Efficient modulation formats for higher bit rates fiber transmission

The study of advanced modulation formats for high speed internet services using potentially the bandwidth of single mode embedded fiber is very important. Basically, the use of RZ format is considered in order to reduce the inter-symbol interference (ISI) caused mainly by effects such as Chromatic Dispersion (CD), Polarization Mode Dispersion (PMD) and Nonlinear effects. The comparative analysis among the RZ and NRZ formats is carried out by means of the obtaining different spectrums.

[1]  M. I. Hayee,et al.  NRZ versus RZ in 10-40-Gb/s dispersion-managed WDM transmission systems , 1999, IEEE Photonics Technology Letters.

[2]  Akira Naka,et al.  High-Speed TDM–WDM Techniques for Long-Haul Submarine Optical Amplifier Systems , 1997 .

[3]  G. Mohs,et al.  Advantages of nonlinear RZ over NRZ on 10 Gb/s single-span links , 2000, Optical Fiber Communication Conference. Technical Digest Postconference Edition. Trends in Optics and Photonics Vol.37 (IEEE Cat. No. 00CH37079).

[4]  A. Hodzic,et al.  Alternative modulation formats in N/spl times/40 Gb/s WDM standard fiber RZ-transmission systems , 2002 .

[5]  Hideo Kuwahara,et al.  Optimal 40 Gb/s modulation formats for spectrally efficient long-haul DWDM systems , 2002 .

[6]  A. Gnauck,et al.  Dispersion compensation for optical fiber systems , 1995 .

[7]  Masatoyo Sumida,et al.  System performance evaluation of the FSA submarine optical amplifier system , 1996 .

[8]  T. Chikama,et al.  128-Gbit/s WDM transmission of 24 5.3-Gbit/s RZ signals over 7828 km using gain equalization to compensate for asymmetry in EDFA gain characteristics , 1997, Proceedings of Optical Fiber Communication Conference (.

[9]  M. Murakami,et al.  Transoceanic twelve 10 Gbit/s WDM signal transmission experiment with individual channel dispersion-and-gain compensation and prechirped RZ pulse format , 1997 .

[10]  M. Murakami,et al.  Optimization of signal pulse duty factor in long-distance optical amplifier systems , 1998, IEEE Photonics Technology Letters.