Single-channel optical transmission at 10 Gbit/s up to 253 km of standard singlemode fibre (SMF) has been demonstrated, using the method of dispersion supported transmission (DST) [1]. However, in a recent DST experiment at 20 Gbit/s, the link length was reduced to 53 km SMF [2], as expected from the principle of dispersion supported transmission [1]. One solution for high capacity DST on long spans of SMF is the optical transmission of wavelength division multiplexed (WDM) 10 Gbit/s channels. In [3], we have discussed the impact of single and double cavity Fabry-Perot demultiplexers on the performance of dispersion supported transmission of two WDM 10Gbit/s channels separated 1nm. Nevertheless, to reduce the differences on the system performance due to a different value of fibre dispersion at the wavelength assigned to each channel, narrow channel spacings are required.
Abstract. This paper discusses the impact of double cavity Fabry-Perot demultiplexers on the performance of wavelength division multiplexing (WDM) systems with dispersion supported transmission (DST) of three I0 Gbitls channels separated 1 nm.For performance assessment, a suitable simulation methodology has been used which combines signal simulation with noise analysis in optically amplified multichannel direct detection systems. Simulation results show an improved system performance if a double cavity Fabry-Perot filter is used as demultiplexer, resulting in WDM transmission with a crosstalk penalty less than 1 dB in the region of small linear increase of dispersion penalty of the DST method. The robustness of the multichannel DST method against data pattern dependencies is investigated.
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