All-optical controllable channel-drop filters in two-dimensional square-lattice photonic crystals

Abstract

A novel all-optical controllable channel-drop filter in photonic crystals (PC) of square lattice is presented. We show that using a resonant-cavity-based add-drop filter with a wavelength-selective reflection feedback and a single-control switching module which is based on nonlinear PC microcavities, the dropped channel can be routed to the drop port or returned to the bus waveguide. Using the temporal coupled-mode theory and two-dimensional nonlinear finite-difference time-domain method, the performance of the proposed device is investigated and the simulation results show the validity of the proposed design.

Keywords:

• all-optical switch
• channel-drop filter (CDF), coupled-mode theory (CMT)
• finite-difference time-domain (FDTD)
• optical Kerr effect
• photonic crystal (PC)
• T-branch waveguide

Disclosure statement

No potential conflict of interest was reported by the author.