Compensation for the Distorted WDM Signals through Dispersion-managed Optical Links Combined with Non-midway Optical Phase Conjugation

Yim, Hwang-Bin; Lee, Seong-Real

doi:10.14257/ijca.2018.11.9.01

Cited by 3 publications

(2 citation statements)

References 21 publications

(25 reference statements)

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“…Through previous studies, the authors also confirmed that the dispersion map optimization has significant effect on signal distortion compensation in SMF-based WDM systems [12,13]. Furthermore, even in the system where the OPC is not located in the middle of the entire transmission line (i.e., non-midway OPC system), we have confirmed that the improved compensation for the entire WDM signal can be obtained by applying a properly designed dispersion map considering the WDM channel data-rate, modulation format, and OPC location [13].…”

Section: Introductionmentioning

confidence: 57%

Compensation of the Distorted WDM Signals by Symmetric Dispersion Map with Nonuniform Zero-Crossing Place of Accumulated Dispersion in Midway-OPC System

Chung,

Lee

2023

Applied Sciences

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The nonlinear Kerr effect and chromatic dispersion are the fundamental causes of optical signal degradation in single-mode fiber (SMF) and erbium-doped fiber-amplification (EDFA)-based wavelength division multiplexing (WDM) transmission. Dispersion management combined with a midway optical phase conjugator among the technologies for compensating for such optical signal distortion is known to not be limited by the modulation format and multiplexing technology. Optimization of the dispersion map can partially alleviate the capacity and maximum transmission distance limitations of the SMF and EDFA system. In this paper, we propose various types of symmetric dispersion maps in which the position of zero-crossing place of the cumulative dispersion is not constant, and analyze the effect of each dispersion map configuration on 40 Gb/s × 24-channel WDM signal distortion compensation. When designed with the residual dispersion per span (RDPS) around 400 ps/nm, it is confirmed that most of the proposed dispersion maps are more effective in compensating the distorted WDM signal than conventional dispersion map. In particular, we confirm that, among the proposed dispersion maps, the dispersion map in which the RDPS is designed uniformly for all fiber spans can increase the power margin of WDM channel and expand the range of the total residual dispersion in the dispersion-managed link.

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Section: Introductionmentioning

confidence: 57%

Compensation of the Distorted WDM Signals by Symmetric Dispersion Map with Nonuniform Zero-Crossing Place of Accumulated Dispersion in Midway-OPC System

Chung,

Lee

2023

Applied Sciences

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“…Additionally, the SPM-induced power margin depends on the dispersion map, as well as the DCF's position with respect to the SMF [11,19]. Authors also have shown the dependence of compensation degree on the deployment of the SMF and DCF in a dispersion-managed optical link combined with the OPC [20,21]. In this work, to compensate for the WDM signal distortion caused by the combined effect of GVD and SPM, the various and special dispersion maps are proposed in the dispersion-managed optical link combined with MSSI.…”

Section: Introductionmentioning

confidence: 98%

Symmetric-type dispersion maps in dispersion-managed optical link with mid-span spectral inversion

Chung

Lee

2020

IJEECS

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In long-haul optical communication systems consisting of single-mode fiber spans and fiber amplifiers, such as an erbium-doped fiber amplifier, signal distortion causes performance to deteriorate because of group velocity dispersion and fiber nonlinearity. A combination of dispersion management and optical phase conjugation is an effective technique of compensating for the distortion. In an optical link configured with this combination, the dispersion map mainly affects the compensation for the distorted optical signals. Improvements in system performance have been reported for various types of dispersion maps. In this study, a symmetric type of dispersion map with respect to the midway optical phase conjugator is proposed. The effect of the proposed dispersion maps on the compensation for the distorted 24 channel × 40 Gbps wavelength-division-multiplexed signals was assessed through numerical simulation. It was confirmed that antipodal-type dispersion maps are most appropriate for the compensation, as well as for the flexibility of the link configuration.

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A Robust License Plate Detection and Character Recognition Algorithm Based on a Combined Feature Extraction Model and BPNN

Xie

Ming

Zhao

et al. 2018

Journal of Advanced Transportation

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The rapid development of the license plate recognition technology has made great progress for its widespread uses in intelligent transportation system (ITS). This paper has proposed a novel license plate detection and character recognition algorithm based on a combined feature extraction model and BPNN (Backpropagation Neural Network) which is adaptable in weak illumination and complicated backgrounds. Firstly, a preprocessing is first used to strengthen the contrast ratio of original car image. Secondly, the candidate regions of license plate are checked to verify the true plate, and the license plate image is located accurately by the integral projection method. Finally, a new feature extraction model is designed using three sets of features combination, training the feature vectors through BPNN to complete accurate recognition of the license plate characters. The experimental results with different license plate demonstrate effectiveness and efficiency of the proposed algorithm under various complex backgrounds. Compared with three traditional methods, the recognition accuracy of proposed algorithm has increased to 97.7% and the consuming time has decreased to 46.1ms.

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Compensation for the Distorted WDM Signals through Dispersion-managed Optical Links Combined with Non-midway Optical Phase Conjugation

Cited by 3 publications

References 21 publications

Compensation of the Distorted WDM Signals by Symmetric Dispersion Map with Nonuniform Zero-Crossing Place of Accumulated Dispersion in Midway-OPC System

Compensation of the Distorted WDM Signals by Symmetric Dispersion Map with Nonuniform Zero-Crossing Place of Accumulated Dispersion in Midway-OPC System

Symmetric-type dispersion maps in dispersion-managed optical link with mid-span spectral inversion

A Robust License Plate Detection and Character Recognition Algorithm Based on a Combined Feature Extraction Model and BPNN

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