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In this letter, we investigate and compare theoretically the performance of an optimized L-band erbium doped fiber amplifier when an L-band erbium doped fiber (EDF) or an optimized C-band EDF, is used separately as an ASE (amplified spontaneous emission) pump source. We show that the gain per unit length increases with increase in cut-off wavelength independent of the numerical aperture (NA) of the...
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