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Proceedings Paper

(6+1) ×1 Fiber Combiner based on Thermally Expanded Core Technique for High Power Amplifiers
Author(s): Ke Zhao; Zilun Chen; Xuanfeng Zhou; Zefeng Wang; Houman Jiang
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Paper Abstract

A high-efficiency pump-signal combiner for high power fiber amplifiers based on thermally expanded core (TEC) technique is reported in this paper. TEC technique is used to fabricate mode-field adapter which allows optimization of signal fibers in a monolithic (6+1) ×1 fiber combiner. The combiner is fabricated by connecting a tapered fiber bundle (TFB) to a passive 25/250 (NA=0.06/0.46) double-clad fiber (DCF). By this method, the coupling efficiency of SMF-28 signal fiber at 1064nm improves from 54% to 92.7%. The average pump coupling efficiencies of six 105/125 (NA=0.15) fibers are measured to be 96.7% at 976nm. Furthermore, the average signal transmission efficiency is around 93.3%. The fabricated fiber combiner is spliced to an Yb-doped DCF for use as an all-fiber amplifier. The slope efficiency is measured to be 71.6%.

Paper Details

Date Published: 14 July 2015
PDF: 8 pages
Proc. SPIE 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers, 953211 (14 July 2015); doi: 10.1117/12.2185278
Show Author Affiliations
Ke Zhao, National Univ. of Defense Technology (China)
Zilun Chen, National Univ. of Defense Technology (China)
Xuanfeng Zhou, National Univ. of Defense Technology (China)
Zefeng Wang, National Univ. of Defense Technology (China)
Houman Jiang, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 9532:
Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph; Meiping Zhu, Editor(s)

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