Abstract
We investigated a cost-effective method using 10-Gb/s LiNbO<sub>3</sub> Mach–Zehnder Modulators (MZMs) for transmitting 40-Gb/s duobinary nonreturn-to-zero (NRZ) and
duobinary carrier-suppressed return-to-zero (DCS-RZ) signals. The transmission performance of the signals was
investigated. The optimum bandwidths of low-pass filters in transmitters using 10- and 40-Gb/s LiNbO<sub>3</sub> MZMs were also investigated. The calculated
transmission performance of the transmitter using 10-Gb/s LiNbO<sub>3</sub> MZMs was compared to that using 40-Gb/s LiNbO<sub>3</sub> MZMs. The effect of the bias offset in the transmitters was investigated. Compared to duobinary-NRZ and DCS-RZ signals generated by a transmitter using 40-Gb/s LiNbO<sub>3</sub> MZMs, those generated by using 10-Gb/s LiNbO<sub>3</sub> MZMs can be transmitted with 1-dB power penalty over 480-km transmission.
© 2007 IEEE
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