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ABSTRACT: We systematically investigate the combined effect on the system performance in an optical fiber communication system of a signal that is depolarized due to polarization-mode dispersion (PMD) and noise that is partially polarized due to polarization-dependent loss. We derive a formula for the variance of the electric current of the signal due to the signal-noise beating between a depolarized signal and partially polarized noise. We validate this theoretical formula by comparing the Q -factor calculated using the theory to results obtained from Monte Carlo simulations and experiments. We show that the system performance strongly depends on the power-splitting ratio, the degree of polarization of the noise, and the angle between the states of polarization of the signal and the polarized part of the noise. Although the theoretical formula is derived assuming that the optical fiber only has first-order PMD, we show that for arbitrary fiber, this formula still produces a reliable estimate of the Q-factor provided that the second-order PMD is on the order of 300 ps<sup>2</sup> or less.
Journal of Lightwave Technology 10/2009; · 2.78 Impact Factor
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ABSTRACT: Due to the temporal drift of the fiber birefringence in an optical fiber transmission system, the polarization mode dispersion (PMD) effects measured in a time window can be quite different for different time windows of the same duration. Every 10 s for 10 days, the accumulated differential group delay (DGD) was repeatedly measured at 5000 km in a 107-km recirculating loop with loop-synchronous polarization scrambling. In each DGD measurement, the polarization dispersion vector of the 107-km-long fiber was also measured. To model the measured temporal variation of the DGD, two different perturbation algorithms were used to construct random walks through the configuration space of birefringent fibers, where each fiber realization is determined by the standard coarse-step method. With these simulation models, the statistical properties of the spread of the DGD samples over a finite time period were reproduced.
Journal of Lightwave Technology 04/2006; 24(3):1165- 1175. · 2.78 Impact Factor
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ABSTRACT: We investigate experimentally and theoretically the statistics of optical signal-to-noise ratio (OSNR) and Q-factor after 1800 km of propagation with three channel spacings in a typical terrestrial wavelength-division-multiplexing (WDM) system with a fixed loop polarization-dependent loss (PDL) level of 0.75 dB. Comparisons between measured and simulated results show that fiber drift contributes significantly to the OSNR and Q fluctuations, and decreasing channel spacing reduces the PDL-induced performance fluctuations, but increases the interchannel crosstalk-induced performance fluctuations, especially at the 50-GHz channel spacing. The combination of these factors leads to comparable performance statistics with these channel spacings.
IEEE Photonics Technology Letters 07/2005; · 2.19 Impact Factor
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ABSTRACT: Using the Jones matrix eigenanalysis and Poincare´ arc methods, we measured the differential group delay (DGD) in a recirculating loop for arbitrary fiber realizations and for different round trips. The measurement uncertainty was less than 2.0 ps in most cases. With this capability, we measured the DGD distribution with and without loop-synchronous polarization scrambling. We found that the DGD distribution can be influenced by the slow drift of fiber realization in the loop.
IEEE Photonics Technology Letters 08/2004; · 2.19 Impact Factor
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ABSTRACT: Using a recirculating loop, we measured nonlinearly induced timing jitter in a terrestrial wavelength-division-multiplexed system at different transmission distances with different amounts of precompensation. Within each 600-GHz subband, we achieved error-free transmission using the same amount of precompensation for all channels at all distances up to 5000 km.
IEEE Photonics Technology Letters 02/2004; · 2.19 Impact Factor
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Optical Fiber Measurements, 2004. Technical Digest: Symposium on; 02/2004
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ABSTRACT: The soliton pulse shaping mechanism dominates ultrashort pulse generation in both passively and actively mode-locked lasers. In this paper, we studied the soliton stability conditions in actively mode-locked lasers with different degree of inhomogeneity. Numerical simulation shows that for an inhomogeneously broadened laser, a stable single soliton-like pulse can be generated only within a certain negative group velocity dispersion (GVD) region. Experimental results confirmed the trend for the GVD requirement.
Lasers and Electro-Optics, 2002. CLEO '02. Technical Digest. Summaries of Papers Presented at the; 02/2002
