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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 26 — Dec. 24, 2007
  • pp: 17922–17927

Ultrafast all-optical switching with low saturation energy via intersubband transitions in GaN/AlN quantum-well waveguides

Yan Li, Anirban Bhattacharyya, Christos Thomidis, Theodore D. Moustakas, and Roberto Paiella  »View Author Affiliations

Optics Express, Vol. 15, Issue 26, pp. 17922-17927 (2007)

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A fiber-optic pump-probe setup is used to demonstrate all-optical switching based on intersubband cross-absorption modulation in GaN/AlN quantum-well waveguides, with record low values of the required control pulse energy. In particular, a signal modulation depth of 10 dB is obtained with control pulse energies as small as 38 pJ. Such low power requirements for this class of materials are mainly ascribed to an optimized design of the waveguide structure. At the same time, the intersubband absorption fully recovers from the control-pulse-induced saturation on a picosecond time scale, so that these nonlinear waveguide devices are suitable for all-optical switching at bit rates of several hundred Gb/s.

© 2007 Optical Society of America

OCIS Codes
(190.5970) Nonlinear optics : Semiconductor nonlinear optics including MQW
(230.7370) Optical devices : Waveguides

ToC Category:
Nonlinear Optics

Original Manuscript: October 17, 2007
Revised Manuscript: December 12, 2007
Manuscript Accepted: December 13, 2007
Published: December 17, 2007

Yan Li, Anirban Bhattacharyya, Christos Thomidis, Theodore D. Moustakas, and Roberto Paiella, "Ultrafast all-optical switching with low saturation energy via intersubband transitions in GaN/AlN quantum-well waveguides," Opt. Express 15, 17922-17927 (2007)

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Fig. 1. Fig. 2. Fig. 3.

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