Title :
Efficient erbium-doped fibre amplifier pumped at 820 nm
Author :
Nakazawa, Masataka ; Kimura, Yuichi ; Yoshida, Erika ; Suzuki, Kenji
Author_Institution :
NTT Transmission Syst. Labs., Ibaraki, Japan
Abstract :
The highest gain coefficients of 0.86 dB/mW at 1.552 mu m and 0.72 dB/mW at 1.534 mu m are realised at a pumping wavelength of 822 nm by using an erbium-doped fibre with a relative refractive index difference as high as 1.67%, a low intrinsic loss, and an erbium ion concentration of 210 p.p.m. The gains at 1.552 mu m reach 25 and 30 dB for launched pump powers of 30 and 40 mW, respectively.
Keywords :
erbium; fibre lasers; optical losses; optical pumping; 1.534 micron; 1.552 micron; 25 dB; 30 dB; 30 mW; 40 mW; 820 nm; fibre amplifier; launched pump powers; low intrinsic loss; pumping wavelength; relative refractive index difference;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19901253
