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Improvement of dispersion tolerance using phase-Modulated NRZ signals in 40-gb/s transmission systems

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6 Author(s)
Xin Chen ; Dept. of Electron. Eng., Tsinghua Univ., Beijing, China ; Bingkun Zhou ; Hanyi Zhang ; Xiaohong Ma
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Compared with the conventional nonreturn-to-zero (NRZ), return-to-zero (RZ), carrier-suppressed return-to-zero, and chirped RZ signals by numerical simulation, a higher dispersion tolerance in the presence of fiber nonlinearities and amplifier noise has been obtained in this letter by using the phase-modulated NRZ signals. This scheme aims to improve resistance to residual dispersion by an adapted phase modulation at the transmitter.

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Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 1 )