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Applied Optics

Applied Optics


  • Vol. 37, Iss. 9 — Mar. 20, 1998
  • pp: 1674–1681

Polarization-insensitive electroabsorption by use of quantum well interdiffusion

Wallace C. H. Choy and E. Herbert Li  »View Author Affiliations

Applied Optics, Vol. 37, Issue 9, pp. 1674-1681 (1998)

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A paraboliclike quantum well structure can be used to produce polarization-insensitive waveguide type modulators. We propose the use of interdiffusion of AlGaAs/GaAs quantum wells to achieve the parabolic well shape. Criteria to achieve the paraboliclike quantum wells by interdiffusion are discussed. The theoretical results indicate that interdiffused quantum wells can produce equal eigenstate spacing, polarization insensitive Stark shifts, and modulation similar to an ideal parabolic quantum well. Three procedures are also proposed to develop polarization-insensitive on and off states in paraboliclike interdiffused quantum wells. The modulation depth is compatible with that of the measured parabolic quantum wells. For diffused quantum wells one can take advantage of using an as-grown rectangular quantum well with postgrowth thermal processing. These features demonstrate that an interdiffused quantum well structure can be used to produce a polarization-insensitive electroabsorptive modulator.

© 1998 Optical Society of America

OCIS Codes
(230.5440) Optical devices : Polarization-selective devices
(260.6580) Physical optics : Stark effect
(270.0270) Quantum optics : Quantum optics

Original Manuscript: June 20, 1997
Revised Manuscript: September 25, 1997
Published: March 20, 1998

Wallace C. H. Choy and E. Herbert Li, "Polarization-insensitive electroabsorption by use of quantum well interdiffusion," Appl. Opt. 37, 1674-1681 (1998)

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