Author:
Shi Yihuan,Kang Qi,Wen Qiao,Huang Dongmei,Wai P. K. A.
Abstract
The double-pass configuration of the erbium-doped ZBLAN fiber amplifier is achieved for the first time. The amplification efficiency is ~40% higher than that of the single-pass amplifier, which is significant for compact mid-infrared fiber amplifiers.