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Article

Title: Laser Developers Eye the Dots

Author: Hardy, Stephen Article Type: Product Analysis
Source: Lightwave, v23 n9 p1(3) Publication Date: Sep 2006
  ISSN: 0741-5834
  Illustrations: Charts
URL of Publication: http://www.lightwaveonline.com

Several companies have announced plans to bring commercial products based on quantum dots and telecommunication lasers to the market. Doubts are still present regarding an ability to economically produce devices consonant with the technology, but research has gone forward to the extent that quantum dots are likely to be proven to be commercially feasible within the lifetime of current developers of modules. Quantum dots can be regarded as nanometer-scale islands that confine electrons and holes in 3 dimensions, and quantum-well-based semiconductor lasers keep carriers along one axis. Energy levels in each dot are discrete in the manner of atoms, while bulk and quantum-wells structures show continuous dispersion ranges. Researchers combine many layers of quantum dots to strengthen modal gain. Among the advantages of quantum dots cited by proponents are high temperature stability, broad gain spectrum, fast carrier dynamics, and low jitter, in addition to an ability to lase at the 1,300- and 1,550nm wavelengths that are of interest to telecommunication equipment designers. Among topics covered are applications proposed for dots, countries leading in research, and the formation by Fujitsu and Mitsui of QD Laser, a company that will home in on the optical access and enterprise spaces.

Special Features: Charts

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Quantum Dots

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