Joint work with Tian-Shiang Yang, Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 701 and Stephen G. Evangelides Jr., Tyco Submarine Systems Ltd. Laboratories, 101 Crawfords Corner Road, Holmdel, NJ 07733
We present a reduced model that describes the propagation of dispersion-managed return-to-zero (RZ) pulses in an optical fiber and use it to analyze the performance of different channels in a wavelength-division-multiplexed system. Of particular interest is the goal of finding system configurations that produce output pulses with minimum temporal and spectral widths across a practical wavelength range (1540-1560 nm); this yields reduced crosstalk at the receiver, allowing greater spectral efficiency. We also discuss the relative merits of prechirping input pulses with an external modulator versus re-compressing output pulses using post-transmission dispersion compensation. The reduced model is used to identify optimal configurations, and for these specific cases the results of the reduced model are compared with full numerical simulations and found to be in good agreement.