Pump-induced refractive index modulation and dispersions in Er3+-doped fibers

被引:38
作者
Thirstrup, C
Shi, Y
Palsdottir, B
机构
[1] RIKEN, SURFACE & INTERFACE LAB, SAITAMA, JAPAN
[2] E TEK DYNAM INC, SAN JOSE, CA 95131 USA
[3] LYCOM AS, DK-2605 BRONDBY, DENMARK
关键词
D O I
10.1109/50.495152
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A novel measurement system provides determination of pump induced phase shifts in erbium doped fibers with an accuracy of similar to pi/20. Using this system, a systematical analysis of the pump induced modulation of the refractive index and dispersions for a signal at 1550 nm and a pump at 980 nm is reported. The analysis contains measurements of pump induced refractive index changes as function of wavelength, pump power, and doping concentration. A model taking account of the contribution to the refractive index changes from optical transitions between I-4(15)/(2) states and I-4(13/2) states in Er3+ yields good agreement to experimental results apart from a wavelength independent offset. The offset is interpreted to originate from high energetic optical transitions. The results show that for a large refractive index modulation, a short and highly doped fiber should be used with limited amplified spontaneous emission effect. In optical communication systems comprising erbium doped fiber amplifiers, a tradeoff between dispersion and amplification must be made.
引用
收藏
页码:732 / 738
页数:7
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