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Optical Switch by Light Intensity Control in Cascaded Coupled Waveguides
Hiroki KISHIKAWA Nobuo GOTO
IEICE TRANSACTIONS on Electronics
Publication Date: 2007/02/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Lasers, Quantum Electronics
optical switch, optical coupler, coupled-mode theory, finite-difference beam-propagation method, wavelength-selectivity,
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Lightwave switching is discussed with a cascaded connection of optical couplers with light intensity control elements. By employing wavelength-selective amplifiers such as a waveguide-type Raman amplifier, all-optical wavelength-selective switching can be realized. We discuss analytically using coupled-mode theory that the lightwave switching is feasible by controlling the intensity of propagating lightwave. The switching operation is verified numerically using finite-difference beam-propagation method. As a result, the expected operation is realized and some characteristics involved with dependencies of wavelength and phase are also investigated. A preliminary experiment using attenuators, beam splitters and mirrors is also described to verify the switching operation with only light-intensity control in interferometers.