2008/06/17 by Fangwei Ye, Yaroslav V. Kartashov, Victor A. Vysloukh +2 · 1 citation
Engineering · Physics and Astronomy · #Acoustics #Advanced Fiber Laser Technologies #Computer science #Hybrid coupler #Lattice (music) #Nonlinear Photonic Systems #Nonlinear system #Optical switch #Optics #Optoelectronics #Photonic Crystal and Fiber Optics #Photonic crystal #Photonics #Physics #Power dividers and directional couplers #Refractive index #SIGNAL (programming language) #nlin.PS #physics.optics
paper · pdf · doi:10.1103/physreva.78.013847
published as Physical Review A 78, 013847 (2008) · 13 pages, 4 figures, to appear in Physical Review A
arxiv created 2008/06/17 · openalex publication_date 2008/07/31 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We address nonlinear signal switching between two low-index defect channels induced in periodic optical lattices. In contrast to conventional directional couplers, where the guiding mechanism is total internal reflection or refraction, in such a Bragg-type coupler, the guidance is of a photonic--band-gap origin. The coupling length in the low-index coupler is controlled by the lattice parameters and by the channel spacing. In the nonlinear regime the Bragg-type coupler behaves as an all-optical switch, exhibiting a remarkable difference of switching power for focusing versus defocusing nonlinearity.