The Experts below are selected from a list of 1437 Experts worldwide ranked by ideXlab platform
G.m. Carter - One of the best experts on this subject based on the ideXlab platform.
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probability density functions of rotations in Loop synchronous polarization scrambling for Recirculating Loop experiments
Optical Fiber Communication Conference, 2006Co-Authors: L Fomundam, Hua Jiao, J Zweck, G.m. CarterAbstract:The performance in a Recirculating Loop with a Loop-synchronous polarization scrambler is independent of the choice of probability density function (pdf) for the rotations in the polarization scrambler, unless the pdf is strongly biased.
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measurement of distributions of differential group delay in a Recirculating Loop with and without Loop synchronous scrambling
IEEE Photonics Technology Letters, 2004Co-Authors: Hua Jiao, L Yan, G.m. CarterAbstract:Using the Jones matrix eigenanalysis and Poincare/spl acute/ 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.
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optimizing the input scrambling rate in a Recirculating Loop with edfas
Conference on Lasers and Electro-Optics, 2004Co-Authors: Yu Sun, G.m. Carter, L Yan, B S Marks, C R MenyukAbstract:We optimize the input polarization scrambling rate in a Recirculating Loop by analyzing amplitude modulation in a cascade of EDFAs. This scrambling rate minimizes penalties due to PDL and PDG.
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measurement of differential group delay in a Recirculating Loop
Optical Fiber Communication Conference, 2004Co-Authors: H Jiao, L Yan, G.m. CarterAbstract:We show for the first time the measurement of DGD in a Recirculating Loop for specific fiber realizations. With this capability we measure DGD distribution in the Loop with and without scrambling.
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the long term distribution of differential group delay in a Recirculating Loop
Technical Digest: Symposium on Optical Fiber Measurements 2004., 2004Co-Authors: B S Marks, L Yan, C R Menyuk, J Zweck, G.m. CarterAbstract:It is well known that the distribution of differential group delay (DGD) in a straight-line optical fiber transmission system is a Maxwellian when the fiber realization drifts ergodically and the fiber is statistically homogeneous [I].
C R Menyuk - One of the best experts on this subject based on the ideXlab platform.
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optimizing the input scrambling rate in a Recirculating Loop with edfas
Conference on Lasers and Electro-Optics, 2004Co-Authors: Yu Sun, G.m. Carter, L Yan, B S Marks, C R MenyukAbstract:We optimize the input polarization scrambling rate in a Recirculating Loop by analyzing amplitude modulation in a cascade of EDFAs. This scrambling rate minimizes penalties due to PDL and PDG.
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the long term distribution of differential group delay in a Recirculating Loop
Technical Digest: Symposium on Optical Fiber Measurements 2004., 2004Co-Authors: B S Marks, L Yan, C R Menyuk, J Zweck, G.m. CarterAbstract:It is well known that the distribution of differential group delay (DGD) in a straight-line optical fiber transmission system is a Maxwellian when the fiber realization drifts ergodically and the fiber is statistically homogeneous [I].
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statistics of the system performance in a scrambled Recirculating Loop with pdl and pdg
IEEE Photonics Technology Letters, 2003Co-Authors: Yu Sun, C R Menyuk, I T Lima, L Yan, J Zweck, A O Lima, G.m. CarterAbstract:We have demonstrated that with the Loop-synchronous scrambling technique, the Q distribution of a Recirculating Loop closely resembles that of a straight-line system. By carefully choosing the scrambling rate, we show that slow scrambling at the transmitter improves the system performance and reduces the performance variation. We investigate the system performance for different polarization-dependent loss (PDL) levels and obtain excellent agreement between the experimental and simulation results. Our results show, for the first time, that the repolarization of the noise due to significant PDL causes an asymmetric Q-factor distribution.
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the effects of distributed pmd pdl and Loop scrambling on ber distributions in a Recirculating Loop used to emulate long haul terrestrial transmission
Optical Fiber Communication Conference, 2003Co-Authors: Jiping Wen, J Zweck, C R Menyuk, L Van, G.m. CarterAbstract:We demonstrate that, even for a long-haul Recirculating Loop system with low-PMD fiber, Loop-synchronous polarization scrambling must be used for the performance to resemble that in a straight-line system. Otherwise, the BER can vary over four orders of magnitude.
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study of system performance in a 107 km dispersion managed Recirculating Loop due to polarization effects
IEEE Photonics Technology Letters, 2001Co-Authors: I T Lima, G.m. Carter, Hua Jiao, Hai Xu, H Ereifej, C R MenyukAbstract:We investigate the polarization evolution for both signal and noise in two 107-km Recirculating Loops with polarization-dependent loss per round-trip of 0.35 dB and less than 0.1 dB, respectively. When the system is optimized, in the first case, both signal and noise are polarized, while in the second case, the signal tends to depolarize due to the noise. We experimentally measured and theoretically simulated the Q factor distribution, which is far from what is expected for straight-line systems, after 5000 km in the second case. We also suggest a simple method for obtaining the same Q distribution in Recirculating Loop experiments as expected in straight-line experiments.
Xiang Liu - One of the best experts on this subject based on the ideXlab platform.
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wdm sdm transmission of 10 x 128 gb s pdm qpsk over 2688 km 7 core fiber with a per fiber net aggregate spectral efficiency distance product of 40 320 km b s hz
Optics Express, 2012Co-Authors: S Chandrasekhar, Xiang Liu, A H Gnauck, Peter J Winzer, Y Pan, E C Burrows, Benyuan Zhu, T F Taunay, M Fishteyn, M F YanAbstract:We demonstrate 2688-km multi-span transmission using wavelength-division multiplexing (WDM) of ten 50-GHz spaced 128-Gb/s PDM-QPSK signals, space-division multiplexed (SDM) in a low-crosstalk 76.8-km seven-core fiber, achieving a record net aggregate per-fiber-spectral-efficiency-distance product of 40,320 km·b/s/Hz. The demonstration was enabled by a novel core-to-core signal rotation scheme implemented in a 7-fold, synchronized Recirculating Loop apparatus.
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performance degradation due to polarization effects in a dispersion managed soliton Recirculating Loop system
IEEE Photonics Technology Letters, 2004Co-Authors: Chongjin Xie, Linn Frederick Mollenauer, A R Grant, Xiang LiuAbstract:We investigate the performance degradation in dispersion-managed soliton systems caused by polarization-dependent loss and polarization-mode dispersion using a 600-km Recirculating Loop. We show that in an ultralong-haul transmission system, polarization effects can easily induce a variation in the bit-error rate (BER) greater than two orders of magnitude. In addition, polarization scattering caused by soliton collisions in wavelength-division-multiplexing systems makes the polarization-induced BER variation smaller than that in single-channel systems.
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experimental test of dense wavelength division multiplexing using novel periodic group delay complemented dispersion compensation and dispersion managed solitons
Optics Letters, 2003Co-Authors: Linn Frederick Mollenauer, Andrew R Grant, Xiang Liu, Xing Wei, Chongjin Xie, I KangAbstract:In an all-Raman amplified, Recirculating Loop containing 100-km spans, we have tested dense wavelength-division multiplexing at 10 Gbits/s per channel, using dispersion-managed solitons and a novel, periodic-group-delay-complemented dispersion-compensation scheme that greatly reduces the timing jitter from interchannel collisions. The achieved working distances are ≈9000 and ≈20, 000 km for uncorrected bit error rates of <10-8 and <10-3 , respectively, the latter corresponding to the use of “enhanced” forward error correction; significantly, these distances are very close to those achievable in single-channel transmission in the same system.
Rafael Riosmuller - One of the best experts on this subject based on the ideXlab platform.
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performance prediction of nonbinary forward error correction in optical transmission experiments
Journal of Lightwave Technology, 2017Co-Authors: Laurent Schmalen, Alex Alvarado, Rafael RiosmullerAbstract:In this paper, we compare different metrics to predict the error rate of optical systems based on nonbinary forward error correction (FEC). It is shown that an accurate metric to predict the performance of coded modulation based on nonbinary FEC is the mutual information. The accuracy of the prediction is verified in a detailed example with multiple constellation formats and FEC overheads, in both simulations and optical transmission experiments over a Recirculating Loop. It is shown that the employed FEC codes must be universal if performance prediction based on thresholds is used. A tutorial introduction into the computation of the thresholds from optical transmission measurements is also given.
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performance prediction of nonbinary forward error correction in optical transmission experiments
Journal of Lightwave Technology, 2017Co-Authors: Laurent Schmalen, Alex Alvarado, Rafael RiosmullerAbstract:In this paper, we compare different metrics to predict the error rate of optical systems based on nonbinary forward error correction (FEC). It is shown that an accurate metric to predict the performance of coded modulation based on nonbinary FEC is the mutual information. The accuracy of the prediction is verified in a detailed example with multiple constellation formats and FEC overheads, in both simulations and optical transmission experiments over a Recirculating Loop. It is shown that the employed FEC codes must be universal if performance prediction based on thresholds is used. A tutorial introduction into the computation of the thresholds from optical transmission measurements is also given.
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performance prediction of nonbinary forward error correction in optical transmission experiments
arXiv: Information Theory, 2016Co-Authors: Laurent Schmalen, Alex Alvarado, Rafael RiosmullerAbstract:In this paper, we compare different metrics to predict the error rate of optical systems based on nonbinary forward error correction (FEC). It is shown that the correct metric to predict the performance of coded modulation based on nonbinary FEC is the mutual information. The accuracy of the prediction is verified in a detailed example with multiple constellation formats, FEC overheads in both simulations and optical transmission experiments over a Recirculating Loop. It is shown that the employed FEC codes must be universal if performance prediction based on thresholds is used. A tutorial introduction into the computation of the threshold from optical transmission measurements is also given.
Junwen Zhang - One of the best experts on this subject based on the ideXlab platform.
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improved multi channel multi carrier generation using gain independent multi channel frequency shifting Recirculating Loop
Optics Express, 2012Co-Authors: Junwen Zhang, Ze Dong, Jianjun Yu, Xinying Li, Geekung ChangAbstract:We propose and experimentally demonstrate an improved scheme to generate optical frequency-locked multi-channel multi-carriers (MCMC), using a gain-independent multi-channel Recirculating frequency shifter (MC-RFS) Loop based on single sideband (SSB) modulation. We re-build the RFS structure with better performance. By using MC-RFS Loop, we can generate N-channel subcarriers each round trip without interference. These subcarriers of each channel are stable and frequency-locked, which can be used for multi-channel WDM source. The dual-channel RFS Loop is carried out for demonstration in our experiment with dual-carrier source. Using this scheme, we successfully generate 62 frequency-locked subcarriers with 25-GHz frequency spacing in 2 channels and each channel has 31 tones.
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multi channel multi carrier generation using multi wavelength frequency shifting Recirculating Loop
Optics Express, 2012Co-Authors: Ze Dong, Junwen Zhang, Yufeng Shao, Nan ChiAbstract:We propose and experimentally demonstrate a novel scheme to generate optical frequency-locked multi-channel multi-carriers (MCMC), using a Recirculating frequency shifter (RFS) Loop based on multi-wavelength frequency shifting single side band (MWFS-SSB) modulation. In this scheme, optical subcarriers with multiple wavelengths can be generated each round. Furthermore, the generated MCMC are frequency- and phase-locked within each channel, and therefore can be effectively used for WDM superchannel. Dual-wavelength frequency shifting SSB modulation is carried out with dual-wavelength optical seed source in our experimental demonstration. Using this scheme, we successfully generate dual-channel multi-carriers, and one channel has 28 subcarriers while the other has 29 ones with 25-GHz subcarrier spacing. We also experimentally demonstrate that this kind of source can be used to carry 50-Gb/s optical polarization-division-multiplexing quadrature phase shift keying (PDM-QPSK) signal.
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improved multicarriers generation by using multifrequency shifting Recirculating Loop
IEEE Photonics Technology Letters, 2012Co-Authors: Junwen Zhang, Nan Chi, Yufeng Shao, Li Tao, Yuanquan WangAbstract:We propose and experimentally demonstrate a novel scheme to generate optical frequency-locked multicarriers, by using Recirculating frequency shifter Loop based on multifrequency shifting single-sideband (MFS-SSB) modulation with improved tone to noise ratio (TNR) performance. By using MFS-SSB modulation, we can generate N subcarriers during each round trip without interference, and the recirculation times are reduced to 1/N of the regular scheme based on single-frequency shifting SSB modulation (SFS-SSB). Finally, the double-frequency shifting SSB modulation is carried out for demonstration in our experiment with a double-carriers source. Using this scheme, we successfully generate 95 frequency-locked subcarriers with 15 GHz frequency spacing covering from 1553.81 to 1565.26 nm with TNR larger than 23.3 dB. Compared with the results of the regular SFS-SSB scheme, more subcarriers with improved TNR (8 dB for the 95th subcarrier) are obtained.
