Integrated Tunable Distributed Feedback Reflection Filter Based on Double-Layer Graphene

A silicon waveguide integrated electrically tunable distributed feedback grating device based on double-layer graphene is proposed and analysed by mode coupling theory and finite element simulation method. The theroresults show that with the graphene fermi energy level change from 0. 5eV to 0. 8eV, the center wavelength of TM mode reflection spectrum shifts from 1. 55um to shorter wave by 3. 9nm, and the center wavelength of TE mode reflection spectrum shifts from 1. 89um to shorter wave by 4. 8nm. The graphene electrically tunable distributed feedback grating device may has potential application in the integrated tunable wavelength selection device.