Final 4-ch ADDAPT TX to be published in JSSC

The final design and results of the ADDAPT VCSEL driver has been accepted for publication in IEEE Journal of Solid-State Circuits. Each lane of the 4-channel TX includes a two-tap feed-forward equalizer and achieves a data rate of 45 Gb/s. It is equipped with rapid-on/off switching capability for burst-mode operation and performance adaptivity. The TX saves 86 % of power in standby mode and can be switched-on in below 10 ns. The total power dissipation at full speed is below 100 mW, providing an energy efficiency of better than 2.11 pJ/bit.

Successful link measurement with ADDAPT TX

TUD successfully applied their ADDAPT TX for an error-free link measurement at 40 Gb/s NRZ with BER < 10 -12. As RX a TUD design in 28 nm bulk-CMOS technology from another project has been used. The total link energy efficiency is 3.4 pJ/bit at 40 Gb/s. At lower data rates, the bandwidths of the circuits can be decreased adaptively to save power. This results in 2.7 pJ/bit at 20 Gb/s. A sensitivity of -1.9 dBm optical modulation amplitude could be measured at the RX for 40 Gb/s.These results were published in IEEE Photonics Technology Letters. At the time of publication, this was the fastest 850-nm VCSEL-based single-lane non-return-to-zero optical link with all the analog front-end components fabricated in CMOS.

60 Gb/s ADDAPT Rx published in JSSC

Based on the presentation at the Symposium on VLSI Circuits 2017, IBM published their 60 Gb/s NRZ optical receiver in the IEEE Journal of Solid-State Circuits where they describe the design and the results in more detail. The Rx includes a low-latency digital CDR. It is designed in a 14-nm FinFET CMOS technology and consumes just 1.9 pJ/bit. For more information, please have a look in the Publications section.

ADDAPTive RX presented at ISSCC2018

The single-channel RX including the CDR and fully equipped with rapid power on/off switching capability was presented by our project partner IBM at the IEEE International Solid-State Circuits Conference (ISSCC) which took place from  11-15 February 2018 in San Francisco, USA. It was shown that the adaptive NRZ RX is suitable for burst-mode operation at 56 Gb/s with a power-on and CDR-lock time of less than 7 ns. Please see also the Publication section for more information.

ADDAPT achieves highly ranked publication and talk at OFC2018

At Optical Fiber Communications Conference and Exposition, which is the world largest conference on optical communications, the ADDAPT consortium will present the final version of its adaptive RX. The four-channel optical RX in 14 nm CMOS is capable of 4×40 Gb/s NRZ with only 2 pJ/bit. All lanes are equipped with rapid power-on/off switching of below 10 ns. Considering a 10% link utilization this enables up to 85% power savings.

Due to the outstanding results and innovation, the IBM talk ishighly ranked at the conference.


Final Project Meeting at WUT

The ADDAPT consortium will meet for its final plenary assembly on 26th October 2017 at project partner WUT in Warsaw, Poland. There, the project partners will summarize and evaluate the project results and organize the final steps for the project finalization.

ADDAPT at ECOC 2017 in Gothenburg, Sweden

The ADDAPT project will be present at the European Conference on Optical Communication (ECOC) which takes place 17-21 September 2017 in Gothenburg, Sweden. The partners VIS and CSTG will be present with booth on exhibition area. Furthermore, WUT and VIS present results on a “100G Flexible IM-DD 850 nm VCSEL Transceiver with Fractional Bit Rate Using Eight-Dimensional PAM”.

ADDAPT VCSEL driver to be presented at EuMIC 2017 in Nuremberg

ADDAPT consortium member TU Dresden designed a VCSEL driver which incorporates an adjustable 2-tap feed-forward equalizer (FFE) in 14 nm SOI CMOS technology. Using the FFE approach it is possible to reach data rates which exceed the inherent bandwidth of the laser. Successfully implementation and measurements reveal error-free electro-optical operation up to 42 Gb/s at 2.8 pJ/bit including the VCSEL power consumption. The design and the results will be presented at 12th European Microwave Integrated Circuits Conference (EuMIC) taking place on 08-13 October 2017 in Nuremberg, Germany.

TU Dresden presents receiver analog front end at SoCC 2017 in Munich

One part of the ADDAPT receiver module will be presented at the IEEE International System-on-Chip Conference (SOCC) which takes place on 05-08 September 2017 in Munich, Germany. An analog front end was designed and successfully characterized in 14-nm FinFET CMOS technology. The electro-optical subassembly provides up to 28 Gb/s at only 0.82 pJ/bit featuring a rapid power-on/off switching.

Journal of Lightwave publication on flexible MultiCAP modulation

Together with partners from Technical University of Denmark, the ADDAPT consortium members VIS and WUT published the results of their studies on MultiCAP modulation scheme in 850 nm VCSEL-based multimode fiber links. For the investigations the VCSEL design by VIS in ADDAPT was used. It is shown that the proposed modulation scheme can adapt to different data traffic demands and transmission link conditions, with advantages of variable bit rate and, therefore, power consumption adaptivity.

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ADDAPT co-organizes special DACINT session at ICTON 2017

The ADDAPT consortium is pleased to co-organize the 3rd workshop on Technology for Data Center Interconnects (DACINT) at 19th International Conference on Transparent Optical Networks (ICTON) which takes place July 2-6, 2017 in Girona, Spain. The project also contributes with four invited talks covering high-speed VCSELs and VCSEL transmission, adaptive high-speed and ultra-low power optical interconnect and adaptive VCSEL driver design. See Publications for more information.

IBM presents optical receiver at VLSI Symposium 2017

In June, the ADDAPT optical receiver for up to 60 Gb/s with only 1.9 pJ/bit featuring a first-order digital CDR with high jitter tolerance has been presented at the Symposium on VLSI Circuits in Kyoto, Japan. More information on the work are available in a short YouTube Interview provided by IBM Research. The work is also mentioned in EE Times.

Tunable VCSEL driver presented at IEEE Optical Interconnects Conference

Project partner TUD presented another adaptive circuit in 28 nm CMOS technology. In June at IEEE Optical Interconnects Conference, this time an adaptive VCSEL driver is presented which is capable of up to 30 Gb/s with only 1.7 pJ/bit. Successful down-scaling to 15 Gb/s is demonstrated while reducing the power consumption significantly and  maintaining the modulation amplitude.

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ADDAPT partner IBM presents 64 Gb/s receiver at leading edge conference

IBM presents the data path of the optical ADDAPT receiver at IEEE International Solid-States Circuits Conference (ISSCC) in February 2017, San Francisco , USA. ISSCC is the foremost global forum for solid-state circuits and systems-on-a-chip. The receiver data path was successfully characterized up to 64 Gb/s optically while just consuming 1.4 pJ/bit.To the best of our knowledge, this is the highest data rate with superior energy efficiency among previously reported CMOS optical RXs.

ADDAPT co-organizes special session at OFTA 2017 in Poland

The ADDAPT project co-organizes a special session on Optical Fibers in Telecommunication at the 17th Conference on Optical Fibers and Their Applications, taking place 23.01-27.01.2017 in Suprasl, Poland. With this unique chance the approaches and results of the project were presented in five talks from four project partners. See Publications for more information.

ADDAPTive receiver amplifier presented at EuMIC 2016

In October 2017, the European Microwave Integrated Circuits Conference, which is one of the premier European technical conference for RF, microwave and Terahertz microelectronics, takes place in London, UK. At this conference TU Dresden will present one of the fist bandwidth and power adaptive optical receiver amplifier implemented in a 28-nm CMOS technology. By scaling down the circuit from 30 to 10 Gb/s, 50 % of its power consumption can be saved while keeping the gain constant.

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Joint publication with Technical University of Denmark achieved on adaptive MultiCAP transmission

WUT publishes a paper on adaptive MultiCAP modulation together with their external collaborator Technical University of Denmark at Latin America Optics and Photonics Conference. The paper incorporates the application of VCSELs for MultiCAP modulation and investigates the adaptive use of the several bands for performance and bandwidth tuning.

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6th ADDAPT plenary meeting at VI Systems

The 6th ADDAPT plenary meeting takes place from 20-21 January 2016 at the project partner VI Systems in Berlin, Germany. As the second project period will end by February 2016 the consortium will conclude the work and reults of this project phase and plans the next steps in the final project phase.

ADDAPT overview presented at XXXVI-th IEEE-SPIE Joint Symposium on Photonics, Web Engineering, Electronics for Astronomy and High Energy Physics Experiments

An overview about the ADDAPT project will be given by the coordinator on Wedenesday, 27 May 2015 at the XXXVI-th IEEE-SPIE Joint Symposium on Photonics, Web Engineering, Electronics for Astronomy and High Energy Physics Experiments in Wilga village, Poland. The corresponding article will be published in the Proceedings of SPIE and therefore the work of ADDAPT is made worldwide visible.