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Analysis of Light Propagation in an Y-junction of Diffused Ti: LiNbO3 Strip Waveguides and in a Guided-Wave Mach - Zehnder Electroopic Modulator.

Expressions for refractive index distribution in diffused Y-junction have been obtained. The dependence of the power losses on the Y-junction half angle has been determined and the possibility of reduction of losses by decreasing refractive index in the junction center has been proved. Calculated field distributions oscillate from side to side in the Y-junction and Mach-Zehn-der interferometric modulators monomode branches; taking into account these oscillations allows to avoid excessive losses. Obtained results allow to optimise the Y-junction and modulator's geometric dimensions.