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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1993),
  • paper CThH2

24 ps switching with a Mach-Zehnder type all-optical switch based on the band filling nonlinearity of GaAs

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Abstract

All-optical switching is attractive for future ultra-high-speed optical communication and data processing. Such switches would use nonlinear refractive index change. Among fast nonlinear effects, nonresonant effects are inefficient, requiring very high light intensities Resonantly enhanced coherent effects (e.g., AC-Stark) are fast and more efficient, but still require very high peak intensities. Further, they require materials with long phase relaxation times that are difficult to achieve. The two-photon absorption and other competing effects are also serious problems that have to be overcome to utilize such effects2,3 On the other hand, band-filling nonlinearity (BFN) is efficient and does not suffer from those problems, but the problem is slow relaxation times (carrier lifetime). Here we report results of ultra fast all-optical switching experiments using BFN.

© 1993 Optical Society of America

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