Performance prediction for WDM PM-QPSK transmission over uncompensated links

Abstract

We derive closed-form expressions depending on a single fitting parameter for performance prediction of WDM PM-QPSK long-haul uncompensated transmission. Besides general properties, we demonstrate that nonlinear penalty is always equal to 1.76 dB.

An Alternative Approach to the Gaussian Noise Model and its System Implications

“…where ζ in = D in /D is the coordinate after which a dispersion of D in has been cumulated 3 . With the change of variables…”

“…The distinctive feature of these highly dispersive systems is a Gaussian distribution of the received sampled signal [1], [2], a consequence of the addition of very many comparable-size nonlinear field interferers from symbol times even far away from the symbol of interest. The Gaussian nature of both the nonlinear interference (NLI) and the amplified spontaneous emission noise fields brings the theory of these nonlinear optical coherent communication systems back to the standard additive Gaussian noise (GN) model of most nonoptical telecommunications literature, and allows elementary system optimization rules based on the electrical signal to noise ratio [3]- [5].…”

“…The formal elegance and simplicity of the GNRF is remarkable, but despite approximate explicit solutions exist in special cases [10], the numerical evaluation of the NLI PSD using the GNRF for a generic input PSD is still a hard task, calling for a complexity of the order of O(M 3 ), with M the number of discrete frequencies of the input PSD.…”

Analysis of Nonlinear Signal Interference to Optimize the Coherent Optical Transmission System

“…nonlinear signal propagation, the optimum OSNR is 13.77dB and 16.78dB when TX P is -2.44dBm and 0.5 dBm considering 16GBaud and 32GBaud respectively. For the result's confirmation, it is found that the optimum penalty between linear and nonlinear propagation is around 1.76dB [21]. It is also confirmed that the lines overlap for 16GBaud and 32GBaud respectively considering linear propagation.…”

Accumulation of nonlinear noise in coherent communication lines without dispersion compensation

“…This nonlinear noise can be described as a Gaussian noise [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], at least in dispersion uncompensated (DU) coherent systems. Gaussian nature of the nonlinear interference (NLI) noise fields is conditioned by Gaussian distribution of the information sampled signal [4][5][6][14][15][16].…”