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Publikasjoner (10 av 94) Visa alla publikasjoner
Estaran, J. M., Mardoyan, H., Jorge, F., Ozolins, O., Udalcovs, A., Konczykowska, A., . . . Bigo, S. (2019). 140/180/204-Gbaud OOK Transceiver for Inter- and Intra-Data Center Connectivity. Paper presented at Optical Fiber Communications Conference and Exposition (OFC), MAR 11-15, 2018, San Diego, CA. Journal of Lightwave Technology, 37(1), 178-187
Åpne denne publikasjonen i ny fane eller vindu >>140/180/204-Gbaud OOK Transceiver for Inter- and Intra-Data Center Connectivity
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2019 (engelsk)Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 37, nr 1, s. 178-187Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We report on an ON OFF keying intensity-modulation and direct-detection C-band optical transceiver capable of addressing all datacenter interconnect environments at well beyond 100 Gbaud. For this, the transmitter makes the use of two key InP technologies: a 2:1 double heterojunction bipolar transistor selector multiplexer and a monolithically integrated distributed feedback laser traveling-wave electro-absorption modulator, both exceeding 100-GHz of 3-dB analog bandwidth. A preamplified 110-Gaz PIN photodiode prior to a 100-CHs analog-to-digital converter complete the ultrahigh bandwidth transceiver module; the device under study. In the experimental work, which discriminates between intra- and inter-data center scenarios (dispersion unmanaged 120, 560, and 960 m; and dispersion-managed 10 and 80 km of standard single-mode fiber), we evaluate the bit-error rate evolution against the received optical power at 140, 180, and 204 Gbaud ON OFF keying for different equalization configurations (adaptive linear filter with and without the help of short-memory sequence estimation) and forward error correction schemes (hard-decision codes with 7% and 20% overhead); drawing conclusions from the observed system-level limitations of the respective environments at this ultrahigh baudrate, as well as from the operation margins and sensitivity metrics. From the demonstration, we highlight three results: successful operation with >6-dB sensitivity margin below the 7% error-correction at 140 Gbaud over the entire 100 m-80 km range with only linear feed-forward equalization. Then, the transmission of a 180-Gbaud ON OFF keying carrier over 80 km considering 20% error-correction overhead. Finally, a 10-km communication at 204 (Maud ON OFF keying with up to 6 dB sensitivity margin, and regular 7% overhead error-correction.

sted, utgiver, år, opplag, sider
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
Emneord
Data center interconnects, electro-absorption modulation, InP, integrated circuits, optical fiber communication, very high-speed modulation
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-244554 (URN)10.1109/JLT.2018.2876732 (DOI)000457605700020 ()2-s2.0-85055147623 (Scopus ID)
Konferanse
Optical Fiber Communications Conference and Exposition (OFC), MAR 11-15, 2018, San Diego, CA
Merknad

QC 20190222

Tilgjengelig fra: 2019-02-22 Laget: 2019-02-22 Sist oppdatert: 2019-02-22bibliografisk kontrollert
Xue, L., Yi, L., Zhang, L., Ozolins, O., Udalcovs, A., Pang, X. & Chen, J. (2019). 50-Gb/s Dispersion-unmanaged DMT Transmission with Injection Locked 10G-class 1.55-mu m DML. In: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO): . Paper presented at Conference on Lasers and Electro-Optics (CLEO), MAY 05-10, 2019, San Jose, CA. Optical Society of America
Åpne denne publikasjonen i ny fane eller vindu >>50-Gb/s Dispersion-unmanaged DMT Transmission with Injection Locked 10G-class 1.55-mu m DML
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2019 (engelsk)Inngår i: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), Optical Society of America, 2019Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

We demonstrate 50-Gb/s DMT signal transmission over 20-km SMF by using a 10G-class 1.55-mu m DML without optical dispersion compensation. Injection locking technique is introduced, which doubles system bandwidth and greatly suppresses DML chirp.

sted, utgiver, år, opplag, sider
Optical Society of America, 2019
Serie
Conference on Lasers and Electro-Optics, ISSN 2160-9020
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-259472 (URN)10.1364/CLEO_SI.2019.SW4O.2 (DOI)000482226302139 ()2-s2.0-85068112123 (Scopus ID)978-1-943580-57-6 (ISBN)
Konferanse
Conference on Lasers and Electro-Optics (CLEO), MAY 05-10, 2019, San Jose, CA
Merknad

QC 20190917

Tilgjengelig fra: 2019-09-17 Laget: 2019-09-17 Sist oppdatert: 2019-09-17bibliografisk kontrollert
Chen, J. (2019). 5G Transport networks: Capacity, latency and cost (invited). In: Optics InfoBase Conference Papers: . Paper presented at Photonic Networks and Devices, Networks 2019, 29 July 2019 through 1 August 2017. OSA - The Optical Society
Åpne denne publikasjonen i ny fane eller vindu >>5G Transport networks: Capacity, latency and cost (invited)
2019 (engelsk)Inngår i: Optics InfoBase Conference Papers, OSA - The Optical Society , 2019Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

This paper summarizes recent research on 5G transport networks addressing challenges on capacity, service migration and techno-economics that are brought by 5G new attributes, e.g., cloud radio access networks, diverse usage scenarios and heterogeneous deployments.

sted, utgiver, år, opplag, sider
OSA - The Optical Society, 2019
Emneord
Photonic devices, Photonics, Radio access networks, Recent researches, Service migration, Techno-economics, Transport networks, Usage scenarios, 5G mobile communication systems
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-268430 (URN)2-s2.0-85077126213 (Scopus ID)9781557528209 (ISBN)
Konferanse
Photonic Networks and Devices, Networks 2019, 29 July 2019 through 1 August 2017
Merknad

QC 20200414

Tilgjengelig fra: 2020-04-14 Laget: 2020-04-14 Sist oppdatert: 2020-04-14bibliografisk kontrollert
Zhang, Z., Chen, H., Hong, X. & Chen, J. (2019). Accuracy Enhancement of Indoor Visible Light Positioning using Point-Wise Reinforcement Learning. In: 2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC): . Paper presented at 2019 Optical Fiber Communications Conference and Exhibition, OFC 2019; San Diego; United States; 3 March 2019 through 7 March 2019. IEEE
Åpne denne publikasjonen i ny fane eller vindu >>Accuracy Enhancement of Indoor Visible Light Positioning using Point-Wise Reinforcement Learning
2019 (engelsk)Inngår i: 2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), IEEE , 2019Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

A point-wise reinforcement learning (PWRL) algorithm is proposed for a multi-detector based visible light positioning system. Experimental results demonstrate that the average positioning error is reduced up to 70% by employing the proposed PWRL.

sted, utgiver, år, opplag, sider
IEEE, 2019
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-270670 (URN)000469837300597 ()2-s2.0-85065505984 (Scopus ID)
Konferanse
2019 Optical Fiber Communications Conference and Exhibition, OFC 2019; San Diego; United States; 3 March 2019 through 7 March 2019
Merknad

QC 20200313

Tilgjengelig fra: 2020-03-13 Laget: 2020-03-13 Sist oppdatert: 2020-03-13bibliografisk kontrollert
Pang, X., Ozolins, O., Zhang, L., Udalcovs, A., Lin, R., Schatz, R., . . . Chen, J. (2019). Beyond 200 Gbps per Lane Intensity Modulation Direct Detection (IM/DD) Transmissions for Optical Interconnects: Challenges and Recent Developments. In: 2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC): . Paper presented at 2019 Optical Fiber Communications Conference and Exhibition, OFC 2019; San Diego; United States; 3 March 2019 through 7 March 2019. IEEE
Åpne denne publikasjonen i ny fane eller vindu >>Beyond 200 Gbps per Lane Intensity Modulation Direct Detection (IM/DD) Transmissions for Optical Interconnects: Challenges and Recent Developments
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2019 (engelsk)Inngår i: 2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), IEEE , 2019Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

All parts of an IM/DD system are being stretched to the limit as the single lane data rate approaches 200 Gbps and beyond. We report the recent developments on the key enablers conquering this target.

sted, utgiver, år, opplag, sider
IEEE, 2019
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-270668 (URN)000469837300155 ()2-s2.0-85065482196 (Scopus ID)9781943580538 (ISBN)
Konferanse
2019 Optical Fiber Communications Conference and Exhibition, OFC 2019; San Diego; United States; 3 March 2019 through 7 March 2019
Merknad

QC 20200313

Tilgjengelig fra: 2020-03-13 Laget: 2020-03-13 Sist oppdatert: 2020-03-13bibliografisk kontrollert
Li, J., Shen, X., Chen, L., Ou, J., Wosinska, L. & Chen, J. (2019). Delay-aware bandwidth slicing for service migration in mobile backhaul networks. Journal of Optical Communications and Networking, 11(4), B1-B9, Article ID 8697074.
Åpne denne publikasjonen i ny fane eller vindu >>Delay-aware bandwidth slicing for service migration in mobile backhaul networks
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2019 (engelsk)Inngår i: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 11, nr 4, s. B1-B9, artikkel-id 8697074Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Fog computing is expected to be integrated with communication infrastructure, giving rise to the concept of fog-enhanced radio access networks (FeRANs) to support various mission-critical applications. Such architecture brings computation capabilities closer to end users, thereby reducing the communication latency to access services. In the context of FeRAN, service migration is needed to tackle limited resources in a single fog node and to provide continuous service for mobile end users. To support service migration, high capacity and low latency are required in mobile backhaul networks. Passive optical networks can be a promising solution for such mobile back-haul, in which bandwidth is shared by both migration traffic and that which is not associated with service migration. In this paper, we propose a bandwidth slicing mechanism, in which the bandwidth can be provisioned to the migration traffic and non-migration traffic dynamically and effectively to meet their different delay requirements. Simulation results verify that the proposed delay-aware bandwidth slicing scheme can handle the migration traffic properly, i.e., sending it within a required time threshold, while limiting the impact of the migration traffic on the latency and jitter of the non-migration traffic, particularly that with high priority.

sted, utgiver, år, opplag, sider
Institute of Electrical and Electronics Engineers Inc., 2019
Emneord
Bandwidth slicing, Fog computing, Mobile backhaul, Service migration, Bandwidth, Fog, Passive networks, Passive optical networks, Radio access networks, Communication infrastructure, Communication latency, Continuous services, Mission critical applications, Mobile backhaul networks, Mobile backhauls, Support services
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-255958 (URN)10.1364/JOCN.11.0000B1 (DOI)000466187100002 ()2-s2.0-85064096164 (Scopus ID)
Merknad

QC 20190815

Tilgjengelig fra: 2019-08-15 Laget: 2019-08-15 Sist oppdatert: 2019-10-24bibliografisk kontrollert
Cheng, Y., Lin, R., De Andrade, M., Wosinska, L. & Chen, J. (2019). Disaggregated Data Centers: Challenges and Tradeoffs. IEEE Communications Magazine
Åpne denne publikasjonen i ny fane eller vindu >>Disaggregated Data Centers: Challenges and Tradeoffs
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2019 (engelsk)Inngår i: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896Artikkel i tidsskrift (Annet vitenskapelig) Submitted
Abstract [en]

Resource utilization of modern data centers is significantly limited by the mismatch between the diversity of the resources required by running applications and the fixed amount of hardwired resources (e.g., number of central processing unit CPU cores, size of memory) in the server blades. In this regard, the concept of function disaggregation is introduced, where the integrated server blades containing all types of resources are replaced by the resource blades including only one specific function. Therefore, disaggregated data centers can offer high flexibility for resource allocation and hence their resource utilization can be largely improved. In addition, introducing function disaggregation simplifies the system upgrade, allowing for a quick adoption of new generation components in data centers. However, the communication between different resources faces severe problems in terms of latency and transmission bandwidth required. In particular,the CPU-memory interconnects in fully disaggregated data centers require ultra-low latency and ultra-high transmission bandwidth in order to prevent performance degradation for running applications. Optical fiber communication is a promising technique to offer high capacity and low latency, but it is still very challenging for the state-of-the-art optical transmission technologies to meet the requirements of the fully disaggregated data centers. In this paper, different levels of function disaggregation are investigated. For the fully disaggregated data centers, two architectural options are presented, where optical interconnects are necessary for CPU-memory communications. We review the state-of-the-art optical transmission technologies and carry out performance assessment when employing them to support function disaggregation in data centers. The results reveal that function disaggregation does improve the efficiency of resource usage in the data centers, although the bandwidth provided by the state-of-the-art optical transmission technologies is not always sufficient for the fully disaggregated data centers. It calls for research in optical transmission to fully utilize the advantages of function disaggregation in data centers.

HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-244839 (URN)10.1109/MCOM.001.1900612 (DOI)000521968600004 ()2-s2.0-85081130604 (Scopus ID)
Merknad

QC 20190301

Tilgjengelig fra: 2019-02-28 Laget: 2019-02-28 Sist oppdatert: 2020-05-12bibliografisk kontrollert
Van Kerrebrouck, J., Pang, X., Ozolins, O., Lin, R., Udalcovs, A., Zhang, L., . . . Yin, X. (2019). High-Speed PAM4-Based Optical SDM Interconnects With Directly Modulated Long-Wavelength VCSEL. Paper presented at Optical Fiber Communications Conference and Exposition (OFC), MAR 11-15, 2018, San Diego, CA. Journal of Lightwave Technology, 37(2), 356-362
Åpne denne publikasjonen i ny fane eller vindu >>High-Speed PAM4-Based Optical SDM Interconnects With Directly Modulated Long-Wavelength VCSEL
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2019 (engelsk)Inngår i: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 37, nr 2, s. 356-362Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This paper reports the demonstration of high-speed PAM-4 transmission using a 1.5-mu m 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 have also been shown, whereby unfortunately not all cores provide the required 3.8 x 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 preequalization based on accurate end-to-end channel characterizations. With a digital postequalization, 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.

sted, utgiver, år, opplag, sider
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
Emneord
Direct detection, digital signal processing (DSP), multicore fiber (MCF), spatial division multiplexing (SDM), vertical cavity surface emitting laser (VCSEL), 4-level pulse amplitude modulation (PAM-4)
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-246287 (URN)10.1109/JLT.2018.2875538 (DOI)000459535700016 ()2-s2.0-85054661876 (Scopus ID)
Konferanse
Optical Fiber Communications Conference and Exposition (OFC), MAR 11-15, 2018, San Diego, CA
Merknad

QC 20190325

Tilgjengelig fra: 2019-03-25 Laget: 2019-03-25 Sist oppdatert: 2019-04-04bibliografisk kontrollert
Jia, S., Lo, M.-C., Zhang, L., Ozolins, O., Udalcovs, A., Kong, D., . . . Oxenlowe, L. K. (2019). Integrated Dual-DFB Laser for 408 GHz Carrier Generation Enabling 131 Gbit/s Wireless Transmission over 10.7 Meters. In: 2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC): . Paper presented at 2019 Optical Fiber Communications Conference and Exhibition, OFC 2019; San Diego; United States; 3 March 2019 through 7 March 2019. IEEE
Åpne denne publikasjonen i ny fane eller vindu >>Integrated Dual-DFB Laser for 408 GHz Carrier Generation Enabling 131 Gbit/s Wireless Transmission over 10.7 Meters
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2019 (engelsk)Inngår i: 2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), IEEE , 2019Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

A monolithically integrated dual-DFB laser generates a 408 GHz carrier used for demonstrating a record-high single-channel bit rate of 131 Gbit/s transmitted over 10.7 m. 16-QAM-OFDM modulation and specific nonlinear equalization techniques are employed.

sted, utgiver, år, opplag, sider
IEEE, 2019
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-270666 (URN)000469837300615 ()2-s2.0-85065482808 (Scopus ID)
Konferanse
2019 Optical Fiber Communications Conference and Exhibition, OFC 2019; San Diego; United States; 3 March 2019 through 7 March 2019
Merknad

QC 20200313

Tilgjengelig fra: 2020-03-13 Laget: 2020-03-13 Sist oppdatert: 2020-03-13bibliografisk kontrollert
Cao, W., Song, W., Li, X., Zheng, S., Zhang, G., Wu, Y., . . . Chen, J. (2019). Interaction With Social Robots: Improving Gaze Toward Face but Not Necessarily Joint Attention in Children With Autism Spectrum Disorder. Frontiers in Psychology, 10, Article ID 1503.
Åpne denne publikasjonen i ny fane eller vindu >>Interaction With Social Robots: Improving Gaze Toward Face but Not Necessarily Joint Attention in Children With Autism Spectrum Disorder
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2019 (engelsk)Inngår i: Frontiers in Psychology, ISSN 1664-1078, E-ISSN 1664-1078, Vol. 10, artikkel-id 1503Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

It is widely recognized that robot-based interventions for autism spectrum disorders (ASD) hold promise, but the question remains as to whether social humanoid robots could facilitate joint attention performance in children with ASD. In this study, responsive joint attention was measured under two conditions in which different agents, a human and a robot, initiated joint attention via video. The participants were 15 children with ASD (mean age: 4.96 +/- 1.10 years) and 15 typically developing (TD) children (mean age: 4.53 +/- 0.90 years). In addition to analyses of fixation time and gaze transitions, a longest common subsequence approach (LCS) was employed to compare participants' eye movements to a predefined logical reference sequence. The fixation of TD toward agent's face was earlier and longer than children with ASD. Moreover, TD showed a greater number of gaze transitions between agent's face and target, and higher LCS scores than children with ASD. Both groups showed more interests in the robot's face, but the robot induced a lower proportion of fixation time on the target. Meanwhile participants showed similar gaze transitions and LCS results in both conditions, suggesting that they could follow the logic of the joint attention task induced by the robot as well as human. We have discussed the implications for the effects and applications of social humanoid robots in joint attention interventions.

sted, utgiver, år, opplag, sider
FRONTIERS MEDIA SA, 2019
Emneord
autism spectrum disorder, social robot, joint attention, longest common subsequence, eye tracking
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-255409 (URN)10.3389/fpsyg.2019.01503 (DOI)000474203800001 ()2-s2.0-85069513437 (Scopus ID)
Merknad

QC 20190814

Tilgjengelig fra: 2019-08-14 Laget: 2019-08-14 Sist oppdatert: 2019-08-14bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-6989-9048