STRAIGHT-LINE EXPERIMENT AND NUMERICAL-SIMULATION FOR RZ SIGNAL LONG-DISTANCE TRANSMISSION WITH PERIODIC DISPERSION COMPENSATION

RZ signal transmission in an anomalous region with periodic dispersion compensation is examined by a straight-line experiment in terms of th e compensation ratio, the signal power, and the pulse width. The optim um condition enables single-channel 20-Gbit/s RZ signal and two-WDM-ch annel 20-Gbit/s signals (40-Gbit/s in total) to he transmitted over 5, 520 km and 2,160 km, respectively. Numerical simulations a with the as sistance of a basic theory enables analysis of the experimental result s. It is shown that the balance between the waveform distortion and th e remaining Gordon-Haus jitter determines the optimum conditions to ac hieve the longest transmission distance. Excess dispersion compensatio n results in waveform distortion, while insufficient compensation caus es a greater amount of remaining jitter. Moreover, spectrum deformatio n during propagation is experimentally and numerically clarified to ha ve a large effect on the transmission performance, especially for WDM transmission.