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Narrow bandwidth electrooptic polarization modulator using GaAs quantum-well waveguides

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2 Author(s)
Ranalli, E.R. ; Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA ; Sonek, G.J.

An electrooptic TE-TM polarization converter using a strip-loaded GaAs-AlGaAs multiple quantum well waveguide is discussed. At a wavelength of 870.5 nm, or an energy of approximately 50 meV below the heavy hole exciton resonance, a polarization conversion efficiency of 0.6 degrees /V-mm has been achieved. In addition, a spectral bandwidth of approximately 0.6 nm has been measured for a 3.8-mm-long device. Results indicate that modal birefringence and electroabsorption, due to exciton broadening in the presence of a lateral field, has a significant effect on device efficiency and spectral bandwidth. The mode converter described should be well-suited for use with semiconductor laser diodes in optical signal processing and computing applications.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:3 ,  Issue: 4 )