Abstract

The authors compare analytical and numerical estimates, showing that the nonlinear phase noise of short optical pulses associated with the coupling between amplified spontaneous emission noise and fiber nonlinearity may be controlled by adjusting the duty cycle of the return-to-zero (RZ) signal modulation format. The impact of this effect in the optimization of the performance of 10-Gb/s dispersion-managed wavelength division multiplexed (WDM) systems using RZ-differential phase-shift keying (DPSK) modulation is discussed. By extensive numerical simulations, it is shown that the transmission quality of ultradense WDM systems using the RZ-DPSK modulation format may be significantly enhanced by optimizing the duty cycle of the RZ pulses.

© 2006 IEEE

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IEEE Photon. Technol. Lett.

J.-K. Rhee, D. Chowdhury, K. S. Cheng, U. Gliese, "DPSK 32 $\times$ 10 Gb/s Transmission modeling on 5 $\times$ 90 km terrestrial system," IEEE Photon. Technol. Lett. 12, 1627-1629 (2000).

H. Kim, A. H. Gnauk, "Experimental investigation of the performance limitation of DPSK systems due to nonlinear phase noise," IEEE Photon. Technol. Lett. 15, 320-322 (2003).

X. Wei, X. Liu, C. Xu, "Numerical simulation of the SPM penalty in a 10-Gb/s RZ-DPSK system," IEEE Photon. Technol. Lett. 15, 1636-1638 (2003).

C. Xu, X. Liu, L. F. Mollenauer, X. Wei, "Comparison of return-to-zero differential phase-shift keying and ON–OFF keying in long-haul dispersion managed transmission," IEEE Photon. Technol. Lett. 15, 617-619 (2003).

H. Maeda, M. Murakami, N. Ohkawa, T. Imai, "Optimization of signal pulse duty factor in long-distance optical amplifier systems," IEEE Photon. Technol. Lett. 10, 1183-1185 (1998).

T. Inoue, H. Sugahara, A. Maruta, Y. Kodama, "Interactions between dispersion managed solitons in optical-time-division-multiplexed systems," IEEE Photon. Technol. Lett. 12, 299-301 (2000).

J. Lightw. Technol.

T. Mizuochi, K. Ishida, T. Kobayashi, J. Abe, K. Kinjo, K. Motoshima, K. Kasahara, "A comparative study of DPSK and OOK WDM transmission over transoceanic distances and their performance degradations due to nonlinear phase noise," J. Lightw. Technol. 21, 1933-1943 (2003).

Opt. Lett.

Other

A. H. Gnauk, G. Raybon, S. Chandrasekhar, J. Leuthold, C. Doerr, L. Stulz, A. Agarwal, S. Banerjee, D. Grosz, S. Hunsche, A. Kung, A. Marhelyuk, D. Maywar, M. Movassaghi, X. Liu, C. Xu, X. Wei, D. M. Gill, "2.5 Tb/s (64 $\times$ 42.7 Gb/s) transmission over 40 $\times$ 100 km NZDSF using RZ-DPSK format and all-Raman-amplified spans," Proc. OFC (2002) pp. FC2-1-FC2-3.

X. Liu, C. Xu, X. Wei, "Nonlinear phase noise in pulse-overlapped transmission based on return-to-zero differential phase-shift-keying," Eur. Conf. Optical Commun. (ECOC) CopenhagenDenmark (2002) Paper 9.6.5.

A. Tonello, S. Wabnitz, O. Boyraz, "Duty ratio control of nonlinear phase noise in dispersion managed WDM systems using RZ-DPSK modulation," Optical Fiber Commun. Conf. (OFC) AnaheimCA (2005) Paper OME55.

D. Kovsh, E. A. Golovchenko, A. N. Pilipetskii, "Enhancement in performance of long-haul DWDM systems via optimization of the transmission format," Proc. Optical Fiber Commun. (OFC) (2002).

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