Real-Time Demonstration of 75 GHz-Spaced DWDM Single-Carrier 400G CFP2-DCO Over 1500 km

Chen, You‐Wei; Yi, Shaoyun; Ling, G.R.; West, Brian R.; Zhao, Lina; Way, W.I.

doi:10.1109/jlt.2021.3128927

Cited by 12 publications

(2 citation statements)

References 15 publications

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“…Much effort has gone into increasing their data ratas and keeping their channel widths as low as possible. 3 presented a pluggable 400G CFP2-DCO module carrying a net data rate of 424.9 Gb/s to achieve a high spectral efficiency of 5.67 bit/s/Hz by using either a pair of 64ch 75 GHz in a point-to-point system or by ROADMs in a multispan optical network. 4 presented DSP features to overcome the bandwidth and power challenges to produce pluggable modules at 800 Gb/s with a partial response technique to compensate Tx bandwidth limitation at the receiver without noise enhancement by the Bahl, Cocke, Jelinek, and Raviv (BCJR) algorithm.…”

Section: State Of Artmentioning

confidence: 99%

Coherent data system and slow data transmission in a single fiber with ITU grid spacing

Horváth,

Sima,

Radil

et al. 2023

Optical Modeling and Performance Predictions XIII

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In the period following the COVID-19 outbreak, there continues to be a demand for high-speed data services and sufficient bandwidth. From a transport network perspective, a coherent system transmits data independent of the specific transmission wavelengths . However, it is desirable to address the transmission of slow signals (e.g., OOK) in the same fiber and their interaction between transmissions. Here, we assess the effect of a slow signal with a low modulation rate in a DWDM network on high-speed (super channel) 800G transmission. To evaluate the effect on high-speed transmission, the Q factor and ESNR parameters provided by the Ciena transmission system were analyzed. For the test setup and the combination of the coherent 800G signal with the standard DFB transceiver signal and 100 GHz spacing. The 800G signal required 112 GHz bandwidth for its transmission. For a path length of 200 km and for modulation rates of the OOK signal ranging from 100 Mbit to 4 Gbit, we found no significant effect on the evaluated parameters of the Q factor and ESNR of the transmitted 800 G signal. The more significant effect on the 800G signal is, the mutual power level of neighboring channels with different modulation types. To limit the mutual influence of adjacent signals, these signals must also be balanced according to their maximum (peak) power level in the transmitted spectrum.

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Section: State Of Artmentioning

confidence: 99%

Coherent data system and slow data transmission in a single fiber with ITU grid spacing

Horváth,

Sima,

Radil

et al. 2023

Optical Modeling and Performance Predictions XIII

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show abstract

“…The 4D modulation formats applications are investigated mainly for long-haul transmission [13], but have also been demonstrated to have advantages for metro networks applications in our previous work [10]. DWDM is an efficient way to increase overall capacity by allocating a huge amount of data to different wavelength channels and transmit them simultaneously [14][15][16][17][18][19]. The application of pulse shaping scheme, together with the DWDM system, can offer us better spectral efficiency [19].…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Transmission of Four-Dimensional LDPC-Coded Modulation with Slepian Sequences for DSP-Free 40 km Metro Network Applications

Han

Djordjević

2022

Sensors

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The growing data demands are pushing researchers to pay more attention to spectrally efficient modulation formats. The four-dimensional (4D) signal constellation modulation format has been investigated for metro networks’ applications to achieve better power efficiency. To cope with such modulation formats, the requirement of better digital signal processing (DSP) is also increasing rapidly. More complicated DSPs bring us extra costs; thus, the DSP-free coherent receivers are also investigated because of the high-power consumption of conventional DSP-based receivers, but the transceivers upgrading also results in extra costs. In this invited paper we implement a 4-dimentional modulation format based on Slepian sequences. We applied LDPC coding and experimentally investigated the BER performance in a two-dimensional (2D) 40 km fiber link transmission and demonstrate that being error free is possible without employing the complicated DSP. We compared our proposed modulation scheme with regular 16QAM and found it outperforms 16QAM with DSP over back-to-back transmission by 3.8 dB improvement in OSNR when BER = 10−5, while over 40 km metro network communication link our proposed 4D modulation signals are still successfully transmitted, and the LDPC-coding still works properly with such a new transmission strategy. On the other hand, DSP-free transmission of LDPC-coded 16-QAM exhibits an early error floor phenomenon.

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Performance Investigation of 400 × 100 Gb/s Ultra-Dense WDM System Using Different Modulation Techniques with Varying Channel Spacing

Rajeev,

Kumar

2024

Wireless Pers Commun

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Real-Time Demonstration of 75 GHz-Spaced DWDM Single-Carrier 400G CFP2-DCO Over 1500 km

Cited by 12 publications

References 15 publications

Coherent data system and slow data transmission in a single fiber with ITU grid spacing

Coherent data system and slow data transmission in a single fiber with ITU grid spacing

Two-Dimensional Transmission of Four-Dimensional LDPC-Coded Modulation with Slepian Sequences for DSP-Free 40 km Metro Network Applications

Performance Investigation of 400 × 100 Gb/s Ultra-Dense WDM System Using Different Modulation Techniques with Varying Channel Spacing

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