Effect of Recycling a Backward Ase on Performance of Double Pass L-Band Edfa
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A new double pass long wavelength band erbium-doped fibre amplifier (L-band EDFA) with a further improved gain is demonstrated using an un-pumped erbium-doped fibre (EDF) section. The wasted conventional band (C-band) backward amplified spontaneous emission (ASE) is used as a secondary pump source for the un-pumped EDF. A gain enhancement of 2 to 3.5 dB was observed without degradation in noise figure for the configuration where only the reverse propagated signal enters the un-pumped EDF. A high gain enhancement as high as 16 dB was observed especially at low pump powers for the configuration where the signal propagates twice through the un-pumped EDF. However, it degrades the noise figure severely.
Key wordserbium dopedfibre optical amplifier L-band EDFA double pass EDFA backward ASE
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- 2.F. A. Flood, “980 nm pump-band wavelengths for long wavelength EDFAs,” IEEE Photon. Technol. Lett. 11(1), pp. 42–44. (1997).Google Scholar