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Electronics Letters

Spectral hole burningin silica-based and in fluoride-based optical fibre amplifiers

I. Joindot, F. Dupré

Published Jul 3, 1997• 11 citations
Publisher

Abstract

The results of spectral hole burning measurements in silica-based and in fluoride-based erbium-doped optical fibre amplifiers are compared. In silica-based fibre, the spectral hole appears clearly, while in fluoride-based fibre, the shape is different and weaker effects occur around the saturating wavelength.
DOI
10.1049/el:19970807

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Abstract We observed for the first time to our knowledge the presence of replica holes in the fluorescencespectrum of EDFA. Saturating the Er 3+ transition at a single wavelength we noticed theappearance of spectral holes in the ASE other than the usual one around the saturating laser. Wequalitatively explain the effect and confront the experimental results with the homogeneouslybroadened model. Introduction One of the limiting factors to state-of-the-art DWDM systems is the effect of Spectral Hole Burning (SHB) inErbium Doped Fiber Amplifiers (EDFAs). It has been already observed that the presence of a saturating signal ina given wavelength induces a hole around the signal in the gain and Amplified Spontaneous Emission (ASE)spectra [1],[2]. These holes in EDFAs are typically between 2 and 8 nm width, which is enough to degrade theneighboring channels. The SHB effect is due to the inhomogeneous broadening of the Er 3+ transitions, causedby site-to-site variations of the local electric field in the silica based host, which induces different ions laser linesproperties.This work shows the existence of spectral holes burned at wavelengths far from the saturating laserline, called Spectral Replica Holes (SRHs). The physical background that explains SRHs is based on theinhomogeneously broadened two-level Stark Splitted

•Jan 1, 2003•1 citation
\n\nSpectral hole-burning in an erbium-doped silica fibre at room temperature has been experimentally demonstrated. This demonstration can be considered as a clear experimental evidence of the relationship between slow light and coherent population oscillations in erbium-doped fibres. In a 3.5 m erbium-doped silica fibre, spectral holes with a depth up to 1.5textm−11.5\\ \\text{m}^{-1}1.5textm−1 were obtained by coupling a strong and narrow saturating power and measuring changes in the spectral absorption coefficient for a weak and wide probe power. A tuneable ring-cavity erbium-doped fibre laser was employed as saturating source. To obtain a higher saturating power, laser emission was amplified by means of a second fibre amplifier.\n
Abstract We observed for the first time to our knowledge the presence of replica holes in the fluorescencespectrum of EDFA. Saturating the Er 3+ transition at a single wavelength we noticed theappearance of spectral holes in the ASE other than the usual one around the saturating laser. Wequalitatively explain the effect and confront the experimental results with the homogeneouslybroadened model. Introduction One of the limiting factors to state-of-the-art DWDM systems is the effect of Spectral Hole Burning (SHB) inErbium Doped Fiber Amplifiers (EDFAs). It has been already observed that the presence of a saturating signal ina given wavelength induces a hole around the signal in the gain and Amplified Spontaneous Emission (ASE)spectra [1],[2]. These holes in EDFAs are typically between 2 and 8 nm width, which is enough to degrade theneighboring channels. The SHB effect is due to the inhomogeneous broadening of the Er 3+ transitions, causedby site-to-site variations of the local electric field in the silica based host, which induces different ions laser linesproperties.This work shows the existence of spectral holes burned at wavelengths far from the saturating laserline, called Spectral Replica Holes (SRHs). The physical background that explains SRHs is based on theinhomogeneously broadened two-level Stark Splitted