the intuitive coupling is more efficient and robust than through the counter-intuitive coupling.
authors.forename: Tong
authors.initials: T
authors.lastname: Liu
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Solntsev
authors.forename: Andreas
authors.initials: A
authors.lastname: Boes
authors.forename: Thach
authors.initials: T
authors.lastname: Nguyen
authors.forename: Christian
authors.initials: C
authors.lastname: Will
authors.forename: Arnan
authors.initials: A
authors.lastname: Mitchell
authors.forename: Dragomir N
authors.initials: DN
authors.lastname: Neshev
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Sukhorukov