Modification of Level Dependent ASE-Signal Beat Noise by Optical and Electrical Filtering in Optically Preamplified Direct Detection Receivers

摘要

We derive an analytical model describing the effect of filtering on amplifiedspontaneous emission noise during or after opto-electronic conversion. Inparticular, we show that electrical filtering results in a further reduction ofthe signal quality factor associated with an effective increase of the noiselevels and can lead to counter-intuitive dependencies of the measured signalquality on the characteristics of the test setup. Closed form equations arecompared with numerical models and experiments, showing excellent agreement.