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

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3 Author(s)
Thirstrup, C. ; Mikroelektronik Centre, Tech. Univ. Denmark, Lyngby, Denmark ; Yuan Shi ; Palsdottir, B.

A novel measurement system provides determination of pump induced phase shifts in erbium doped fibers with an accuracy of ~π/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 4 I15/2 states and 4I13/2 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

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Lightwave Technology, Journal of  (Volume:14 ,  Issue: 5 )