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Dive into the research topics where Renato Vaernewyck is active.

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Featured researches published by Renato Vaernewyck.


IEEE Photonics Technology Letters | 2015

40 Gb/s PAM-4 Transmitter IC for Long-Wavelength VCSEL Links

Wouter Soenen; Renato Vaernewyck; Xin Yin; Silvia Spiga; Markus-Christian Amann; Kamalpreet Kaur; Paraskevas Bakopoulos; Johan Bauwelinck

Conventional 850 nm multimode fiber links deployed in warehouse-scale data centers will be limited by modal dispersion beyond 10 Gb/s when covering distances up to 1 km. This can be resolved by opting for a single-mode fiber (SMF), but typically requires the use of power-hungry edge-emitting lasers. We investigate the feasibility of a high-efficiency SMF link by reporting a 0.13 μm SiGe BiCMOS laser diode driver optimized for long-wavelength vertical-cavity surface-emitting lasers (VCSELs). Bit-error rate experiments at 28 and 40 Gb/s up to 1 km of SMF reveal that four-level pulse amplitude modulation can compete with non-return-to-zero in terms of energy efficiency and scalability. With 9.4 pJ/b, the presented transmitter paves the way for VCSEL-based SMF links in data centers.


Optics Express | 2017

Silicon-organic hybrid (SOH) modulators for intensity-modulation / direct-detection links with line rates of up to 120 Gbit/s

Heiner Zwickel; Stefan Wolf; Clemens Kieninger; Y. Kutuvantavida; Matthias Lauermann; Timothy De Keulenaer; Arno Vyncke; Renato Vaernewyck; Jingdong Luo; Alex K.-Y. Jen; Wolfgang Freude; Johan Bauwelinck; Sebastian Randel; Christian Koos

High-speed interconnects in data-center and campus-area networks crucially rely on efficient and technically simple transmission techniques that use intensity modulation and direct detection (IM/DD) to bridge distances of up to a few kilometers. This requires electro-optic modulators that combine low operation voltages with large modulation bandwidth and that can be operated at high symbol rates using integrated drive circuits. Here we explore the potential of silicon-organic hybrid (SOH) Mach-Zehnder modulators (MZM) for generating high-speed IM/DD signals at line rates of up to 120 Gbit/s. Using a SiGe BiCMOS signal-conditioning chip, we demonstrate that intensity-modulated duobinary (IDB) signaling allows to efficiently use the electrical bandwidth, thereby enabling line rates of up to 100 Gbit/s at bit error ratios (BER) of 8.5 × 10-5. This is the highest data rate achieved so far using a silicon-based MZM in combination with a dedicated signal-conditioning integrated circuit (IC). We further show four-level pulse-amplitude modulation (PAM4) at lines rates of up to 120 Gbit/s (BER = 3.2 × 10-3) using a high-speed arbitrary-waveform generator and a 0.5 mm long MZM. This is the highest data rate hitherto achieved with a sub-millimeter MZM on the silicon photonic platform.


Journal of Lightwave Technology | 2014

Multichannel 25 Gb/s Low-Power Driver and Transimpedance Amplifier Integrated Circuits for 100 Gb/s Optical Links

Jochen Verbrugghe; Renato Vaernewyck; Bart Moeneclaey; Xin Yin; Graeme Maxwell; Richard Cronin; Guy Torfs; Xing-Zhi Qiu; Caroline P. Lai; Paul D. Townsend; Johan Bauwelinck

Highly integrated electronic driver and receiver ICs with low-power consumption are essential for the development of cost-effective multichannel fiber-optic transceivers with small form factor. This paper presents the latest results of a two-channel 28 Gb/s driver array for optical duobinary modulation and a four-channel 25 Gb/s TIA array suited for both NRZ and optical duobinary detection. This paper demonstrated that 28 Gb/s duobinary signals can be efficiently generated on chip with a delay-and-add digital filter and that the driver power consumption can be significantly reduced by optimizing the drive impedance well above 50 Ω, without degrading the signal quality. To the best of our knowledge, this is the fastest modulator driver with on-chip duobinary encoding and precoding, consuming only 652 mW per channel at a differential output swing of 6 Vpp. The 4 × 25 Gb/s TIA shows a good sensitivity of -10.3 dBm average optical input power at 25 Gb/s for PRBS 231-1 and low power consumption of 77 mW per channel. Both ICs were developed in a 130 nm SiGe BiCMOS process.


Optics Express | 2013

113Gb/s (10 x 11.3Gb/s) ultra-low power EAM driver array.

Renato Vaernewyck; Johan Bauwelinck; Xin Yin; Ramses Pierco; Jochen Verbrugghe; Guy Torfs; Zhisheng Li; Xing-Zhi Qiu; Jan Vandewege; Richard Cronin; Anna Borghesani; D.G. Moodie

This paper presents an ultra-low power SiGe BiCMOS IC for driving a 10 channel electro-absorption modulator (EAM) array at 113Gb/s for wavelength division multiplexing passive optical network (WDM-PON) applications. With an output swing of 2.5V(pp), the EAM driver array consumes only 2.2W or 220mW per channel, 50% below the state of the art. Both the output swing and bias are configurable between 1.5 and 3.0V(pp) and 0.75-2.15V respectively.


optical fiber communication conference | 2017

Segmented Optical Transmitter Comprising a CMOS Driver Array and an InP IQ-MZM for Advanced Modulation Formats

Michael Vanhoecke; Alessandro Aimone; N. Argyris; Stefanos Dris; Renato Vaernewyck; Koen Verheyen; Marko Gruner; Gerrit Fiol; Dimitris Apostolopoulos; Hercules Avramopoulos; Guy Torfs; Xin Yin; Johan Bauwelinck

Segmented Mach–Zehnder modulators are promising solutions to generate complex modulation schemes in the migration towards optical links with a higher-spectral efficiency. We present an optical transmitter comprising a segmented-electrode InP IQ-MZM, capable of multilevel optical signal generation (5-bit per I/Q arm) by employing direct digital drive from integrated, low-power (1W) CMOS binary drivers. We discuss the advantages and design tradeoffs of the segmented driver structure and the implementation in a 40 nm CMOS technology. Multilevel operation with combined phase and amplitude modulation is demonstrated experimentally on a single MZM of the device for 2-ASK-2PSK and 4-ASK-2-PSK, showing potential for respectively 16-QAM and 64-QAM modulation in future assemblies.


optical fiber communication conference | 2017

100 Gbit/s serial transmission using a silicon-organic hybrid (SOH) modulator and a duobinary driver IC

Heiner Zwickel; T. De Keulenaer; Stefan Wolf; Clemens Kieninger; Y. Kutuvantavida; Matthias Lauermann; Michiel Verplaetse; Ramses Pierco; Renato Vaernewyck; Arno Vyncke; Xin Yin; Guy Torfs; Wolfgang Freude; Elad Mentovich; Johan Bauwelinck; Christian Koos

100 Gbit/s three-level (50 Gbit/s OOK) signals are generated using a silicon-organic hybrid modulator and a BiCMOS duobinary driver IC at a BER of 8.5×10<sup>−5</sup>(<10<sup>−2</sup>). We demonstrate dispersion-compensated transmission over 5 km.


ieee optical interconnects conference | 2017

Real-time 100 Gb/s NRZ-OOK transmission with a silicon photonics GeSi electro-absorption modulator

Jochem Verbist; Michiel Verplaetse; S. A. Srinivasan; P. De Heyn; T. De Keulenaer; Renato Vaernewyck; Ramses Pierco; Arno Vyncke; Peter Verheyen; S. Balakrishnan; Guy Lepage; Marianna Pantouvaki; P. Absil; Xin Yin; Günther Roelkens; Guy Torfs; J. Van Campenhout; Johan Bauwelinck

We demonstrate single-wavelength, serial and real-time 100 Gb/s NRZ-OOK transmission over 500 m SSMF with a GeSi EAM implemented on a silicon photonics platform. The device was driven with 2 Vpp without 50 Ω termination, allowing a low-complexity solution for 400 GbE short-reach optical interconnects.


ieee optical interconnects conference | 2017

Towards efficient 100 Gb/s serial rate optical interconnects: A duobinary way

Xin Yin; Michiel Verplaetse; Laurens Breyne; J. Van Kerrebrouck; T. De Keulenaer; Arno Vyncke; Ramses Pierco; Renato Vaernewyck; Silvia Spiga; Markus-Christian Amann; Jiajia Chen; G. Van Steenberge; Guy Torfs; Johan Bauwelinck

Recent advances in integrated opto-electronic devices and front end circuits have made it possible to efficiently transmit very high data rates over optical links for HPC/datacenter applications. This paper reviews our current progress towards serial 100-Gb/s optical interconnects, with emphasis on electrical duobinary (EDB) modulation.


IEEE Transactions on Circuits and Systems | 2017

Adaptive Transmit-Side Equalization for Serial Electrical Interconnects at 100 Gb/s Using Duobinary

Michiel Verplaetse; Timothy De Keulenaer; Arno Vyncke; Ramses Pierco; Renato Vaernewyck; Joris Van Kerrebrouck; Johan Bauwelinck; Guy Torfs

The ever-increasing demand for more efficient data communication calls for new, advanced techniques for high speed serial communication. Although newly developed systems are setting records, off-line determination of the optimal equalizer settings is often needed. Well-known adaptive algorithms are mainly applied for receive-side equalization. However, transmit-side equalization is desirable for its reduced linearity requirements. In this paper, an adaptive sign–sign least mean square equalizer algorithm is developed applicable for an analog transmit-side feed-forward equalizer (FFE) capable of transforming non-return-to-zero modulation to duobinary (DB) modulation at the output of the channel. In addition to the derivation of the update strategy, extra algorithms are developed to cope with the difficult transmit–receive synchronization. Using an analog six tap bit-spaced equalizer, the algorithm is capable of optimizing DB communication of 100Gb/s over 1.5-m Twin-Ax cable. Both simulations and experimental results are presented to prove the capabilities of the algorithm demonstrating automated determination of FFE parameters, such that error-free communication is obtained (BER


optical network design and modelling | 2014

Performance evaluation of single carrier 40-Gbit/s downstream for long-reach passive optical networks

Xin Yin; Xing-Zhi Qiu; Guy Torfs; C. Van Praet; Renato Vaernewyck; Arno Vyncke; Jochen Verbrugghe; Bart Moeneclaey; Marco Ruffini; David B. Payne; Johan Bauwelinck

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