Journal article
Detailed dynamic model for semiconductor optical amplifiers and their crosstalk and intermodulation distortion
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 (
| Language: | English |
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| Publisher: | IEEE |
| Year: | 1992 |
| Pages: | 1056-1065 |
| ISSN: | 15582213 and 07338724 |
| Types: | Journal article |
| DOI: | 10.1109/50.156845 |
Charge carrier density Intermodulation distortion Numerical models Optical amplifiers Optical bistability Optical crosstalk Optical distortion Reflectivity Semiconductor optical amplifiers Stimulated emission cascaded amplifiers crosstalk current modulations dynamic model excess distortion facet reflectivities field distributions frequency division multiplexing intermodulation intermodulation distortion longitudinal direction multichannel systems multisection amplifiers optical communication equipment optical modulation random-phase optical carriers semiconductor junction lasers semiconductor optical amplifiers single-pass gain time-varying input signals
