Proposal of PPM-RZ-mQAM scheme for suppressing nonlinear phase noise in high spectral ultra-DWDM system

Abdulzahrah, Abbas Sattar; Hmood, Jassim K.

doi:10.1007/s11082-021-03418-5

Cited by 2 publications

(1 citation statement)

References 58 publications

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“…However, the above method cannot be used if the graphics on a constellation map are not square, such as 32QAM or 128QAM. Instead, the MQAM constellation is utilized to specify the amplitude of the symbol [17] and punctuation is used directly on the constellation map.…”

Section: Modulationmentioning

confidence: 99%

SERs of Different Modulation Systems in 1G-4G

Chen

Ding

Ruan

2022

J. Phys.: Conf. Ser.

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The Digital sub-band system is an indispensable technology for the development of modern society, which has a wide range of applications. This work is particularly concerned with developing applications for modulation techniques used in mobile communication. Based on MATLAB, this paper compared the modulation and demodulation of 2ASK, 2FSK, 2PSK, and QPSK horizontally and analysed the practical and theoretical error rates. With the constellation maps of 16QAM, 32QAM, 64QAM, and 256QAM, the relationship between the error rate and the signal-to-noise ratio was studied. In binary modulation systems, 2PSK has the best noise resistance and requires 6dB less SNR than 2ASK when employing the same demodulation approach. In addition, this paper outlined the technologies and modulation standards employed in the development of 1G-4G. To make the comparison clearer, the advantage, disadvantages, and modulation comparisons among 1G-5G are displayed. The analysis and research of digital sub-band modulation technology is the basis for developing new technology in the future.

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Section: Modulationmentioning

confidence: 99%

SERs of Different Modulation Systems in 1G-4G

Chen

Ding

Ruan

2022

J. Phys.: Conf. Ser.

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Minimization of dispersion and non-linear effects in WDM based long-haul high capacity optical communication systems

Zaman,

Khan,

Khan

2024

Journal of Optical Communications

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Chromatic dispersion and nonlinear impairments pose challenges in high-capacity optical transmission systems, leading to signal distortions, channel interference and diminished the transmission performances. This paper explores the utilization of dispersion compensating fibers (DCF) using different schemes to mitigate the dispersion that accumulates along the length of a fiber in a 16 × 10 Gbps high-capacity long haul WDM system over a range of 500 km. When different wavelengths of light pulses are transmitted through an optical fiber, they experience varying speeds due to the refractive index’s wavelength dependency. As a result, the light pulses become temporally spread out as they travel through the fiber, and this dispersion persists throughout the fiber’s length. Considering non-linear effects such as self-phase modulation (SPM) and cross-phase modulation (XPM), this paper analyze and compare the three compensation schemes of DCF in a 16 channel WDM system. Moreover the impact of non-linearities based on fiber length are also analyzed and compared. The results are evaluated by comparing metrics such as Q-factor, bit error rate (BER) and eye height. The analysis concludes that the symmetrical compensation scheme of DCF outperforms the pre- and post-compensation scheme. This finding suggests that the symmetrical compensation method offers a promising solution for high-capacity access networks, providing high spectral efficiency, cost-effectiveness, and improved flexibility.

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Proposal of PPM-RZ-mQAM scheme for suppressing nonlinear phase noise in high spectral ultra-DWDM system

Cited by 2 publications

References 58 publications

SERs of Different Modulation Systems in 1G-4G

SERs of Different Modulation Systems in 1G-4G

Minimization of dispersion and non-linear effects in WDM based long-haul high capacity optical communication systems

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