Title :
Polarization-independent waveguide modulator using a novel quantum well with mass-dependent width
Author :
Yamaguchi, T. ; Morimoto, T. ; Akeura, K. ; Tada, K. ; Nakano, Y.
Author_Institution :
Dept. of Electron. Eng., Tokyo Univ., Japan
Abstract :
We propose a novel quantum well (QW) structure with two or four thin barriers inserted in which effective width of the well is mass-dependent. It is very useful for polarization-independent optical modulation. Incorporation of tensile strain is also discussed for further improvement of the polarization insensitivity. Fabrication of a modulator with lattice-matched QW´s results in 6-V switching voltage with more than -10-dB extinction (--30 dB maximum) for both TE and TM modes over 29-nm wavelength range. Compared with the quasiparabolic QW, this new quantum well has better fabrication tolerance, wider wavelength range of operation, and higher yield.<>
Keywords :
electro-optical modulation; integrated optics; light polarisation; optical waveguide components; semiconductor quantum wells; 6 V; TE modes; TM modes; effective width; extinction; fabrication; fabrication tolerance; higher yield; lattice-matched QW; mass-dependent width; polarization insensitivity; polarization-independent waveguide modulator; quantum well; switching voltage; tensile strain; thin barriers; wider wavelength range of operation; Effective mass; Excitons; Magnetic confinement; Optical device fabrication; Optical modulation; Optical polarization; Optical sensors; Optical waveguides; Potential well; Tellurium;
Journal_Title :
Photonics Technology Letters, IEEE
