100 Gbit/s PAM4 signal transmission and reception for 2-km interconnect with adaptive notch filter for narrowband interference

Li, Fan; Zou, Dongdong; Ding, Li; Sun, Yidan; Li, Jianping; Shu, Qi; Li, Liangchuan; Yi, Xingwen; Li, Zhaohui

doi:10.1364/oe.26.024066

Cited by 38 publications

(11 citation statements)

References 7 publications

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“…Therefore, the BER performance is degraded obviously at high ROPs when ISPR is larger than −4 dB. Also, we compare the results with ANF-based CTLC proposed in [15] to that of the proposed TDA-CTLC in this work. In our experiment, the adaptation step size and amplitude of the reference signal for the ANF-CTLC are 1e-4 and 0.8, respectively.…”

Section: Experimental Verificationmentioning

confidence: 92%

“…As a result, the total number of symbols in one frame is 1,203,072. Afterward, the frame signal is up-sampled by a factor of 3 and shaped by a square root raised cosine (SRRC) filter [15], [24], [25] with a roll-off factor of 0.1. The filter order of the SRRC is 1024 in this work.…”

Section: Simulation Setupmentioning

confidence: 99%

“…A rigid initial calibration is required to be performed to reduce the amplitude and phase mismatches to obtain the best mitigation efficiency. A 2-tap least mean square(LMS) based adaptive notch filter was also proposed and employed in both short-reach 100 Gbit/s PAM4 and DMT systems for CTL compensation (CTLC) [13], [15]. However, it requires massive multipliers for hardware implementation with high-level parallelism.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Experimental Verificationmentioning

confidence: 92%

Section: Simulation Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…A delay time difference occurs among these two orthogonally polarized modes, due to small perturbation inside the optical fiber. The impairments generated by this phenomenon are called PMD [26]. The impairments caused by the dispersion are more severe in the case of multi carrier OCN and, hence, affect the overall optical system efficiency.…”

Section: Polarization Mode Dispersionmentioning

confidence: 99%

Adaptive Equalization for Dispersion Mitigation in Multi-Channel Optical Communication Networks

et al. 2019

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Optical communication networks (OCNs) provide promising and cost-effective support for the ultra-fast broadband solutions, thus enabling them to address the ever growing demands of telecommunication industry such as high capacity and end users’ data rate. OCNs are used in both wired and wireless access networks as they offer many advantages over conventional copper wire transmission such as low power consumption, low cost, ultra-high bandwidth, and high transmission rates. Channel effects caused by light propagation through the fiber limits the performance, hence the data rate of the overall transmission. To achieve the maximum performance gain in terms of transmission rate through the OCN, an optical downlink system is investigated in this paper using feed forward equalizer (FFE) along with decision feedback equalizer (DFE). The simulation results show that the proposed technique plays a key role in dispersion mitigation in multi-channel optical transmission to uphold multi-Gb/s transmission. Moreover, bit error rate (BER) and quality factor (Q-factor) below 10 − 5 and above 5, respectively, are achieved with electrical domain equalizers for the OCN in the presence of multiple distortion effects showing the effectiveness of the proposed adaptive equalization techniques.

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“…To transmit high-capacity signal on limited bandwidth, multi-level modulations have been widely investigated in research and commercial fields. 4-level pulse-amplitude modulation (PAM4) has been standardized by IEEE P802.3bs 400-Gb/s Ethernet Task Force for short-reach optical interconnects [4][5][6]. 4×100-Gbit/s optical PAM4 system is a favored option to achieve 400-Gbit/s interface for short-reach optical interconnects.…”

Section: Introductionmentioning

confidence: 99%

Adaptive moment estimation for polynomial nonlinear equalizer in PAM8-based optical interconnects

Zhou¹,

Wang²,

Wei³

et al. 2019

Opt. Express

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Adaptive moment estimation (Adam) is a popular optimization method to estimate large-scale parameters in neural networks. This paper proposes the first use of Adam algorithm to fast and stably converge large-scale tap coefficients of polynomial nonlinear equalizer (PNLE) for 129-Gbit/s PAM8-based optical interconnects. PNLE is one of simplified Volterra nonlinear equalizer for making a trade-off between complexity and performance. Different from serial least-mean square (LMS) adaptive algorithm, Adam algorithm is a parallel processing algorithm, which can obtain globally optimal tap coefficients without being trapped in locally optimal tap coefficients. Timing error is one of the main obstacles to the PAM systems with high baud rate and high modulation order. Owing to parallel processing and global optimization, Adam algorithm has much better performance on resisting the timing error, which can achieve faster, more-stable and lower-MSE convergence compared to LMS adaptive algorithm. In conclusion, Adam algorithm shows great potential for converging the tap coefficients of PNLE in PAM8-based optical interconnects.

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100 Gbit/s PAM4 signal transmission and reception for 2-km interconnect with adaptive notch filter for narrowband interference

Cited by 38 publications

References 7 publications

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

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

Adaptive Equalization for Dispersion Mitigation in Multi-Channel Optical Communication Networks

Adaptive moment estimation for polynomial nonlinear equalizer in PAM8-based optical interconnects

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