Detailed dynamic model for semiconductor optical amplifiers and their crosstalk and intermodulation distortion

Terji Durhuus, Benny Mikkelsen, Kristian Stubkjær

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An advanced dynamic model for multisection semiconductor optical amplifiers is presented. It accounts for the carrier and field distributions in the longitudinal direction as well as for the facet reflectivities. The model can handle arbitrary time-varying input signals and current modulations. The model is used to assess intermodulation distortion and crosstalk. Cascaded amplifiers are considered, and the crosstalk and intermodulation distortion due to cascaded amplifiers are found to accumulate by adding together in amplitude; this may limit the number or cascaded amplifiers in multichannel systems. Carrier-induced nonlinearities depend strongly on facet reflectivities; for 25 dB of single-pass gain, a reflectivity of 5×10-4 will result in 3 dB excess distortion. Reduction of intermodulation distortion by use of multisection amplifiers is found to be possible only for small channel separations (
Original languageEnglish
JournalJournal of Lightwave Technology
Issue number8
Pages (from-to)1056-1065
Publication statusPublished - 1992

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