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Concentration-dependent upconversion in Er/sup 3+/-doped fiber amplifiers: Experiments and modeling

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4 Author(s)
Blixt, P. ; Dept. of Phys. II, R. Inst. of Technol., Stockholm, Sweden ; Nilsson, J. ; Carlnas, T. ; Jaskorzynska, B.

Eight different fibers were studied to examine upconversion as a function of erbium concentration below 1000 ppm by weight. These experiments and a computer model of two-particle upconversion made it possible to estimate the upconversion coefficient used in a rate-equation model. A strong correlation was found between amplification reduction and parasitic upconversion in fibers with both Ge- and Ge/Al/P-cores when the erbium-doping concentration is in the range 70-840 ppm by weight. When plotting maximum amplification versus the 980 luminescence on a logarithmic scale, the slope was approximately -2 irrespective of the host material. The validity of the assumed two-particle upconversion model up to 4 mW of pump power is shown.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:3 ,  Issue: 11 )