Use of the coaxial-core profile in the erbium-doped fiber amplifier for self-regulation of gain spectrum

Jaedeuk Lee, Hugh Song, Kyunghwan Oh

Research output: Contribution to journalArticle


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.

Original languageEnglish
Pages (from-to)1273-1281
Number of pages9
JournalIEICE Transactions on Communications
Issue number8
Publication statusPublished - 1999 Jan 1


All Science Journal Classification (ASJC) codes

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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