Accurate Field Reconstruction at Low CSPR Condition Based on a Modified KK Receiver With Direct Detection

An, Shaohua; Zhu, Qingming; Li, Jingchi; Su, Yikai

doi:10.1109/jlt.2019.2960571

Cited by 28 publications

(12 citation statements)

References 14 publications

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“…However, all of the abovementioned schemes change the physical layer structure of a conventional IM/DD transmission system. In addition, at the transmitter side, dual-drive Mach-Zehnder modulators (DD-MZMs) [2], I/Q-modulators [6] or optical filters [4] are also required to achieve optical SSB modulation. As a result, a direct optical field recovery in an IM/DD system without changing the physical layer system structure is highly expected for practical deployment.…”

Section: Introductionmentioning

confidence: 99%

Data-Aided Iterative Algorithms for Linearizing IM/DD Optical Transmission Systems

Zhang

Tang

et al. 2021

J. Lightwave Technol.

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DSP-enhanced intensity-modulation direct-detection (IM/DD) systems can support up to 56 Gb/s over 100 km signal transmissions at C-band. To achieve higher data rates and longer transmission distances, we propose data-aided iterative algorithm (DIA) and decision-directed DIA (DD-DIA) to digitally mitigate signal-signal beating interference (SSBI) without requiring any modifications to physical layer structures. DIA utilizes pilot symbols with uniformly spaced insertions to relax the modified Gerchberg-Saxton (G-S) algorithms that suffer from the local optimum problem. To further improve the symbol error rate (SER) performance and convergence speed, DD-DIA introduces a decision process to generate pseudo-pilots. We numerically compare DIA with other algorithms and find that DIA can recover signals subject to large fiber dispersions corresponding to which conventional IA and Volterra filter (VF) fail, while DD-DIA significantly accelerates the convergence speed and improves the reconstruction performance compared with DIA, it can support 100-Gb/s PAM4 over 400-km IM/DD transmissions within just 50 iterations. Two orders of magnitude reductions in SER is observed for 100 Gb/s PAM4 signal transmission over 100-km SSMFs. Compared with conventional IA, the proposed techniques have higher convergence speeds, better global optimum features and large tolerances to physical model errors. In particular, DD-DIA results in larger optical signal-to-noise ratio (OSNR)/ received optical power (ROP) improvement, higher transmission capacities and less computational complexity. DD-DIA is a promising algorithm for efficiently reconstructing 2-dimensional optical field for conventional IM/DD optical transmission systems.

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Section: Introductionmentioning

confidence: 99%

Data-Aided Iterative Algorithms for Linearizing IM/DD Optical Transmission Systems

Zhang

Tang

et al. 2021

J. Lightwave Technol.

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“…While in practical application, due to the presence of the relative intensity noise of local oscillators, typically a carrier-to-signal power ratio (CSPR) of 7 dB is used to ensure the minimum phase condition. New KK schemes to achieve a low CSPR ratio has been investigated [118,119].…”

Section: Non-coherent Thz Imagingmentioning

confidence: 99%

A review on applications of integrated terahertz systems

Venkatesh

Saeidi

2021

China Commun.

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A review on Terahertz end-to-end systems with an emphasis on integrated approaches is presented. Four major catalogs of THz integrated systems, including THz communication systems, THz imaging systems, THz radars, and THz spectroscopy systems, are reviewed in this article. The performance of integrated systems is compared with non-integrated solutions, followed by a discussion on the trend in future research avenues and applications.

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“…Consequently, this condition demands a high carrier-tosignal-power ratio (CSPR) [18,19,21,43,47]. This requirement deserves further research consideration as it presents an additional sensitivity penalty [48,49]. A number of research efforts have considered a means of reducing the required CSPR in the conventional KK system through modified KK receivers [48][49][50][51][52].…”

Section: Review Of Related Workmentioning

confidence: 99%

“…Likewise, the means of addressing spectral broadening in the KK algorithm were well attended to in [18,21,[44][45][46]; however, most of them did not consider the demand for a strong CW tone, but also contributed to the issue [43]. Although measures by which the required CSPR in the conventional KK system can be lowered have been presented [48][49][50][51][52], the spectral broadening and the need to reduce the required digital upsampling have not been considered. Despite the fact that a joint optimization for the CSPR and DSP resampling rate has been considered [30,61], detailed information regarding the fundamental concept demands further consideration.…”

Section: Review Of Related Workmentioning

confidence: 99%

“…Additionally, to satisfy the minimum-phase condition, the conventional KK system demands a strong CW tone whose amplitude is comparatively greater than that of the information-bearing signal. When the minimum-phase condition is met, the field reconstruction can be accurately achieved through the KK relation at the expense of a high CSPR [48,49]. However, the requirement for a strong carrier imposes a significant limitation on the transmitter and can also increase the nonlinear fiber propagation effects in the direct detection systems [49].…”

Section: Modified Kk Algorithmsmentioning

confidence: 99%

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A Review of Self-Coherent Optical Transceivers: Fundamental Issues, Recent Advances, and Research Directions

et al. 2021

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This paper reviews recent progress on different high-speed optical short- and medium-reach transmission systems. Furthermore, a comprehensive tutorial on high-performance, low-cost, and advanced optical transceiver (TRx) paradigms is presented. In this context, recent advances in high-performance digital signal processing algorithms and innovative optoelectronic components are extensively discussed. Moreover, based on the growing increase in the dynamic environment and the heterogeneous nature of different applications and services to be supported by the systems, we discuss the reconfigurable and sliceable TRxs that can be employed. The associated technical challenges of various system algorithms are reviewed, and we proffer viable solutions to address them.

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Accurate Field Reconstruction at Low CSPR Condition Based on a Modified KK Receiver With Direct Detection

Cited by 28 publications

References 14 publications

Data-Aided Iterative Algorithms for Linearizing IM/DD Optical Transmission Systems

Data-Aided Iterative Algorithms for Linearizing IM/DD Optical Transmission Systems

A review on applications of integrated terahertz systems

A Review of Self-Coherent Optical Transceivers: Fundamental Issues, Recent Advances, and Research Directions

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