Abstract
In this paper, the noise figure improvement of an erbium-doped fiber amplifier with double-pass configuration is demonstrated. By utilizing a high birefringence fiber loop mirror as the amplified spontaneous emission rejecter, the noise figure of this erbium-doped fiber amplifier (EDFA) greatly decreases compared with that of the EDFA using a conventional 3 dB fiber loop mirror. Moreover, stability observation of the amplifier output spectra ensures its applicability for practical applications.
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