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IEEE Photonics Technology Letters

Dynamics of Spectral Hole Burning in EDFAs: Dependency on Pump Wavelength and Pump Power

Lutz Rapp, João M. Ferreira

Published Jun 18, 2010• 9 citations
Publisher

Abstract

Pump wavelength and pump power dependency of the dynamical response of spectral hole burning (SHB) in erbium-doped fiber amplifiers (EDFAs) is investigated. The experimental results show a clear dependency on pump wavelength also in the 1480-nm range. Similar to other effects in EDFAs affecting transient performance, dynamics of SHB speeds up with increasing pump power. We conclude that the pump has a significant contribution to SHB and has to be taken into account in numerical models for SHB.

DOI
10.1109/lpt.2010.2052798

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Summary form only given. In this paper we report the first room temperature measurements of spectral hole-burning depths and widths of an Er-doped fiber amplifier (EDFA). The alumino-germano-silicate EDFA was pumped at 1480 nm and had a small signal gain of 25 dB at 1551 nm. Spectral gain measurements were carried out in the range 1535-1570 nm using a lock-in technique and spectral subtraction for accurate determination of SHB properties.

Optical Fiber Communication Conference•Jan 1, 1996•38 citations
Pump wavelength and pump power dependency of the dynamical response of spectral hole burning (SHB) in erbium-doped fiber amplifiers (EDFAs) is investigated. The experimental results show a clear dependency on pump wavelength also in the 1480-nm range. Similar to other effects in EDFAs affecting transient performance, dynamics of SHB speeds up with increasing pump power. We conclude that the pump has a significant contribution to SHB and has to be taken into account in numerical models for SHB.
Gain-difference spectra are used to show that 980-nm band pump wavelength changes can significantly effect spectral-hole burning (SHB) in erbium-doped fiber amplifiers (EDFAs). Gain measurements made using a number of different signal and pump wavelengths help to characterize the underlying inhomogeneous spectral properties of EDFAs and a framework for modeling these effects is presented. Despite the difficulty of obtaining the needed subpopulation specific cross section spectra, this model can be used to explain seemingly anomalous changes in the gain spectra of EDFA as a result of changes in signal or pump wavelength.
The dependence of the dynamical response of spectral hole burning (SHB) of an erbium-doped fiber amplifier (EDFA) on temperature is investigated. Experimental results show that gain variations decrease with increasing temperature. The dependence of the transition time on temperature is weak with a trend to larger values at higher temperatures. We also observe that EDFAs using two or three energy levels of the erbium ions show a similar behavior with respect to temperature variation. However, the three-level EDFA presents a higher dependence of the magnitude of induced gain variations on temperature.
Spectral hole burning (SHB) effects in a gain-flattened erbium-doped fiber amplifier (EDFA) are demonstrated to be significant in the presence of large signal power around the 1530-1532-nm wavelength range. These are the first effects reported in a setup employing equivalent power level distribution of 40 channels ranging from 1530 to 1561 nm. To explain this, the introduction of a new local population variable into the laser equation is required to support the original inversion ratio that is determined by the pump lasers. In the analysis section, spectroscopic parameters and high signal powers are considered to be other contributing parameters to the change in the gain characteristics. An improvement to this theoretical basis is suggested by implementing mathematical modeling to validate similarities between the gain shape of simulation to that obtained in the experiment.
Spectral hole burning (SHB) effects in a gain-flattened erbium-doped fiber amplifier (EDFA) are demonstrated to be significant in the presence of large signal power around the 1530-1532-nm wavelength range.These are the first effects reported in a setup employing equivalent power level distribution of 40 channels ranging from 1530 to 1561 nm.To explain this, the introduction of a new local population variable into the laser equation is required to support the original inversion ratio that is determined by the pump lasers.In the analysis section, spectroscopic parameters and high signal powers are considered to be other contributing parameters to the change in the gain characteristics.An improvement to this theoretical basis is suggested by implementing mathematical modeling to validate similarities between the gain shape of simulation to that obtained in the experiment.