7 December 2016 Investigation on high transmission efficiency 7 × 1 pump combiner
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The 7×1 end-pumped combiner employing 105/125  μm multimode fibers as pump fibers is investigated. The theoretical analysis reveals that sufficient taper length and low refractive index of the capillary should be adopted to fabricate high transmission efficiency combiners. Based on the simulation results, we fabricate a 7×1 end-pumped pump combiner with an average transmission efficiency of 98.9% and a total return loss of 1.1‰. The measured internal operating temperature of this combiner indicates it can endure pump power of the order of kilowatts.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yang Cao, Wei Shi, Quan Sheng, Shijie Fu, Haiwei Zhang, Xiaolei Bai, Liang Qi, Jianquan Yao, "Investigation on high transmission efficiency 7 × 1 pump combiner," Optical Engineering 55(12), 126102 (7 December 2016). https://doi.org/10.1117/1.OE.55.12.126102 . Submission:

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