High performance fully etched isotropic microring resonators in thin-film lithium niobate on insulator platform

• DOI: 10.1364/oe.27.022025
• Publication Date: 2019-07-19T15:30:16Z
• Authors: Meisam Bahadori; Yansong Yang; Lynford L. Goddard; Songbin Gong
• Keywords: Signal Processing (eess.SP); FOS: Electrical engineering, electronic engineering, information engineering; 0202 electrical engineering, electronic engineering, information engineering; FOS: Physical sciences; Physics - Applied Physics; Applied Physics (physics.app-ph); 02 engineering and technology; Electrical Engineering and Systems Science - Signal Processing; 7. Clean energy

We present our design, fabrication, and experimental results for very highperformance isotropic microring resonators with small radii (~ 30 μm) based on single-mode strip waveguides transverse magnetic (TM) polarization in a fully etched lithium niobate (Z-cut) thin-film insulator.The loss of the devices is predicted to be < 10 dB/cm, measured ~ 7 dB/cm.The optical responses exhibit an extinction 25 dB (close critical coupling), 3 bandwidth 49 pm 6 GHz) all-pass structures, add-drop free spectral range 5.26 nm, all which are excellent agreement design.This work first step towards ultra-compact modulators insulator.