Title :
Highly efficient Er-doped fibre amplifiers pumped in 660 nm band
Author :
Horiguchi, M. ; Shimizu, M. ; Yamada, M. ; Yoshino, K. ; Hanafusa, H.
Author_Institution :
NTT Opto-electron. Labs., Ibaraki, Japan
Abstract :
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.
Keywords :
erbium; fibre lasers; optical pumping; 1.536 micron; 1.552 micron; 10 to 15 mW; 30 to 36 dB; 664 nm; fibre amplifier; gain; gain coefficient; numerical aperture; pump powers; pump wavelength; thermally-diffused expanded core fibre ends;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19911436
