High Gain Erbium Doped Fiber Amplifiers
نویسندگان
چکیده
Performance improvements 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 WEr-doped and a @Erdoped fiber, for pump and signal power variations and different pump configurations. In all cases the optimum isolator position lies within 1037% of the total fiber length for small signal operation.
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