Abstract
Abstract In this paper, a 340-Gb/s polarization shift keying-dual polarized-differential quadrature phase shift keying (PolSK-DP-DQPSK) orthogonal modulation for next generation high-capacity optical transmission systems has been proposed. The NRZ-PolSK and DP-DQPSK are considered to investigate the performance for higher order optical modulation in 50 GHz spaced wavelength division multiplexing (WDM) optical network. In the system architecture, eight 340-Gb/s PolSK-DP-DQPSK orthogonal modulated WDM channels have been transmitted over 1000 km of SMF + DCF. The influence of different network parameters such as input power, channel spacing, transmission distance etc. are considered to analyze the performance of orthogonal modulated signals in WDM optical network. This new modulation scheme has high spectral efficiency and very low phase noise in WDM optical network. The WDM system achieved the spectral efficiency of 6.8b/s/Hz for the 400 GHz bandwidth. Further, increase in the spectral efficiency represents the most attractive approach in the transport capacity of future long-haul optical transmission systems.
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