Density and Guard Band in Migration Scenarios to Coherent Ultra-Dense WDM
; Neves, D.
Density and Guard Band in Migration Scenarios to Coherent Ultra-Dense WDM, Proc IEEE Global Communications Conference - GLOBECOM, Houston, United States, Vol. 54, pp. 1 - 5, December, 2011.
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In this work the maximum density is numerically investigated giving the compromise of physical impairments and spectral efficiency on coherent ultra-dense wavelength division multiplexing passive optical networks (UDWDM-PON). The required guard band to legacy 1.25-2.5 Gb/s intensity modulation direct detection (IMDD) systems specified closely to Gigabit- capable PON equipments is also analyzed in order to mitigate linear and nonlinear crosstalk. Using 3 GHz frequency grid guaranteed the best performance of the system (32x1.25 Gb/s quadrature phase-shift keying with coherent detection) with respect to the 10% Error Vector Magnitude limit; 12.5 GHz guard band to legacy IMDD system was sufficient to minimize strong linear and nonlinear crosstalk (mostly four-wave mixing) on both systems.