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Highly efficient Er-doped fibre amplifiers pumped in 660 nm band

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5 Author(s)
M. Horiguchi ; NTT Opto-electron. Labs., Ibaraki, Japan ; M. Shimizu ; M. Yamada ; K. Yoshino
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High gain coefficient in an erbium-doped fibre amplifier, 3.8 dB/mW at 1.536 mu m and 2.3 dB/mW at 1.552 mu m, is achieved for a pump wavelength of 664 nm by using an erbium-doped fibre with a high numerical aperture of 0.285 and thermally-diffused expanded core fibre ends. The gain at 1.536 mu m reaches 30 and 35 dB for launched pump powers of 10 and 15 mW, respectively.

Published in:

Electronics Letters  (Volume:27 ,  Issue: 25 )