10 Gb/s Radio-Over-Fiber at 28 GHz Carrier Frequency Link Based on 1550 nm VCSEL Chirp Enhanced Intensity Modulation after 2 km Fiber

Kerrebrouck, Joris Van; Li, Haolin; Spiga, Silvia; Amann, Markus; Yin, Xin; Bauwelinck, Johan; Demeester, Piet; Torfs, Guy

doi:10.1364/ofc.2018.w1f.1

Cited by 9 publications

(7 citation statements)

References 7 publications

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“…For 1-km fiber used in C-band we expect the first notch at around 60 GHz, however, due to the chirp of the VCSEL, the chromatic dispersion notch in the S21 appears unfavorably at a much lower frequency. This has also been presented in previous experiments where the linewidth enhancement factor (α H = 2β A ) of this VCSEL is found to be 12 approximately [17]. To adopt directly-modulated lasers (DML), in particular VCSELs, the linewidth enhancement factor needs to be minimized to achieve a high data rate link or to reach long distance.…”

Section: A 50 Gbaud 1-kmsupporting

confidence: 68%

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

Kerrebrouck

Pang

Ozoliņš

et al. 2019

J. Lightwave Technol.

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This paper reports the demonstration of high-speed PAM-4 transmission using a 1.5-µm single-mode vertical cavity surface emitting laser (SM-VCSEL) over multicore fiber with 7 cores over different distances. We have successfully generated up to 70 Gbaud 4-level pulse amplitude modulation (PAM-4) signals with a VCSEL in optical back-to-back, and transmitted 50 Gbaud PAM-4 signals over both 1-km dispersion-uncompensated and 10-km dispersion-compensated in each core, enabling a total data throughput of 700 Gbps over the 7-core fiber. Moreover, 56 Gbaud PAM-4 over 1-km has also been shown, whereby unfortunately not all cores provide the required 3.8 × 10 −3 bit error rate (BER) for the 7% overhead-hard decision forward error correction (7% OH-HDFEC). The limited bandwidth of the VCSEL and the adverse chromatic dispersion of the fiber are suppressed with pre-equalization based on accurate end-to-end channel characterizations. With a digital post-equalization, BER performance below the 7% OH-HDFEC limit is achieved over all cores. The demonstrated results show a great potential to realize high-capacity and compact short-reach optical interconnects for data centers.

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Section: A 50 Gbaud 1-kmsupporting

confidence: 68%

“…To obtain more insight into this effect, the S21-parameters of various fiber lengths are measured and normalized to that in optical B2B transmission, as shown in Fig. 14 [17]. It is evident that the notch becomes deeper with increasing fiber lengths.…”

Section: B 50 Gbaud 10-kmmentioning

confidence: 99%

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

Kerrebrouck

Pang

Ozoliņš

et al. 2019

J. Lightwave Technol.

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“…This is because of the chirp induced spectral broadening of VCSEL. It means that to some extent the positive chromatic dispersion of the MCF compensates the chirps of VCSEL [24]. Thus, bit-power loading does not help much and 16QAM with 330 subcarriers are used for 2.5km MCF demonstration.…”

Section: Methodsmentioning

confidence: 99%

Nonlinearity Tolerant High-Speed DMT Transmission With 1.5-<italic>μ</italic>m Single-Mode VCSEL and Multi-Core Fibers for Optical Interconnects

Westergren

Kerrebrouck

Lin

et al. 2019

J. Lightwave Technol.

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We experimentally demonstrate the generation of 107-Gbit/s net-rate optical discrete multitone (DMT) signal using a 1.5-µm single-mode vertical cavity surface emitting laser (VCSEL) with modulation bandwidth of 22-GHz. Utilizing a nonlinearity-tolerant channel equalization algorithm for digital signal processing (DSP), total net-rates of 726.6-Gbit/s over 2.5-km dispersion-uncompensated 7-core fiber and 533.1-Gbit/s over 10km dispersion-compensated 7-core fiber below 7% overhead hard-decision forward error correction (HD-FEC) limit have been experimentally achieved with a 1.5-µm VCSEL based intensitymodulation direct-detection (IM/DD) system. The features of the 1.5-µm single-mode VCSEL, 2.5-km/10km multi-core fibers and fan-in/fan-out modules are presented. Besides, the Volterra seriesbased nonlinearity-tolerant channel equalization algorithm, which improves the signal-to-noise ratio (SNR) with more than 5-dB, is mathematically described and experimentally validated. The results have demonstrated that 1.5-µm single-mode VCSEL and multi-core-fiber-based transmission can be a promising candidate to solve the capacity challenges in short-reach optical interconnects.

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“…However, the measured error vector magnitude (EVM) performance is insufficient and it can only support QPSK modulation format with low spectral efficiency. A vertical-cavity surface-emitting laser (VCSEL) is directly modulated by a 32-quadrature amplitude modulation (32-QAM) signal at 28 GHz [21]. The EVM of 8.02% was achieved after 2-km SSMF transmission.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Radio-Over-Fiber System for Over 100-km Long-Reach n-QAM Transmission

et al. 2020

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A simplified and cost-effective architecture is proposed and experimentally demonstrated with a millimeter wave (MMW) signal over fiber and free-space wireless transmission. The distributed feedback (DFB) laser is operated in optimized settings after measuring its characteristics and thus the 6 Gbps 64-quadrature amplitude modulation (64-QAM) signal can be successfully transmitted after 20-and 50-km fiber and 1-meter wireless transmission with EVM of 5.98% and 6.87%, respectively. Moreover, the EVM of 10.8% over 100-km long reach is also achieved with the 32-QAM modulation format and data rate of 5 Gbps. The experimental results show that the proposed direct modulation scheme can satisfy applications in metro and rural areas.

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10 Gb/s Radio-Over-Fiber at 28 GHz Carrier Frequency Link Based on 1550 nm VCSEL Chirp Enhanced Intensity Modulation after 2 km Fiber

Abstract: 10Gb/s, 28GHz radio-over-fiber transmission using a directly-modulated single-mode C-band VCSEL is demonstrated over 2km. The chirp of the VCSEL is translated into intensity modulation to extend the fiber-reaches and increase the power budget with 10dB.

Cited by 9 publications

References 7 publications

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

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

Nonlinearity Tolerant High-Speed DMT Transmission With 1.5-<italic>μ</italic>m Single-Mode VCSEL and Multi-Core Fibers for Optical Interconnects

A Simplified Radio-Over-Fiber System for Over 100-km Long-Reach n-QAM Transmission

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