Article
Numerical simulation of the SPM penalty in a 10Gb/s RZDPSK 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

Article: Modeling nonlinear phase noise in differentially phasemodulated optical communication systems.
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ABSTRACT: Using an alternative approach for evaluating the BitError Rate (BER), we present a numerical and experimental investigation of the performance of phasemodulated optical communication systems in the presence of nonlinear phase noise and dispersion. The numerical method is based on the well known KarhunenLo;eve expansion combined with a linearization technique of the Nonlinear Schr odinger Equation (NLSE) to account for the nonlinear interaction between signal and noise. Our numerical results show a good agreement with experiments.Optics Express 04/2009; 17(5):322641. · 3.55 Impact Factor  [show abstract] [hide abstract]
ABSTRACT: We describe a new method for quantitative evaluation of the quality of multilevel differential phaseshiftkeyed (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 biterror 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 8ary PSK signals.IEEE Photonics Technology Letters 10/2009; · 2.04 Impact Factor  [show abstract] [hide abstract]
ABSTRACT: We develop a novel phasor monitor to obtain the constellation diagram from asynchronously sampled data measured by using the delaydetection technique. This phasor monitor consists of three parts; a phaseadjustmentfree delayinterferometer, an optical frontend made of three photodetectors, and analogtodigital (A/D) convertors, and a digital signal processor. We operate the A/D convertor at the sampling rate much slower than the symbol rate and acquire the data asynchronously. However, despite the use of such a slow and asynchronous sampling rate, we obtain the clear eye and constellation diagrams by utilizing the softwarebased synchronization technique based on a novel phasedreference detection algorithm. Thus, the proposed phasor monitor can be implemented without using highspeed A/D convertors and buffer memories, which have been the major obstacles for the costeffective realization of the phasor monitor. For a demonstration, we realize the proposed phasor monitor by using an A/D converter operating at 9.77 MS/s and used it for the constellation monitoring and biterrorrate (BER) estimation of 10.7Gsymbol/s differential quadrature phaseshift keying (DQPSK) and differential 8ary phaseshift keying (D8PSK) signals.Optics Express 10/2010; 18(21):215118. · 3.55 Impact Factor
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