Abstract
An accurate evaluation of the bit error rate (BER) is a fundamental issue in the design of most optical fibre- communication systems. In dispersion-managed systems operating at high channel rates (40 Gbit/s and more), carrier pulses exhibit substantial dispersion broadening and, as a result, many bits overlap during transmission. The overlapping leads to interactions of carrier pulses distant from each other while in transit, and, consequently, to intersymbol interference and patterning effects. In this paper we present an important new example of a system with strong and nontrivial patterning effects. There has been much interest lately in the implementation of the differential Phase Shift-Keying (PSK) modulation format for long-haul and ultra long-haul fibre communications and, in particular, the Differential Binary PSK (DBPSK) modulation format, where data is encoded into the optical phase (see e.g. [1] and references therein). Here we present the results of a direct computation of the error statistics for an SMF/DCF RZ- DBPSK 5-channel WDM RZ-DBPSK link with hybrid Raman/EDFA amplification at 40 Gbit/s per channel, with a channel separation of 100 GHz. We obtain the statistics of bit triplets and quantify strong pattern-dependent 1ST We also demonstrate how system performance can be improved by source pre-encoding.
© 2007 IEEE
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