Quantum limited noise figure operation of high gain erbium doped fiber amplifiers

Ole Lumholt, Jørn Hedegaard Povlsen, Kim Schüsler, Anders Overgaard Bjarklev, Svend Dahl-Petersen, Thomas Rasmussen, Karsten Rottwitt

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    Performance improvements obtained by using an isolator as an amplified-spontaneous-emission-suppressing component within erbium-doped fibers are evaluated. Simultaneous high-gain and near-quantum-limited noise figures can be obtained by such a scheme. The noise figure improves for input signal powers below -5 dBm, and an improvement of 2.0 dB with a simultaneous gain increase of 4.1 dB is measured relative to a gain-optimized fiber. The optimum isolator location is evaluated for different pump and signal wavelengths in both an Al/Er-doped and a Ge/Er-doped fiber, for pump and signal power variations and different pump configurations. In all cases the optimum isolator position lies within 10-37% of the total fiber length for small signal operation
    Original languageEnglish
    JournalJournal of Lightwave Technology
    Issue number8
    Pages (from-to)1344-1352
    Publication statusPublished - 1993

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    Copyright: 1993 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE


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