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Elsevier, Optics Communications, 12(282), p. 2335-2338

DOI: 10.1016/j.optcom.2009.02.063

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Design and fabrication of an intrinsically gain flattened Erbium doped fiber amplifier

Journal article published in 2009 by B. Nagaraju, Mukul Chandra Paul, Mrinmay Pal, A. Pal, Ravi K. Varshney, Bishnu P. Pal, Shyamal Kumar Bhadra, Gérard Monnom, Bernard Dussardier ORCID
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This paper is available in a repository.

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Abstract

We report design and subsequent fabrication of an intrinsically gain flattened Erbium doped fiber amplifier (EDFA) based on a highly asymmetrical and concentric dual-core fiber, inner core of which was only partially doped. Phase-resonant optical coupling between the two cores was so tailored through optimization of its refractive index profile parameters that the longer wavelengths within the C-band experience relatively higher amplification compared to the shorter wavelengths thereby reducing the difference in the well-known tilt in the gains between the shorter and longer wavelength regions. The fabricated EDFA exhibited a median gain >= 28 dB (gain excursion below +/- 2.2 dB within the C-band) when 16 simultaneous standard signal channels were launched by keeping the I/P level for each at -20 dBm/channel. Such EDFAs should be attractive for deployment in metro networks, where economics is a premium, because it would cut down the cost on gain flattening filter head. (C) 2009 Elsevier B.V. All rights reserved.