Silicon-on-Insulator Microring Add-Drop Filters With Free Spectral Ranges Over 30 nm
ABSTRACT We demonstrate highly compact optical add-drop filters based on silicon-on-insulator microring resonators. The microring resonators have a small radius of 2.5 mu m and a very large free spectral range ~ 32 nm at the 1.55 mu m communication band. The propagation loss in such small micoring resonators was experimentally determined and shown to be extremely important in designing microring add-drop filters with low add-drop crosstalk, low drop loss, and maximally flat drop passband. For box-like channel dropping responses, second-order optical add-drop filters with two coupled microring resonators are designed and demonstrated, and the simulation matches well with the experiment. Devices were patterned with electron-beam lithography. Two fabrication procedures utilizing different polarity of resists were introduced and compared, and the process with negative resist resulted in much smaller sidewall roughness of waveguides, thus reducing the propagation loss in microring resonators.
Full-textDOI: · Available from: Minghao Qi, Apr 04, 2015
SourceAvailable from: Xingyu Zhang[Show abstract] [Hide abstract]
ABSTRACT: Silicon photonics has experienced phenomenal transformations over the last decade. In this paper, we present some of the notable advances in silicon-based passive and active optical interconnect components, and highlight some of our key contributions. Light is also cast on few other parallel technologies that are working in tandem with silicon-based structures, and providing unique functions not achievable with any single system acting alone. With an increasing utilization of CMOS foundries for silicon photonics fabrication, a viable path for realizing extremely low-cost integrated optoelectronics has been paved. These advances are expected to benefit several application domains in the years to come, including communication networks, sensing, and nonlinear systems.Optics Express 02/2015; 23(3):2487-2511. · 3.53 Impact Factor
IET Optoelectronics 02/2015; 9(2). DOI:10.1049/iet-opt.2014.0059 · 0.97 Impact Factor
Optics Express 02/2015; 23(3). DOI:10.1364/OE.23.002487 · 3.53 Impact Factor