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Use of the Coaxial-Core Profile in the Erbium-Doped Fiber Amplifier for Self-Regulation of Gain Spectrum

Jaedeuk LEE, Hugh SONG, Kyunghwan OH

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Summary :

Coaxial-core erbium-doped fiber amplifiers (EDFA's) having a property of self-regulated gain spectrum are developed. The operation of a coaxial-core EDFA is based on the partial separation of the light paths for different wavelength channels in the directionally-coupled waveguides of a coaxial-core geometry. The degree of channel equalization depends on the geometrical and optical parameters of the coaxial-core EDFA and on relative channel power levels. A numerical analysis based on the coupled-mode theory and on the rate equation shows that, under fully optimized conditions, a coaxial-core EDFA provides equalization rates in excess of -0.4 dB per dB of input-power imbalance in the case with two WDM channels. A cascade experiment demonstrates the effect of coaxial-core EDFA's toward channel-power equalization in fiber links with a small number of WDM channels.

Publication
IEICE TRANSACTIONS on Communications Vol.E82-B No.8 pp.1273-1282
Publication Date
1999/08/25
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Joint Special Issue on Recent Progress in Optoelectronics and Communications)
Category
Optical Fibers and Cables

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