Article

# Numerical simulation of the SPM penalty in a 10-Gb/s RZ-DPSK system

Bell Labs., Murray Hill, NJ, USA

IEEE Photonics Technology Letters (Impact Factor: 2.04). 12/2003; DOI: 10.1109/LPT.2003.818664 Source: IEEE Xplore

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**ABSTRACT:**The influence of chromatic dispersion, optical power, and nonlinear distortions in a fibre-optic communication system on the quality of data transmission based on nonreturn-to-zero differential phase-shift keying at a rate of 40 Gbit s-1 in one spectral channel have been numerically simulated and experimental studied. The results of direct numerical calculations and estimates based on the quality factor (Q factor) are in qualitative agreement with the experimental data. It is found experimentally that the dependence of the error rate on the accumulated dispersion has a plateau in the range from —50 to 50 ps nm-1; a similar dependence is obtained in the numerical calculation based on the Q factor. The optimal calculated value of the power launched into each of 10 sections of a line with a total length of 1000 km is 2 — 4 dBm; it corresponds to the experimental value of 3 dBm.Quantum Electronics 10/2011; 41(10):929-933. · 0.82 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**The performance evaluation of optical differential quadrature phase-shift keying (DQPSK) systems through numerical simulation using a Gaussian approach (GA) for the equivalent differential phase (EDP) statistics is analyzed. It is shown that the GA describes quite accurately the probability density function (PDF) of EDP for a large range of DQPSK receiver (RX) imperfections. A semi-analytical simulation method (SASM) for bit error probability (BEP) evaluation based on the GA for the EDP is derived, proving to be quite accurate in presence of RX imperfections. The SASM takes into account the signal-noise beat variance dependence on signal waveform distortion and arbitrary optical and electrical filtering frequency responses. Closed-form expressions for the mean and standard deviation of EDP are derived which allows evaluating the DQPSK system performance in a quite time-efficient manner. Discrepancies not exceeding 0.1 dB on the optical SNR penalty estimated by the SASM for a BEP of 10-4 when compared with Monte Carlo simulation are observed for the majority of the acceptable RX imperfections. Only the time-misalignment of the signals at the balanced detector input leads to higher discrepancies but not exceeding 0.3 dB even for considerable time-misalignment.Journal of Lightwave Technology 01/2010; 28(12):1735-1744. · 2.56 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**Combined effects of the dispersion map and the fiber nonlinearity in the long-haul transmission system based on the PSK format are discussed. Studies show that the conventional block type dispersion map is not optimum for the RZ-DPSK based long-haul system. Bit-rate dependent system behavior is also discussed.01/2010;

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