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| - The waveguide above is typically part of an optical device such as an optical switch, shutter, attenuator, phase shifter, wavelength-selective filter, or other device based on, e.g., a delta-beta (evanescent) coupler, Mach-Zehnder interferometer, multimode interferometer, a grid of reflection elements, or other optical devices used in telecommunications systems and/or data transmission systems.
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