Shaoliang Zhang, F. Yaman, Lei Xu, Y. Shao, M. Cvijetic
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A novel approach to generate quadrature duobinary (QDB) format with return-to-zero (RZ) carving is proposed. RZ pulse shaping would give 2 dB fiber nonlinearity tolerance over non-return-to-zero (NRZ) QDB while keeping a similar filtering tolerance.