Abstract
Fabrication of the single modal channel waveguides in lithium niobate with a large waveguide-substrate index difference meets technological and material difficulties. It has been proved during our experimental work that because of the photolithography limitations low index increase in the channel region resulting in monomodal waveguiding needs more sophisticated technology. The waveguiding effect arises in the processed region in an annealing carefully performed after proton exchange. The precise control of redistribution of the dopant is realized by m-line spectroscopy of the processed area at the wavelength (lambda) ' < (lambda) <SUB>op</SUB>-operation wavelength. The method of precise control of waveguiding properties at (lambda) ' is especially useful for manufacturing of the optical switches aimed at the wavelengths of the transmission bands of long-distance communication fibers.
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