期刊
OPTICS COMMUNICATIONS
卷 277, 期 2, 页码 372-378出版社
ELSEVIER
DOI: 10.1016/j.optcom.2007.05.027
关键词
quantum dot; three-level system; quantum dot-doped fiber amplifier
类别
Different from existing erbium-doped fiber amplifiers (EDFAs), PbSe quantum dot rather than conventional erbium ion is adopted as dopant in the fiber, due to its favorable emission-absorption spectra. A three-level system is proposed based on the observed emission-absorption spectra of the PbSe quantum dot. Scattering loss arising from its high refractive index and nanometer size is discussed thereafter. By a steady-state approximation, populations of the levels are expressed as an analytical function. Propagation equations of the light power with different frequencies are thereby solved by utilizing a numerical method in a single-doped case. The signal gain, bandwidth and noise of the PbSe quantum dot-doped fiber amplifier (QDFA) are estimated for different pumping powers in a single-mode condition. Depending on the emission-peak wavelength and the spectral width, the proposed QDFA can function on a long-wavelength band, with a wider bandwidth and lower noise than EDFAs. (c) 2007 Elsevier B.V. All rights reserved.
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