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Spectral Efficiency Enhancement Using Coherent WDM with Multi-Level Offset-QAM

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Abstract

We propose offset-QAM based CoWDM, and show that the proposed system outperforms no-guard-interval optical OFDM and Nyquist WDM and enables the use of offset 4-, 16-, and 64-QAM with the performance approaching the theoretical limits.

© 2011 Optical Society of America

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