Compact 90° trench-based splitter for silicon-on-insulator rib waveguides

Abstract

Compact silicon-on-insulator (SOI) rib waveguide 90 degrees splitters based on narrow, high-aspect ratio (~10:1) trenches are designed and experimentally demonstrated. The splitter area is only 11 mum x 11 mum. Splitter optical performance is investigated as a function of both trench width and refractive index of the trench fill material. We examine three trench fill materials, air (n=1.0), SU8 (n=1.57), and index matching fluid (n=1.733), and find good agreement between experimental measurement and three dimensional (3D) finite difference time domain (FDTD) simulation. A splitting ratio of 49/51 (reflection/transmission) is measured for an index fluid-filled trench 82nm wide.

66.3: Design of Color Backlight for High Efficiency Display using Optical Waveguide Gratings

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Optimization of Y-splitting antiresonant reflecting optical waveguides-based rib waveguides

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Active Integrated Filters for RF-Photonic Channelizers

“…The couplers design method proposed here is based on a concept of frustrated total internal reflection, which achieves a compact and efficient way of controlling signal reflection and transmission coefficients [12,13]. Also, these couplers may be fabricated using conventional microelectronics processing techniques that make it more advantageous [14].…”