Abstract
The dramatic phase shift and high transmission enable the over-coupled microring resonators for efficient pure phase modulator. Its compact size is especially valuable for large-scale coherent all-optical logic circuit and phase arrays on chip. In this letter, we examine the impact of fabrication imperfection-induced mode splitting for the microring-based phase shifters. We initially measure the phase shift in mode-splitting ring resonators, with the results fitted by coupled mode theory (CMT). Based on the extracted parameter space from the experimental data, we then studied the influence of surface roughness-induced photon scattering for the maximum phase shift and insertion loss of the microring resonators. Surface roughness pushes the ring-waveguide coupling condition from over-coupling toward under-coupling region. The maximum phase shift reduces from $2\pi $ to only 1 rad accordingly.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
