Title :
Improvement of dispersion tolerance using phase-Modulated NRZ signals in 40-gb/s transmission systems
Author :
Chen, Xin ; Zhou, Bingkun ; Zhang, Hanyi ; Ma, Xiaohong ; Zheng, Xiaoping ; Guo, Yili
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
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.
Keywords :
laser noise; nonlinear optics; optical fibre amplifiers; optical fibre communication; optical fibre dispersion; optical modulation; optical transmitters; phase modulation; wavelength division multiplexing; 40 Gbit/s; Gb/s transmission systems; NRZ signals; WDM systems; adapted phase modulation; amplifier noise; carrier-suppressed return-to-zero signal; chirped RZ signal; conventional nonreturn-to-zero signal; dispersion tolerance; fiber nonlinearities; optical transmitter; phase-modulated signals; residual dispersion resistance; return-to-zero signal; Chirp; Optical fiber communication; Optical fiber dispersion; Optical pulses; Optical signal processing; Optical transmitters; Phase modulation; Phase noise; Pulse modulation; Wavelength division multiplexing; Chromatic dispersion; fiber nonlinearities; modulation format; optical fiber communication; phase modulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.859988
