| 要約: | A new double pass long wavelength band erbium-doped fibre amplifier (L-band EDFA) with a further improved gain is demonstrated using double pass technique with a first 5 m of the EDF is unpumped. The wasted conventional band (C-band) backward amplified spontaneous emission (ASE) is used as a secondary pump source for the unpumped EDF. Our experimental results have shown that, compared to a conventional double pass amplifier, the gain coefficient can be improved considerably from 0.24 dB/mW to 0.40 dB/mW. The new amplifier uses only 67% of the pump power to achieve a gain value equal to that for the conventional amplifier. The maximum gain enhancement of 22.5 dB was observed at a signal wavelength of 1568 nm of while signal and pump powers were fixed at -30 dBm and 62 mW, respectively.
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