100-Gb/s DMT Transmission for Short-Reach Optical Interconnect With DAC Clock Leakage Compensation

Chen, Ming; Zhang, Long; Bai, Ke; Li, Fan; Liu, Gang; Zhou, Hui; Chen, Qinghui

doi:10.1109/lpt.2019.2947643

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…6(a), there is about 5 dB SNR degradation for the 256th SC, which is caused by the DSO clock leakage. We use a time-domain averaging method [6] to compensate for the impairment, and the estimated SC SNR after clock leakage compensation is given in Fig. 6(b).…”

Section: Resultsmentioning

confidence: 99%

“…To further improve the data rate, the discrete multi-tone (DMT) modulation technique with high spectral efficiency (SE) has been widely investigated in both real-time and offline digital signal processing (DSP) approaches [3][4][5] . Unfortunately, the overall bit error ratio (BER) or signal-to-noise ratio (SNR) performance may be seriously degraded by the various impairments in the DMT VLC transmission system, such as digitalanalog converter (DAC)/analog-digital converter (ADC)induced clock tone leakage (CTL) [6] , imperfect optoelectronic devices-induced nonlinear effect, and serious low-pass-like decline [7] . In the literature, one classic and effective scheme named the adaptive modulation technique is widely used in VLC, which can equalize the subcarrier (SC) SNR to a uniform level to boost the system's capacity [8] .…”

Section: Introductionmentioning

confidence: 99%

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OCT-based partial data-carrying subcarriers precoding and ISFA-enabled DMT-VLC system

et al. 2023

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To overcome the unbalanced signal-to-noise ratio (SNR) among data-carrying subcarriers (SCs) induced by the imperfect frequency response of optoelectronic devices and various interferences, a channel-independent partial data-carrying SCs precoding (PDSP) method based on orthogonal circular matrix transform (OCT) is proposed and experimentally investigated in an intra-symbol frequency average (ISFA)-enabled discrete multi-tone (DMT) visible light communication (VLC) system. After transmission over 1.9 m free space, at the optimal bias current of 100 mA, the experimental results show that the bit error ratio (BER) performance can be improved by up to an order of magnitude with conventional full data-carrying SCs precoding (FDSP) and PDSP scheme, compared to that without a precoding scheme. Moreover, the BER performance can further be enhanced when the ISFA algorithm with optimal taps is employed. Compared with the FDSP scheme, the proposed PDSP scheme owns a similar BER performance and a significant reduction in required multiplication and addition operations, and it may be a good option to efficiently combat the unbalanced impairments of DMT-VLC transmission systems.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

OCT-based partial data-carrying subcarriers precoding and ISFA-enabled DMT-VLC system

et al. 2023

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“…However, it requires massive multipliers for hardware implementation with high-level parallelism. In our previous work [16], two simple CTLC methods were proposed and experimentally investigated in a 100 Gbit/s DMT transmission system with 2-km single-mode fiber (SMF) link. It indicated that the proposed two methods could well compensate the CTL.…”

Section: Introductionmentioning

confidence: 99%

Low-Complexity Time-Domain Averaging-Based DAC Clock Tone Leakage Compensation for Short-Reach PAM4 Transmission

et al. 2020

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High sampling-rate digital-to-analog converters (DAC) are usually applied in optical fiber communication systems for the signal generation with advanced modulation formats such as four-level pulse amplitude modulation (PAM4). There exist various imperfections for high sampling-rate DACs. Clock tone leakage (CTL) is one of the imperfections and may seriously degrade the bit error rate (BER) performance, especially for single-carrier transmission systems. In this paper, we study a low-complexity time-domain averaging (TDA) based CTL compensation (TDA-CTLC) method for short-reach PAM4 transmission. By numerical simulation, we investigate the impacts of chromatic dispersion, CTL interference-to-signal power ratio (ISPR), and vertical resolution of the analog-to-digital converter on the BER performance. The results exhibit that the TDA-CTLC enabled PAM4 transmission system in the presence of a wide range of ISPR has a similar BER performance with the one without CTL interference. Moreover, we experimentally evaluate the compensation performance of the TDA-CTLC in a directly-modulated laser-based shortreach PAM4 transmission system. Up to −4 dB ISPR can be compensated with a slight BER performance degradation due to nonlinear distortions.

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Terahertz Wireless Communication Systems

Nissanov

Singh

2023

Antenna Technology for Terahertz Wireless Communication

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100-Gb/s DMT Transmission for Short-Reach Optical Interconnect With DAC Clock Leakage Compensation

Cited by 8 publications

References 11 publications

OCT-based partial data-carrying subcarriers precoding and ISFA-enabled DMT-VLC system

OCT-based partial data-carrying subcarriers precoding and ISFA-enabled DMT-VLC system

Low-Complexity Time-Domain Averaging-Based DAC Clock Tone Leakage Compensation for Short-Reach PAM4 Transmission

Terahertz Wireless Communication Systems

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