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

Cornell University, Итак, New York, United States
IEEE Photonics Technology Letters (Impact Factor: 2.11). 12/2003; 15(11):1636 - 1638. DOI: 10.1109/LPT.2003.818664
Source: IEEE Xplore


The impact of self-phase modulation-induced nonlinear phase noise in a 10-Gb/s return-to-zero differential phase-shift keying system is studied by numerical simulation. We show that the simple differential phase Q method based on the Gaussian approximation for the phase noise provides a relatively good estimate of the nonlinear penalty.

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Available from: Xiang Liu, Dec 03, 2013
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    • "Thus, we should be able to estimate the BER of the DxPSK signal simply by using the Gaussian approximation (as in the on–off keying signal). For this purpose, we defined the -factor for -ary DxPSK signal by [9]. Then, we estimated the BERs of DQPSK and D8PSK signals by BER erfc and BER erfc , respectively, using the Gaussian approximation. "
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    ABSTRACT: We describe a new method for quantitative evaluation of the quality of multilevel differential phase-shift-keyed (DxPSK) signals by using a differential phasor monitor. This method measures the phase deviation of the symbols in the differential phasor diagram and estimates the bit-error rate (BER) by using a simple relation based on the Q -factor defined for multilevel DxPSK signals. We demonstrate that the proposed method can accurately estimate the BER of differential quadrature PSK and 8-ary PSK signals.
    IEEE Photonics Technology Letters 10/2009; 21(18-21):1305 - 1307. DOI:10.1109/LPT.2009.2025869 · 2.11 Impact Factor
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    • "Over a realistic fiber optic link, it has been shown that the total linear and nonlinear phase noise has a nearly Gaussian distribution [12]. Extending the Gaussian approximation to laser-induced phase noise [13], a simple analytic model is derived for -ary DPSK detection, with -factor of the total demodulated Gaussian noisy angle given by (1) where is the phase offset between the two DLI arms, with the frequency offset away from the optimal optical carrier, is the variance of the linear and nonlinear phase noise, and the laser phase noise (LPN) variance is given in the first perturbation order by the expression Fig. 1. "
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    ABSTRACT: Multibit delay demodulation of differential-phase shift-keying (DPSK) is finding applications in polarization interleaved modulation, optical time-domain multiplexing (OTDM), and multisymbol DPSK demodulation. Little attention has been paid to the degradation in tolerance and power penalty associated with multibit delay demodulation. We assess experimentally, numerically, and analytically the power penalties and tolerances associated with multibit delay DPSK demodulation. Numerical and analytical results show that the power penalty scales by a small factor of 0.2-0.35 dB per integer bit delay due to laser linewidth (LW) while experimental back-to-back results show a significant 1.2 dB per integer bit delay due to frequency offset penalty of longer bit delays. Frequency offset tolerance scales as 1/bit-delay and the delay-mismatch tolerance decreases by 20% for delays longer than 1 bit. A simple analytic model accounts for the combined effect of LW, frequency offset, and amplified spontaneous emission.
    IEEE Photonics Technology Letters 01/2008; 19(23-19):1874 - 1876. DOI:10.1109/LPT.2007.907577 · 2.11 Impact Factor
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    • "We calculated the differential phase value [11] for a large scale of distance using a bit sequence containing 8192 bits, which gives a relatively good estimation for comparison of the two dispersion maps. The definition of the differential phase is: [11], where and represent the standard deviations of the differential phase on the 0 and rails, respectively. The results are shown in Fig. 2(b). "
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    ABSTRACT: Lumped dispersion compensation is numerically investigated for 40-Gb/s return-to-zero differential phase-shift-keying transmission. Using pseudorandom binary sequence lengths up to 2<sup>11</sup>-1, simulation results indicate that better long-distance transmission performance can be achieved using lumped dispersion compensation than using conventional periodic inline dispersion compensation. Improved performance is found to be a result of reduced nonlinear effects and the elimination of periodic accumulation of nonlinear effects. The lumped compensation scheme provides a simple, flexible, and potentially low-cost solution for transmission link design
    IEEE Photonics Technology Letters 05/2007; 19(8-19):568 - 570. DOI:10.1109/LPT.2007.894274 · 2.11 Impact Factor
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