Inter-Signal Distortion Analysis in Multidimensional QAM-MDPSK Modulation Optical Access Transmissions

Lee, Joungmoon; Han, Sang-Kook; Park, Jin-Woo; Han, Sang-Kook

doi:10.1109/access.2022.3171251

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…Therefore, several studies have been recently conducted on multi-dimensional transmission techniques by adding modulation resources to achieve high spectral efficiency and to eliminate these factors [9][10][11][12]. We previously reported a single wavelength-based multi-dimensional optical transmission with a quadrature amplitude modulation-polarized intensity rotational frequency shift keying-differential phase shift keying (QAM-PIRFSK-DPSK) modulation technique, which is a novel multidimensional optical modulation technique [13][14][15][16][17][18]. QAM-PIRFSK-DPSK modulation is more robust to changes in the state of polarization (SOP), especially the rotation SOP (RSOP), than polarization shift keying (PolSK)-based multi-dimensional optical modulation.…”

Section: Introductionmentioning

confidence: 99%

Interdimensional Interference Equalizing Using Recurrent Neural Network for Multi-Dimensional Optical Transmission

Ha,

Lee,

Park

et al. 2024

IEEE Access

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During multi-dimensional optical transmission, because of photodetector (PD) operation as a square law detector, signals get distorted when they are modulated on polarization and phase due to interdimensional interference (IDI) by intensity-modulated signals. We propose an IDI mitigation technique using recurrent neural network for multi-dimensional optical transmission. The signal transmission performance of the proposed equalization technique was experimentally analyzed. The performance of the proposed system was verified using the symbol error rate (SER), eye diagram of the received multidimensional modulated signal.INDEX TERMS Multi-dimensional optical modulation, interdimensional interference (IDI), recurrent neural network (RNN), optical access network.

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Section: Introductionmentioning

confidence: 99%

Interdimensional Interference Equalizing Using Recurrent Neural Network for Multi-Dimensional Optical Transmission

Ha,

Lee,

Park

et al. 2024

IEEE Access

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“…It limits the expansion of modulation level so that spectral efficiency cannot be enhanced very much. Interdimensional interference, which is recently introduced concept in multi-dimensional optical transmission, that occurs during direct phase detection also limits the level expansion and high-speed modulation [5].…”

Section: Introductionmentioning

confidence: 99%

Constellation Shaped 3D HQAM-DPSK Modulation for Single Wavelength Multi-Dimensional Optical Transmission

et al. 2023

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A novel concept for single wavelength high spectral-efficient multi-dimensional optical transmission with geometric and probabilistic constellation shaping and bit mapping technique is presented in this study. We propose a simultaneous Hexagonal RF-Quadrature Amplitude Modulation -Differential Phase Shift Keying(HQAM-DPSK) optical modulation for spectral efficient optical transmission. In order to mitigate signal distortion by inter-dimensional interference between intensity and phase, constellation shaping technique is applied to multi-dimensional optical transmission scheme. The validity of the proposed scheme is demonstrated by optical fiber transmission simulation.INDEX TERMS Multi-dimensional optical transmission, hexagonal quadrature amplitude modulation with differential phase shift keying (HQAM-DPSK), optical constellation shaping

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“…It limits the expansion of modulation level so that spectral efficiency cannot be enhanced very much. Interdimensional interference that occurs during direct phase detection also limits the level expansion and high-speed modulation [5].…”

Section: Introductionmentioning

confidence: 99%

Geometric and probabilistic constellation-shaping in high spectral efficiency multi-dimensional optical QAM-DPSK-PIRFSK transmission

Park

Lee²,

Han

2023

Next-Generation Optical Communication: Components, Sub-Systems, and Systems XII

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As data traffic in optical fiber network increases, there has been a lot of research that explores how to increase transmission capacity. Recent works suggest the multi-dimensional optical transmission as a novel solution. Multi-dimensional optical transmission is a signal transmission technique using orthogonal dimension sources such as intensity and phase of optical signal. However, previously proposed scheme has nonlinearity issue due to high frequency components in the modulation sequence and interference issue due to the transceiver structure. These issues limit the performance enhancement of multi-dimensional optical transmission. To overcome this limitation, geometric and probabilistic constellation shaping technique is aided to optical intensity-phase-polarization multidimensional modulation in direct detection system. We used quadrature amplitude modulation -differential phase shift keying -polarized intensity rotational frequency shift keying (QAM-DPSK-PIRFSK) modulation scheme to ensure orthogonality among optical intensity, phase and polarization. However, inter-dimensional interference (IDI) still occurs during direct phase detection using Mach-Zehnder delay interferometer (MZDI). To mitigate the IDI effect, RF-QAM signal modulated in optical intensity dimension is shaped geometrically and probabilistically. We used Hexagonal-QAM(HQAM) as a scheme of geometric constellation shaping to increase density of symbol and decrease peak symbol power. Also, probabilistic shaping is aided to HQAM model. With the mathematical analysis on IDI, symbol appearance probability is adjusted according to the intensity of the RF-QAM symbol. We verified the validity of the proposed technique with optical fiber transmission simulation.

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Inter-Signal Distortion Analysis in Multidimensional QAM-MDPSK Modulation Optical Access Transmissions

Cited by 5 publications

References 20 publications

Interdimensional Interference Equalizing Using Recurrent Neural Network for Multi-Dimensional Optical Transmission

Interdimensional Interference Equalizing Using Recurrent Neural Network for Multi-Dimensional Optical Transmission

Constellation Shaped 3D HQAM-DPSK Modulation for Single Wavelength Multi-Dimensional Optical Transmission

Geometric and probabilistic constellation-shaping in high spectral efficiency multi-dimensional optical QAM-DPSK-PIRFSK transmission

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