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Design scheme for Mach–Zehnder interferometric coarse wavelength division multiplexing splitters and combiners

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Abstract

I propose an analytical approach to design flattened wavelength splitters with cascaded Mach–Zehnder interferometers when wavelength dependence of the directional couplers cannot be neglected. I start from a geometrical representation of the action of a doubly point-symmetrical filter, assuming no wavelength dependence of the couplers. Next I derive the analytical formulas behind its working principle and extend them to the wavelength-dependent case. I also show how the geometrical representation allows one to broaden the class of working structures.

© 2006 Optical Society of America

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Equations (6)

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