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23 March 1993 Experimental investigation of tapered erbium-doped fiber amplifiers
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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.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anders Grunnet-Jepsen, Kim Schuesler, Svend Dahl-Petersen, Bera Palsdottir, Anders Bjarklev, Karsten Rottwitt, Joern Hedegaard Povlsen, and Thomas P. Rasmussen "Experimental investigation of tapered erbium-doped fiber amplifiers", Proc. SPIE 1789, Fiber Laser Sources and Amplifiers IV, (23 March 1993);


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