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Si-Waveguide with Ferro-Electric Liquid Crystal Cladding for Use in Optical Switching Devices
Katsumi NAKATSUHARA Toyokazu SASAKI Hiroki SATO Takakiyo NAKAGAMI
IEICE TRANSACTIONS on Electronics
Publication Date: 2007/05/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Integrated Photonic Devices)
Category: High Index Contrast and Photonic Crystal Devices
optical switching device, ferro-electric liquid crystal, waveguide device,
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We studied a silicon (Si) waveguide using ferro-electric liquid crystal (FLC) cladding for various applications in optical networks. The FLCs in the cladding layer change their effective refractive index corresponding to the applied voltage polarity, and give a phase shift to the traveling lightwave in the waveguides. The phase change coefficients of three-layer slab waveguides with FLC/Si/SiO2 structure were calculated. We observed an amplitude change in the output light of an experimental modulator consisting of a Mach-Zehnder interferometer with FLC-cladding Si-rib waveguides on a silicon-on-insulator wafer, and evaluated the phase shift at a wavelength of 1550 nm. We propose optical switching devices using Si-rib waveguide Mach-Zehnder interferometers having FLC cladding. Switching of experimental devices operating at 1550 nm wavelength was demonstrated.