10 Gbit/s four-channel wavelength- and polarisation-divisionmultiplexing transmission over 340 kmwith 0.5 nm channel spacing

Abstract

The authors propose a novel WDM transmission technique combined with polarisation-division multiplexing (PDM) which doubles the frequency utilisation efficiency. This technique is used to transmit a 10 Gbit/s four-channel WDM signal with 0.5 nm channel spacing over 340 km and the signal is demultiplexed using an optical filter having 0.5 nm FWHM and a polarisation beamsplitter.