H.F. Bulthuis

Experimental and numerical study of SiON microresonators with air and polymer cladding

A systematic experimental and numerical study of the device performance of waveguide-coupled SiON microresonators with air and polymer cladding is presented. Values of device parameters like propagation losses of the microresonator modes, the off-resonance insertion losses, and the straight waveguide to microresonator coupling are determined by applying a detailed fitting procedure to the experimental results and compared to results of detailed numerical simulations. By comparing the propagation losses of the fundamental TE polarized microresonator mode obtained by fitting to the measured spectra to the also experimentally determined propagation losses in the adjacent straight waveguide and the materials losses, it is possible to identify the loss mechanisms in the microresonator. By comparing experimental results for microresonators with air and polymethylmethacrylate cladding and a detailed numerical study, the influence of the cladding index on the bend losses is evaluated. It is demonstrated that the presence of an upper cladding can, under the right conditions, actually be beneficial for loss reduction.

Design and characterization of waveguide-coupled cylindrical microring resonators in Si/sub 3/N/sub 4/

Cylindrical micro-resonators have been proposed as all-optical switch, micro-laser, add-drop filters and they open the route to large area reduction complex integrated optics devices. They have been studied in literature both theoretically and experimentally. In this paper we present preliminary results of microring resonators in Si/sub 3/N/sub 4/ technology. The experimental free spectral ranges and finesses of the ring modes are compared with detailed simulations.

Minimized losses in a cylindrical microresonator by use of a cladding: experimental and numerical study

We present an experimental study of the influence of a cladding on the losses in a Si/sub 3/N/sub 4/ on SiO/sub 2/ cylindrical microresonator (MR). The experimental results are corroborated with detailed numerical simulations and examples of devices which exploit the presence of a cladding are given.