As is well known, chromatic dispersion (CD) and nonlinear effect such as self-phase modulation (SPM),
cross-phase-modulation (XPM), and four-wave-mixing (FWM), as well as their impairments interaction
with each other are recognized as a limiting impairment for a high bit rates optical systems. With the advent
of the 40 Gb/s, it is necessary to study transmission performance, which clearly depends on the modulation
format and the system design.
A numerical comparison of non-return-to-zero (NRZ), return-to-zero (RZ) and differential phase shift
keying (DPSK) formats is made at a bit rate of 40 Gbit/s for single-channel and WDM systems with
different compensation method in attempt to find the optimum modulation format. The transmitter under
consideration used a 1.5 um DFB-laser externally modulated by a MZM modulator with modulation format
(NRZ, RZ, DPSK), 64 PRBS data. At the receiver end an optical filtering using gaussian, fabry-perot and
rectangular filter is used. Between the compensation method the symmetrical design leaves the best results
in comparison to pre- and post-compensation. The impact of SPM can be reduced considerably by the
symmetrical design. NRZ shows a best toleranz again chromatic dispersion and DPSK a best toleranz to
Nonlinearity.
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