Signal routing by cavities in photonic crystal waveguide

Abstract

A design of all-optical signal routing circuit for the internet or telecommunication system are proposed by photonic crystal waveguide, which is composed of line of defects in periodic structure by dielectric pillars. Cavities are introduced in or by the waveguide for filtering and switching by making use of Fabry-Perot resonance for a typical carrier signal. Experimental results for the model waveguide in microwave frequency are shown to demonstrate the filtering and switching characteristics depending on length of the cavity. Proposed circuit design is applicable for high speed network switches, which is free from electronic-optical (E/O) or O/E conversion with time delay and is also free from signal labeling by substitutive use of the carrier frequency.