Abstract
A new coupled waveguide type multi/demultiplexer is proposed together with a fabrication method which can compensate for the shift Δλ0 in wavelength caused by fabrication errors. This waveguide formed on a low refractive index layer is embedded by a cladding layer with index nc. In this structure, Δλ0 can be compensated for by optimizing nc (which is calculated by measuring the deviations from the design values for core width, core height, and waveguide separation) before cladding the waveguide. A cladding material with an optimum nc is coated on the entire waveguide including the cores.
© 1989 Optical Society of America
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