The Experts below are selected from a list of 66 Experts worldwide ranked by ideXlab platform
Rongqing Hui - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Theoretical Study on the Symmetries of Orthogonally Polarized Optical Signals
2014Co-Authors: William Shieh, Rongqing Hui, Graeme PendockAbstract:Abstract—We perform theoretical analysis and systematic measurement of the degree-of-polarization and Eye-Closure Penalty for optical signals with orthogonal polarizations. Both the theory and experiment show that the symmetry of the DOP is maintained for the orthogonal polarizations under both first and higher-order PMD, whereas the symmetry of Eye-Closure Penalty is broken under second-order PMD. As a result, an orthogonal polarization pair can have large disparity of Eye-Closure Penalty despite an identical degree-of-polarization. We also demonstrate a novel approach to estimate the maximum Eye-Closure Penalty asymmetry with three orthogonal polarizations on the Poincare Sphere. Index Terms—Optical communication, optical dispersion, optical fiber polarization, optical fibers, polarization mode dispersion. I
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Degree-of-Polarization and Eye-Closure Penalty Associated With Optical Signals With Orthogonal Polarizations
2014Co-Authors: William Shieh, Rongqing HuiAbstract:Abstract—We perform a systematic measurement of the degree-of-polarization (DOP) and Eye-Closure Penalty for optical signals with orthogonal polarizations. We find that the symmetry of DOP is maintained for the orthogonal polarizations under both first and higher order polarization-mode dispersion (PMD), whereas the symmetry of Eye-Closure Penalty is broken under second-order PMD. An orthogonal polarization pair can have large disparity of Eye-Closure Penalty despite an identical DOP. We also demonstrate a novel approach to estimate the maximum Eye-Closure Penalty asymmetry with three orthogonal polarizations on the Poincaré sphere. Index Terms—Optical communication, optical dispersion, optical fiber polarization, optical fibers, polarization-mode dispersion (PMD). I
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degree of polarization and Eye Closure Penalty associated with optical signals with orthogonal polarizations
IEEE Photonics Technology Letters, 2006Co-Authors: William Shieh, Rongqing HuiAbstract:We perform a systematic measurement of the degree-of-polarization (DOP) and Eye-Closure Penalty for optical signals with orthogonal polarizations. We find that the symmetry of DOP is maintained for the orthogonal polarizations under both first and higher order polarization-mode dispersion (PMD), whereas the symmetry of Eye-Closure Penalty is broken under second-order PMD. An orthogonal polarization pair can have large disparity of Eye-Closure Penalty despite an identical DOP. We also demonstrate a novel approach to estimate the maximum Eye-Closure Penalty asymmetry with three orthogonal polarizations on the Poincareacute sphere
John D Downie - One of the best experts on this subject based on the ideXlab platform.
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relationship of q Penalty to Eye Closure Penalty for nrz and rz signals with signal dependent noise
Journal of Lightwave Technology, 2005Co-Authors: John D DownieAbstract:The relationship between Q Penalty (QP) and Eye-Closure Penalty (ECP) is examined for distorted signals in the presence of signal-dependent noise. A simple model is developed to describe the behavior of return-to-zero (RZ) modulation formats and is compared with a model for nonreturn-to-zero (NRZ) formats. The accuracy of the analysis is investigated with extensive simulations, and the numerical results from analysis and simulation are found to be in generally good agreement. Experimental measurements of distortion caused by uncompensated dispersion also show agreement with the simulation results and model predictions. The simplified models allow a means to budget QPs from distortion effects in a straightforward manner during network design for different modulation formats. The analysis predicts a smaller Q Penalty as a function of ECP for RZ modulation formats in comparison with NRZ and smaller relative penalties for RZ formats with narrower pulsewidths.
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Relationship of Q Penalty to Eye-Closure Penalty for NRZ and RZ signals with signal-dependent noise
2005Co-Authors: John D DownieAbstract:Abstract—The relationship between Penalty (QP) and Eye-clo-sure Penalty (ECP) is examined for distorted signals in the pres-ence of signal-dependent noise. A simple model is developed to describe the behavior of return-to-zero (RZ) modulation formats and is compared with a model for nonreturn-to-zero (NRZ) for-mats. The accuracy of the analysis is investigated with extensive simulations, and the numerical results from analysis and simula-tion are found to be in generally good agreement. Experimental measurements of distortion caused by uncompensated dispersion also show agreement with the simulation results and model predic-tions. The simplified models allow a means to budget QPs from dis-tortion effects in a straightforward manner during network design for different modulation formats. The analysis predicts a smaller Penalty as a function of ECP for RZ modulation formats in com-parison with NRZ and smaller relative penalties for RZ formats with narrower pulsewidths. Index Terms—Distortion, Eye-Closure Penalty (ECP), Penalty (QP), signal-dependent noise (SDN). I
William Shieh - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Theoretical Study on the Symmetries of Orthogonally Polarized Optical Signals
2014Co-Authors: William Shieh, Rongqing Hui, Graeme PendockAbstract:Abstract—We perform theoretical analysis and systematic measurement of the degree-of-polarization and Eye-Closure Penalty for optical signals with orthogonal polarizations. Both the theory and experiment show that the symmetry of the DOP is maintained for the orthogonal polarizations under both first and higher-order PMD, whereas the symmetry of Eye-Closure Penalty is broken under second-order PMD. As a result, an orthogonal polarization pair can have large disparity of Eye-Closure Penalty despite an identical degree-of-polarization. We also demonstrate a novel approach to estimate the maximum Eye-Closure Penalty asymmetry with three orthogonal polarizations on the Poincare Sphere. Index Terms—Optical communication, optical dispersion, optical fiber polarization, optical fibers, polarization mode dispersion. I
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Degree-of-Polarization and Eye-Closure Penalty Associated With Optical Signals With Orthogonal Polarizations
2014Co-Authors: William Shieh, Rongqing HuiAbstract:Abstract—We perform a systematic measurement of the degree-of-polarization (DOP) and Eye-Closure Penalty for optical signals with orthogonal polarizations. We find that the symmetry of DOP is maintained for the orthogonal polarizations under both first and higher order polarization-mode dispersion (PMD), whereas the symmetry of Eye-Closure Penalty is broken under second-order PMD. An orthogonal polarization pair can have large disparity of Eye-Closure Penalty despite an identical DOP. We also demonstrate a novel approach to estimate the maximum Eye-Closure Penalty asymmetry with three orthogonal polarizations on the Poincaré sphere. Index Terms—Optical communication, optical dispersion, optical fiber polarization, optical fibers, polarization-mode dispersion (PMD). I
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degree of polarization and Eye Closure Penalty associated with optical signals with orthogonal polarizations
IEEE Photonics Technology Letters, 2006Co-Authors: William Shieh, Rongqing HuiAbstract:We perform a systematic measurement of the degree-of-polarization (DOP) and Eye-Closure Penalty for optical signals with orthogonal polarizations. We find that the symmetry of DOP is maintained for the orthogonal polarizations under both first and higher order polarization-mode dispersion (PMD), whereas the symmetry of Eye-Closure Penalty is broken under second-order PMD. An orthogonal polarization pair can have large disparity of Eye-Closure Penalty despite an identical DOP. We also demonstrate a novel approach to estimate the maximum Eye-Closure Penalty asymmetry with three orthogonal polarizations on the Poincareacute sphere
Broderick Terence - One of the best experts on this subject based on the ideXlab platform.
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Numerical and Statistical Analysis of Long-Haul Undersea Optical Communication Systems
2009Co-Authors: Broderick TerenceAbstract:Firstly, we numerically model a practical 20 Gb/s undersea configuration employing the Return-to-Zero Differential Phase Shift Keying data format. The modelling is completed using the Split-Step Fourier Method to solve the Generalised Nonlinear Schrdinger Equation. We optimise the dispersion map and per-channel launch power of these channels and investigate how the choice of pre/post compensation can influence the performance. After obtaining these optimal configurations, we investigate the Bit Error Rate estimation of these systems and we see that estimation based on Gaussian electrical current systems is appropriate for systems of this type, indicating quasi-linear behaviour. The introduction of narrower pulses due to the deployment of quasi-linear transmission decreases the tolerance to chromatic dispersion and intra-channel nonlinearity. We used tools from Mathematical Statistics to study the behaviour of these channels in order to develop new methods to estimate Bit Error Rate. In the final section, we consider the estimation of Eye Closure Penalty, a popular measure of signal distortion. Using a numerical example and assuming the symmetry of Eye Closure, we see that we can simply estimate Eye Closure Penalty using Gaussian statistics. We also see that the statistics of the logical ones dominates the statistics of the logical ones dominates the statistics of signal distortion in the case of Return-to-Zero On-Off Keying configurations.EThOS - Electronic Theses Online ServiceGBUnited Kingdo
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Numerical and statistical analysis of long-haul undersea optical communication systems
2024Co-Authors: Broderick TerenceAbstract:Firstly, we numerically model a practical 20 Gb/s undersea configuration employing the Return-to-Zero Differential Phase Shift Keying data format. The modelling is completed using the Split-Step Fourier Method to solve the Generalised Nonlinear Schrdinger Equation. We optimise the dispersion map and per-channel launch power of these channels and investigate how the choice of pre/post compensation can influence the performance. After obtaining these optimal configurations, we investigate the Bit Error Rate estimation of these systems and we see that estimation based on Gaussian electrical current systems is appropriate for systems of this type, indicating quasi-linear behaviour. The introduction of narrower pulses due to the deployment of quasi-linear transmission decreases the tolerance to chromatic dispersion and intra-channel nonlinearity. We used tools from Mathematical Statistics to study the behaviour of these channels in order to develop new methods to estimate Bit Error Rate. In the final section, we consider the estimation of Eye Closure Penalty, a popular measure of signal distortion. Using a numerical example and assuming the symmetry of Eye Closure, we see that we can simply estimate Eye Closure Penalty using Gaussian statistics. We also see that the statistics of the logical ones dominates the statistics of the logical ones dominates the statistics of signal distortion in the case of Return-to-Zero On-Off Keying configurations
K. Okamoto - One of the best experts on this subject based on the ideXlab platform.
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performance analysis of a dispersion compensator using arrayed waveguide gratings
Journal of Lightwave Technology, 2000Co-Authors: Hiroyuki Tsuda, Akira Hirano, Takashi Kurokawa, Hirokazu Takenouchi, K. OkamotoAbstract:We have developed a dispersion compensator that uses arrayed-waveguide gratings (AWGs) and a spatial filter. The compensator using AWGs with 380 waveguides in each array and the diffraction order of 53, can compensate a total second-order dispersion of 260 ps/nm with an Eye-Closure Penalty of 1 dB for a 40-Gb/s nonreturn-to-zero (NRZ) signal. It is shown that the required spatial resolution of the spatial phase filter for compensation is 2.55 /spl mu/m for silica AWGs of usual design. The acceptable fluctuation in the refractive index of the waveguides in the AWGs is as large as 5/spl times/10/sup -5/.
