Title :
Polarization rotation in semiconductor bending waveguides: a coupled-mode theory formulation
Author :
Lui, Wayne W. ; Hirono, Takuo ; Yokoyama, Kiyoyuki ; Huang, Wei-Ping
Author_Institution :
Optoelectron. Lab., Kanagawa, Japan
fDate :
5/1/1998 12:00:00 AM
Abstract :
A theoretical model for the bending waveguide polarization rotator has been developed based on the full-vectorial wave equations and the coupled-mode theory. Calculation results from this model are found to agree favorably with measurement data reported in literature. It is found that the polarization conversion efficiency of this device hinges on the degree of asymmetry of the cross-sectional field profile with respect to both the x- and y-axes. Sensitivity analysis, furthermore, revealed that the device characteristics are strongly dependent on the waveguide geometry, in particular, the sidewall tilt angle and the amount of over-etch of the ridge waveguide. Finally, it is also found that the bending waveguide polarization rotator is virtually wavelength independent, making it suitable for wavelength division multiplexing (WDM) applications
Keywords :
bending; coupled mode analysis; optical communication equipment; optical rotation; optical waveguide theory; optical waveguides; sensitivity; vectors; wave equations; wavelength division multiplexing; WDM; asymmetry; bending waveguide polarization rotator; coupled-mode theory; coupled-mode theory formulation; cross-sectional field profile; device characteristics; full-vectorial wave equations; over-etch; polarization conversion efficiency; polarization rotation; ridge waveguide; semiconductor bending waveguides; sidewall tilt angle; theoretical model; waveguide geometry; waveguide polarization rotator; wavelength division multiplexing; wavelength independent; Optical planar waveguides; Optical polarization; Optical sensors; Optical waveguide components; Optical waveguide theory; Optical waveguides; Partial differential equations; Planar waveguides; Semiconductor waveguides; Waveguide theory;
Journal_Title :
Lightwave Technology, Journal of
