GAIN AND NOISE FIGURE IMPROVEMENT OF 1,480 NM-PUMPED L-BAND EDFA USING EMBEDDED ISOLATOR
Keywords:
Erbium, optical amplifiers, optical communications, wavelength division multiplexingAbstract
A new architecture of low-noise 1,480 nm-pumped long-wavelength band Erbium-doped fibre amplifier was persented. The enabling device was the isolator embedded between first stage and second-stage amplifiers. The signal and pump lights could pass through the isolator that significantly reduced the insertion loss compared to the traditional approach. The isolator also suppressed the propagation of backward amplified spontaneous emission from the second-stage amplifier to the first-stage amplifier. Thus, gain improvement between 0.6 and 3 dB was obtained from 1,569.6 to 1,604.2 nm for -7 dBm input power. Consequently, the noise figure improvement up to 0.5 dB was observed at short wavelengths.
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