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Optical amplification in thin optical waveguides with high Er concentration

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3 Author(s)
Federighi, Marco ; Dept. of Electr. & Electron. Eng., Univ. Coll. London, UK ; Massarek, I. ; Trwoga, P.F.

The fabrication of compact active optical waveguides requires high concentrations of rare-earth ions. In highly doped materials the optical gain is affected by cross-relaxation and up-conversion processes. By solving the rate equations for the levels involved in radiative transitions, the optical gain is obtained as a function of the dopant concentration in the case of Er-doped silica pumped at 980 nm. The performance of channel waveguides from the same material is analyzed; in particular, the dependence on Er concentration of threshold pump power and amplifier gain is discussed.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:5 ,  Issue: 2 )