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Nonlinear Guided Waves and Their Applications

Ultrahigh-speed All-optical Wavelength Conversion

Byoung Seung HAM, Philip Hemmer

Published Jan 1, 2002• 0 citations
Publisher

Abstract

Ultrahigh-speed all-optical wavelength conversion has been demonstrated using a rare-earth doped crystal as a proof of principle. The observed switching time is two orders of magnitude shorter than the carrier lifetime for on-resonance transitions. This demonstration shows a breakthrough in the T1 limitation of current switching technologies.

DOI
10.1364/nlgw.2002.nlwa3

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Ultrahigh-speed all-optical wavelength conversion has been demonstrated using a rare-earth doped crystal as a proof of principle. The observed switching time is two orders of magnitude shorter than the carrier lifetime for on-resonance transitions. This demonstration shows a breakthrough in the T1 limitation of current switching technologies.
Summary form only given. Analysis of the physics of current optical switching techniques shows that the possible switching speed is less than THz even if one may use intersubband transitions of semiconductor quantum wells. The author demonstrates that the switching speed can be faster than the population relaxation time T/sub 1/ when quantum coherence is utilized. The observation of optical switching time is ten times faster than the population decay time. A spectral hole-burning crystal of Pr/sup 3+/ doped Y/sub 2/SiO/sub 5/ (Pr:YSO) is used for an initial experimental demonstration.
Using a quantum switching technique based on a two-photon coherence swapping, we experimentally demonstrate an all-optical 1×2 quantum routing, where the observed switching time of ∼5μs is two orders of magnitude faster than the carrier lifetime or the population relaxation time. Owing to the nonabsorption resonance and its enhanced nonlinearity, the observed switching efficiency (intensity ratio of switch-out signal to switch-in signal) is as high as 10%. Such an efficient and fast optical routing method has the potential to hyperterahertz all-optical quantum routers, where semiconductor quantum wells or quantum dots are chosen as the optical medium with a spin dephasing time in the range of picoseconds.
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