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  • CLEO/Europe and IQEC 2007 Conference Digest
  • (Optica Publishing Group, 2007),
  • paper CI8_4

Transmission Impairments for 298.2Gbit/s Coherent WDM over 600km of Standard Single Mode Fibre

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Abstract

Coherent Wavelength Division Multiplexing (CoWDM) is a promising technique in order to achieve, in a simple and cost-effective configuration, high information spectral densities (ISD) [1], In this paper, we estimate, for the first time, the impact of non-linear effects (NLE) and polarisation mode dispersion (PMD) for a CoWDM system using standard single-mode fibre (SSMF), showing that this high ISD system offers similar total reach to a standard WDM system with 42.6Gbit/s NRZ channels. We considered firstly the impact of noise and NLE on a 298.2Gbit/s CoWDM system generated from seven 42.6Gbit/s random data streams (512 and 27-l bits for simulated and experimental results respectively). Figure la, plots the simulated Q-factor of the worst tributary for each input power and the backscattered power due to stimulated Brillouin scattering (SBS). After transmission over 40 km of SSMF and corresponding dispersion compensating fibre (DCF) (closed triangles), the performance is degraded when the total launched power is above 10.4dBm due to the onset of SBS (open triangles), where a clear threshold occurs at approximately the same power level. Experimentally, at a launched power of 12dBm, SBS is clearly present (figure lb).

© 2007 IEEE

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