Modeling direct detection and coherent detection lightwave communication systems which utilize cascaded erbium-doped fiber amplifiers

Document Type

Conference Proceeding

Date of Original Version



A theoretical model has been applied to predict the performance of lightwave communication systems which incorporate cascaded erbium-doped fiber amplifiers (EDFAs). The model has been applied to direct, and coherent detection systems. We have used the model to predict the performance of new direct-detection system configurations, which demonstrate the limits of bandwidth x length products which can be obtained in future experimental systems. We have carried out a sensitivity analysis of direct and coherent lightwave communication systems, incorporating EDFAs, to variations in critical system parameters. These include: optical bandwidth, electrical bandwidth, bit-rate, spontaneous emission factor, fiber chromatic dispersion, number of cascaded EDFAs, splice efficiency, and source laser linewidth. We have also developed a model for a direct-detection system which uses distributed erbium-doped fiber amplifiers (DEDFAs), and used the model to predict the performance of such a system. Results indicate that a high Signal-to-Noise Ratio (SNR) ratio can be maintained throughout the system if the gain per unit length is held at a fairly low level. Compared with a 'lumped' amplifier approach, we find that the distributed fiber amplifier approach yields a 14 dB improvement in SNR.

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering



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