Highly efficient Er–Yb codoped double-clad fiber amplifier with an Yb-band resonant cavity. (10th January 2017)

• Record Type: Journal Article
• Authors: Han, Qun; Yao, Yunzhi; Tang, Xiaoyun; Chen, Yaofei; Yan, Wenchuan; Liu, Tiegen; Song, Huiling
• Is Part Of: Laser physics letters. Volume 14:Number 2(2017:Feb.)
• Publication Date: 2017-01-10
• Subjects: fiber amplifiers -- amplified spontaneous emission -- erbium -- ytterbium -- fiber lasers; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/aa568f
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: A high-power Er–Yb codoped fiber amplifier (EYDFA) with an Yb-band resonant cavity is investigated. By introducing a linear resonant cavity formed by a pair of high-reflection double-clad fiber Bragg gratings, the Yb-ASE problem of high-power pumped EYDFAs can be resolved and the efficiency of the amplifier can be notably improved. At a pump power of ~17 W, an output power of 7.25 W was experimentally achieved. The pump conversion efficiency and slope efficiency relative to the applied pump power are ~42.6% and ~45.6%, respectively. Moreover, due to the gain-clamping effect of the Yb cavity, the gain flatness of the amplifier is also evidently improved.