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Proceedings Paper

Experimental investigation of tapered erbium-doped fiber amplifiers
Author(s): Anders Grunnet-Jepsen; Kim Schuesler; Svend Dahl-Petersen; Bera Palsdottir; Anders Bjarklev; Karsten Rottwitt; Joern Hedegaard Povlsen; Thomas P. Rasmussen
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Paper Abstract

Low noise erbium-doped fiber amplifiers find widespread use in telecommunication systems. Different design ideas have been presented for such amplifiers, including various pump configurations, the use of filters, and advanced active fiber design. In this paper we present an experimental confirmation of a fiber design based on an Er/Al doped untapered fiber. As recently predicted theoretically, a continuous uptapering of the radius of the core of the active fiber from the signal input end to the signal output end improves the population inversion of the erbium in the signal input end of the fiber. This ensures that the generated amplifier spontaneous emission is reduced while the high gain properties are retained. The result is a significant reduction of the noise figure. The active fiber is pumped at 980 nm with the pump power copropagating with the signal. In this way we have demonstrated noise figure improvements in excess of 1.5 dB compared with similar conventional fibers, while still obtaining high gain. To our knowledge, this represents the first experimental verification that tapered fiber amplifiers have considerably improved noise properties. This communication will include a short description of the method used to fabricate the tapered fiber.

Paper Details

Date Published: 23 March 1993
PDF: 5 pages
Proc. SPIE 1789, Fiber Laser Sources and Amplifiers IV, (23 March 1993); doi: 10.1117/12.141123
Show Author Affiliations
Anders Grunnet-Jepsen, Univ. of Oxford (United Kingdom)
Kim Schuesler, NKT Research Ctr. A/S (Denmark)
Svend Dahl-Petersen, NKT Research Ctr. A/S (Denmark)
Bera Palsdottir, Lycom A/S (Denmark)
Anders Bjarklev, Technical Univ. of Denmark (Denmark)
Karsten Rottwitt, Technical Univ. of Denmark (Denmark)
Joern Hedegaard Povlsen, Technical Univ. of Denmark (Denmark)
Thomas P. Rasmussen, Technical Univ. of Denmark (Denmark)

Published in SPIE Proceedings Vol. 1789:
Fiber Laser Sources and Amplifiers IV
Michel J. F. Digonnet; Elias Snitzer, Editor(s)

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