High-Speed PAM4-Based Optical SDM Interconnects With Directly Modulated Long-Wavelength VCSEL

Kerrebrouck, Joris Van; Pang, Xiaodan; Ozoliņš, Oskars; Lin, Rui; Udaļcovs, Aleksejs; Westergren, Urban; Li, Haolin; Spiga, Silvia; Amann, Markus‐Christian; Gan, Lin; Tang, Ming; Fu, Songnian; Schatz, Richard; Jacobsen, Gunnar; Popov, Sergei; Liu, Deming; Tong, Weijun; Torfs, Guy; Bauwelinck, Johan; Chen, Jiajia; Yin, Xin

doi:10.1109/jlt.2018.2875538

Cited by 22 publications

(19 citation statements)

References 13 publications

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“…For 10 km distance, the notch is shifted away from the carrier frequency, leading again to a good EVM. This EVM degradation caused by the chromatic dispersion notch can be alleviated by adding a dispersion compensation module [32]. Only a small degradation in EVM is observed from optical B2B to 10 km fiber.…”

Section: Link Performancementioning

confidence: 99%

Real-Time 100-GS/s Sigma-Delta Modulator for All-Digital Radio-Over-Fiber Transmission

Bauwelinck

Demeester

et al. 2020

J. Lightwave Technol.

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All-digital radio-over-fiber (RoF) transmission has attracted a significant amount of interest in digital-centric systems or centralized networks because it greatly simplifies the front-end hardware by using digital processing. The sigma-delta modulator (SDM)-based all-digital RoF approach pushes the digital signal processing as far as possible into the transmit chain. We present a real-time 100-GS/s fourth-order single-bit SDM for all-digital RoF transmission in the high-frequency band without the aid of analog/optical up-conversion. This is the fastest sigma-delta modulator reported and this is also the first real-time demonstration of sigma-delta-modulated RoF in the frequency band above 24 GHz. 4.68 Gb/s (2.34 Gb/s) 64-QAM is transported over 10-km standard single-mode fiber in the C-band with 6.46% (4.73%) error vector magnitude and 3.13 Gb/s 256-QAM can be even received in an optical back-to-back configuration. The carrier frequency can be digitally tuned at run-time, covering a wide frequency range from 22.75 to 27.5 GHz. Besides, this high-speed sigma-delta modulator introduces less than 1 µs latency in the transmit chain. Its all-digital nature enables network virtualization, making the transmitter compatible with different existing standards. The prominent performance corroborates the strong competitiveness of this SDMbased RoF approach in high-frequency RoF 5G communication.

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Section: Link Performancementioning

confidence: 99%

Real-Time 100-GS/s Sigma-Delta Modulator for All-Digital Radio-Over-Fiber Transmission

Bauwelinck

Demeester

et al. 2020

J. Lightwave Technol.

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“…Besides the work on improving device performance, other techniques such as advanced modulation scheme (e.g., four-level pulse amplitude modulation (PAM4)), analog coherent modulation [11], wavelength division multiplexing (WDM) or space division multiplexing (SDM) [12] are utilized to increase the Datacom bandwidth. In this paper, we review several modulation techniques for Datacom, from VCSEL direct modulation to silicon photonics modulators then to hybrid silicon modulators.…”

Section: Introductionmentioning

confidence: 99%

Modulation on Silicon for Datacom: Past, Present, and Future (Invited Review)

Wang¹,

Huang²,

Chen³

et al. 2019

PIER

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Datacenters become an important part of technical infrastructure. The Datacom traffic grows exponentially to satisfy the demands in IT services, storage, communications, and networking to the growing number of networked devices and users. High bandwidth and energy efficient optical interconnects are critical to improve overall productivity and efficiency in data centers. Mega-data centers are expected to address the power consumption and the cost in which optical interconnects contribute quite a large part. Silicon photonics is a promising platform to offer savings in power and potential increase in bandwidth for Datacom. Several modulation techniques are developed in silicon photonics to reduce the optical mode volume or enhance the light matter effect to further improve the modulation efficiency. Many other materials such as III-V and LiNbO 3 are integrated on silicon photonics to maximize the optical link performance. This paper reviews several modulation techniques for Datacom, from vertical-cavity surface-emitting laser (VCSEL) direct modulation to silicon photonics modulators then to hybrid silicon modulators.

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“…Meanwhile, spatial division multiplexing (SDM) techniques provide an alternative approach to cope with an ever-increasing capacity demand, showing a great potential to achieve 1-Tbps and beyond [9]. Novel system techniques, such as vertical cavity surface emitting laser (VCSEL) with multi-core fiber (MCF), are promising to increase the spatial bandwidth density [10]. Although the cost-effective broadband opto-electrical components have been developing rapidly to keep pace with the capacity requirement of optical short-reach systems, the impairments, especially the nonlinear ones, introduced by these components to the high-speed short-reach communication systems cannot be neglected and become a significant issue that hinders the capacity improvement [2].…”

Section: Introductionmentioning

confidence: 99%

“…result can be expressed only with the training data set [10,12]. Hence, the optimization problem with an arbitrary number of variables is transformed into the one with N variables.…”

mentioning

confidence: 99%

Kernel mapping for mitigating nonlinear impairments in optical short-reach communications

Westergren¹,

Pang²,

Udaļcovs³

et al. 2019

Opt. Express

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Nonlinear impairments induced by the opto-electronic components are one of the fundamental performance-limiting factors in high-speed optical short-reach communications, significantly hindering capacity improvement. This paper proposes to employ a kernel mapping function to map the signals in a Hilbert space to its inner product in a reproducing kernel Hilbert space, which has been successfully demonstrated to mitigate nonlinear impairments in optical short-reach communication systems. The operation principle is derived. An intensity modulation/direct detection system with 1.5-µm vertical cavity surface emitting laser and 10-km 7core fiber achieving 540.68-Gbps (net-rate 505.31-Gbps) has been carried out. The experimental results reveal that the kernel mapping based schemes are able to realize comparable transmission performance as the Volterra filtering scheme even with a high order.

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High-Speed PAM4-Based Optical SDM Interconnects With Directly Modulated Long-Wavelength VCSEL

Cited by 22 publications

References 13 publications

Real-Time 100-GS/s Sigma-Delta Modulator for All-Digital Radio-Over-Fiber Transmission

Real-Time 100-GS/s Sigma-Delta Modulator for All-Digital Radio-Over-Fiber Transmission

Modulation on Silicon for Datacom: Past, Present, and Future (Invited Review)

Kernel mapping for mitigating nonlinear impairments in optical short-reach communications

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