Limitation of Group Refractive Index in An Optical Fiber at The Room Temperature

被引：0
作者：
Qiu W. [1 ]
Gao B. [2 ]
Liu J.-J. [1 ]
Wang Y.-D. [1 ]
Lyu P. [1 ]
Jiang Q.-L. [1 ]
机构：
[1] Department of Physics, Liaoning University, Shenyang
[2] Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing
来源：
Faguang Xuebao | / 3卷 / 380-386期
基金：
中国国家自然科学基金;
关键词：
Group refractive index; Optical fiber; Slow light;
D O I：
10.3788/fgxb20173803.0380
中图分类号：
学科分类号：
摘要：
The electron population oscillating between the ground and metastable level in the beat frequency between the pump and probe beam can result in the reduced absorption of the probe wave. The probe wave experiences the reduction of absorption in a narrow frequency band, which corresponds to rapid changes of the refractive index. According to the equation of ng=n(ω)+ωdn/dω, the group refractive index will increase. Utilizing the theory of slow light, the limitation of group refractive index in different environments and the change of group velocity were discussed. It is found that the group refractive index decreases with the increasing of the fiber length. The group refractive indices in the fibers with different Er3+ concentration decrease with the increasing of the modulation frequency, and the group refractive index has a saturation process with the increasing of the signal power under different modulation frequency. © 2017, Science Press. All right reserved.
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页码：380 / 386
页数：6
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