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Improved coupled-mode theory for anisotropic waveguide modulators

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3 Author(s)
Tian Feng ; Opt. Commun. Lab., Beijing Univ. of Posts & Telecommun., China ; Wu, Y.-Z. ; Ye, P.-D.

An improved coupled-mode theory for the propagation of modulated light waves in anisotropic dielectric waveguides is presented. Starting from Maxwell's equations, a partial differential equation is derived to describe mode-coupling between two normal modes which may propagate in anisotropic waveguide systems under modulation. The theory is applied to the analysis of typical waveguide modulators; examples for LiNbO3 phase modulator, Mach-Zehnder, and directional coupler modulator are presented. The theory is applicable to both bulk and waveguide modulators/switches from DC to the high-frequency band. The only limitation is that the modulating wave has to propagate collinearly to the light waves

Published in:

Quantum Electronics, IEEE Journal of  (Volume:24 ,  Issue: 3 )