Title :
Improved Push–Pull Polarization Modulation Using Coupled Quantum-Well Structures
Author :
Ristic, Sasa ; Jaeger, Nicolas A F
Author_Institution :
Dept. of Electr. & Comput. Eng., British Columbia Univ.
fDate :
5/15/2007 12:00:00 AM
Abstract :
Recently, we proposed a push-pull polarization-modulation scheme based on multiple repetitions of two InGaAlAs-InAlAs coupled quantum-well (CQW) structures. Additional numerical simulations showed one of the two CQW structures to be quite sensitive to layer thickness and compositional variations. Consequently, it would be challenging to reliably grow polarization modulators using this structure. Here, using the effective-mass envelope-function approximation, we design a more robust CQW structure to replace the sensitive one, and we also make improvements to the less sensitive of the two original structures
Keywords :
III-V semiconductors; aluminium compounds; effective mass; gallium arsenide; gallium compounds; indium compounds; integrated optics; light polarisation; optical modulation; quantum well devices; InGaAlAs-InAlAs; InGaAlAs-InAlAs quantum-well; coupled quantum-well structures; effective-mass approximation; envelope-function approximation; polarization modulators; push-pull polarization modulation; Excitons; Optical polarization; Optical refraction; Optical sensors; Optical waveguides; Quantum well devices; Quantum wells; Refractive index; Robustness; Wave functions; Coupled quantum wells (CQWs); InGaAlAs; electrorefraction; polarization modulation; quantum-well modulator; strain-compensated layers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.895433
