3D printed on-chip microtoroid resonators and nested spiral photonic devices

An integrated polymer microtoroid resonator system fabricated using single-step,two-photon polymerization laser lithography is reported.The integrated microtoroid-waveguide system includes an integrated coupling waveguide for ease of optical coupling and has a quality factor of 16,000.We further demonstrate a nested doublespiral waveguide that allows higher spatial density of data,akin to a macroscopic form of space-division multiplexing.Experimental characterization reveals good transmission properties in the double-spiral waveguide device.In addition,the waveguides are demonstrated to support 30 Gb/s nonreturn-to-zero and 28 Gb/s pulse amplitude modulation 4 high-speed data.