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We propose offset-QAM based CoWDM, and show that the proposed system outperforms no-guard-interval optical OFDM and Nyquist WDM and enables the use of offset 4-, 16-, and 64-QAM with the performance approaching the theoretical limits.
In this paper, we review emerging technologies to build up Tb/s per channel transmission capacity. The different approaches, mainly based on various implementations of orthogonal frequency division multiplexing, Nyquist wavelength division multiplexing and optical time division multiplexing, are introduced and compared with respect to complexity, spectral efficiency and transmission reach. In addition...
Future optical networks will require the implementation of very high capacity (and therefore spectral efficient) technologies. Multi-carrier systems, such as Orthogonal Frequency Division Multiplexing (OFDM) and Coherent WDM (CoWDM), are promising candidates. In this paper, we present analytical, numerical, and experimental investigations of the impact of the relative phases between optical subcarriers...
In this paper a practical implementation of a CoWDM system using injection locked lasers and a DPSK modulator array is demonstrated. This scheme is suitable for multi-carrier transmission systems in high capacity optical networks.
In this presentation we will discuss recent advances in adaptive modulation schemes for ultra high bit capacity optical networks. This paper focuses on optimising the sub-carrier spacing for such high capacity networks.
In this paper we investigate the non-linear transmission performance of 40 Gsymbol/s multi-carrier techniques, specifically coherent WDM (CoWDM) for a variety of existing dispersion maps. Whilst the simulations on this paper were performed using NRZ OOK CoWDM implementation, the conclusions are also applicable to other multi-carrier techniques, such as OFDM.
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