Design for broadband on-chip isolator using stimulated Brillouin scattering in dispersion-engineered chalcogenide waveguides

作者：Poulton Christopher G; Pant Ravi; Byrnes Adam; Fan Shanhui; Steel M J; Eggleton Benjamin J

来源：Optics Express, 2012, 20(19): 21235-21246.

DOI：10.1364/OE.20.021235

We propose a scheme for on-chip isolation in chalcogenide (As2S3) rib waveguides, in which Stimulated Brillouin Scattering is used to induce non-reciprocal mode conversion within a multi-moded waveguide. The design exploits the idea that a chalcogenide rib buried in a silica matrix acts as waveguide for both light and sound, and can also be designed to be multi-moded for both optical and acoustic waves. The enhanced opto-acoustic coupling allows significant isolation (%26gt; 20 dB) within a chip-scale (cm-long) device (%26lt; 10 cm). We also show that the bandwidth of this device can be dramatically increased by tuning the dispersion of the waveguide to match the group velocity between optical modes: we find that 20 dB isolation can be extended over a bandwidth of 25 nm.

• 出版日期2012-9-10