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| 11. |
- Lebedev, Alexander, et al.
(författare)
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Feasibility study and experimental verification of simplified fiber-supported 60-GHz picocell mobile backhaul links
- 2013
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Ingår i: IEEE Photonics Journal. - : Institute of Electrical and Electronics Engineers (IEEE). - 1943-0655. ; 5:4, s. 7200913-7200913
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Tidskriftsartikel (refereegranskat)abstract
- We propose and experimentally demonstrate a fiber-wireless transmission system for optimized delivery of 60-GHz radio frequency (RF) signals through picocell mobile backhaul connections. We identify advantages of 60-GHz links for utilization in short-range mobile backhaul through feasibility analysis and comparison with an alternative E-band (60-90 GHz) technology. The 60-GHz fiber-wireless-fiber setup is then introduced: two spans of up to 20 km of optical fiber are deployed and bridged by up to 4 m of wireless distance. The 60-GHz radio-over-fiber technology is utilized in the first span of fiber transmission. The system is simplified and tailored for delivery of on-off keying data signals by employing a single module for lightwave generation and modulation combined with a simplified RF downconversion technique by envelope detection. Data signals of 1.25 Gb/s are transmitted, and a bit-error-rate performance below the 7% overhead forward-error-correction limit is achieved for a range of potential fiber deployment scenarios. A spurious free dynamic range of 73 dB-Hz2/3 is attained for a frequency-doubling photonic RF upconversion technique. The power budget margin that is required to extend the wireless transmission distance from 4 m to a few hundred meters has been taken into account in the setup design, and the techniques to extend the wireless distance are analyzed.
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- Olmos, JJ Vegas, et al.
(författare)
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E-and W-Band High-Capacity Hybrid Fiber-Wireless Links
- 2014
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Ingår i: IEICE transactions on communications. - : Institute of Electronics, Information and Communication, Engineers, IEICE. - 0916-8516 .- 1745-1345. ; 97:7, s. 1290-1294
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Tidskriftsartikel (refereegranskat)abstract
- In this paper we summarize the work conducted in our group in the area of E- and W-band optical high-capacity fiber-wireless links. We present performance evaluations of E- and W-band mm-wave signal generation using photonic frequency upconversion employing both VCSELs and ECLs, along with transmission over different type of optical fibers and for a number of values for the wireless link distance. Hybrid wireless-optical links can be composed of mature and resilient technology available off-the-shelf, and provide functionalities that can add value to optical access networks, specifically in mobile backhaul/fronthaul applications, dense distributed antenna systems and fiber-over-radio scenarios.
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| 19. |
- Olmos, JJ Vegas, et al.
(författare)
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VCSEL sources for optical fiber-wireless composite data links at 60GHz
- 2013
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Ingår i: 2013 18th OptoElectronics and Communications Conference Held Jointly with 2013 International Conference on Photonics in Switching, OECC/PS 2013. - 9784885522710
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Konferensbidrag (refereegranskat)abstract
- This paper presents a performance assessment of 60-GHz mm-wave signal generation using photonic upconversion employing a VCSEL as source. The system reaches 10-9 BER over a variety of optical fibers for data rates of 1.25-Gbit/s.
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| 20. |
- Olmos, JJ Vegas, et al.
(författare)
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Wireless and wireline service convergence in next generation optical access networks-the FP7 WISCON project
- 2014
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Ingår i: IEICE transactions on communications. - : Institute of Electronics, Information and Communication, Engineers, IEICE. - 0916-8516 .- 1745-1345. ; e97.b:8, s. 1537-1546
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Tidskriftsartikel (refereegranskat)abstract
- The next generation of information technology demands both high capacity and mobility for applications such as high speed wireless access capable of supporting broadband services. The transport of wireless and wireline signals is converging into a common telecommunication infrastructure. In this paper, we will present the Marie Curie Framework Program 7 project "Wireless and wireline service convergence in next generation optical access networks" (WISCON), which focuses on the conception and study of novel architectures for wavelength-division-multiplexing (WDM) optical multi-modulation format radio-over-fiber (RoF) systems; this is a promising solution to implement broadband seamless wireless wireline access networks. This project successfully concluded in autumn 2013, and is being follow up by another Marie Curie project entitled "flexible edge nodes for dynamic optical interconnection of access and core networks" (FENDOI), which will be also briefly described.
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| 21. |
- Pang, JJ, et al.
(författare)
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Efficacy and tolerability of bevacizumab in patients with severe Covid-19
- 2021
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Ingår i: Nature communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 12:1, s. 814-
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Tidskriftsartikel (refereegranskat)abstract
- On the basis of Covid-19-induced pulmonary pathological and vascular changes, we hypothesize that the anti-vascular endothelial growth factor (VEGF) drug bevacizumab might be beneficial for treating Covid-19 patients. From Feb 15 to April 5, 2020, we conducted a single-arm trial (NCT04275414) and recruited 26 patients from 2-centers (China and Italy) with severe Covid-19, with respiratory rate ≥30 times/min, oxygen saturation ≤93% with ambient air, or partial arterial oxygen pressure to fraction of inspiration O2 ratio (PaO2/FiO2) >100 mmHg and ≤300 mmHg, and diffuse pneumonia confirmed by chest imaging. Followed up for 28 days. Among these, bevacizumab plus standard care markedly improves the PaO2/FiO2 ratios at days 1 and 7. By day 28, 24 (92%) patients show improvement in oxygen-support status, 17 (65%) patients are discharged, and none show worsen oxygen-support status nor die. Significant reduction of lesion areas/ratios are shown in chest computed tomography (CT) or X-ray within 7 days. Of 14 patients with fever, body temperature normalizes within 72 h in 13 (93%) patients. Relative to comparable controls, bevacizumab shows clinical efficacy by improving oxygenation and shortening oxygen-support duration. Our findings suggest bevacizumab plus standard care is highly beneficial for patients with severe Covid-19. Randomized controlled trial is warranted.
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| 22. |
- Pang, Xiaodan, 1986-, et al.
(författare)
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100-Gbps hybrid optical fiber-wireless transmission
- 2013
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Ingår i: 2013 18th OptoElectronics and Communications Conference Held Jointly with 2013 International Conference on Photonics in Switching, OECC/PS 2013. - : IEICE. - 9784885522710
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Konferensbidrag (refereegranskat)abstract
- We present experimental results on using optical transmission technologies such as I&Q modulators, digital coherent receivers, heterodyne up-conversion in fast photodiodes, to generate, transmit and detect high capacity wireless transmission. Both OFDM and QAM modulation formats are tested in the W-achieving capacities up to 100-Gbps with seamless optical fiber-wireless conversion.
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| 23. |
- Pang, Xiaodan, 1986-, et al.
(författare)
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A 15-meter multi-gigabit W-band bidirectional wireless bridge in fiber-optic access networks
- 2013
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Ingår i: 2013 IEEE International Topical Meeting on Microwave Photonics, MWP 2013. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781467360715 ; , s. 37-40
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Konferensbidrag (refereegranskat)abstract
- We present a bidirectional wireless bridge in the W-band enabling the seamless convergence between the wireless and fiber-optic access networks. In the downlink, a 16 Gbit/s QPSK signal is photonically up-converted at the wireless transmitter and electrically down-converted at the wireless receiver. The down-converted signal is re-modulated on to the lightwave and transmit further through the fiber-optic system. In the uplink, both up-and down-conversion are performed by electrical means. Furthermore, we investigate both passive and active wireless transmitters in this work for both downlink and uplink transmissions. With an active wireless transmitter, up to 15 meters wireless transmission is successfully achieved with a BER below the 7% FEC limit in the downlink.
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| 24. |
- Pang, Xiaodan, 1986-, et al.
(författare)
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A multi-gigabit W-band bidirectional seamless fiber-wireless transmission system with simple structured access point
- 2013
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Ingår i: Optical Communication (ECOC 2013), 39th European Conference and Exhibition on. - : Institution of Engineering and Technology. - 9781849197595 ; , s. 1182-1184
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Konferensbidrag (refereegranskat)abstract
- We propose a simple wireless access point for hybrid access networks and experimentally demonstrate bidirectional operation in W-Band. Photonic up-conversion and electrical downconversion are used in the downlink, while in the uplink both up- and down-conversion are conducted by electrical means.
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| 25. |
- Pang, Xiaodan, 1986-, et al.
(författare)
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Centralized optical-frequency-comb-based RF carrier generator for DWDM fiber-wireless access systems
- 2014
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Ingår i: Journal of Optical Communications and Networking. - : Optical Society of America. - 1943-0620 .- 1943-0639. ; 6:1, s. 1-7
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we report on a gigabit capacity fiber-wireless system that enables smooth integration between high-speed wireless networks and dense wavelength-division-multiplexing (DWDM) access networks. By employing a centralized optical frequency comb, both the wireline and the wireless services for each DWDM user can be simultaneously supported. Besides, each baseband channel can be transparently upconverted to multiple radio-frequency (RF) bands for different wireless standards, which can be flexibly filtered at the end user to select the on-demand RF band, depending on the wireless applications. For demonstration, we transmit a 2.5 Gbit/s signal through the proposed system and successfully achieve a bit-error-rate (BER) performance well below the 7% overhead forward error correction limit of the BER of 2 x 10(-3) for both the wireline and the wireless signals in the 60 GHz band after 25 km single-mode fiber plus up to 6 m wireless distance.
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| 26. |
- Pang, Xiaodan, 1986-, et al.
(författare)
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Performance evaluation for DFB and VCSEL-based 60 GHz radio-over-fiber system
- 2013
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Ingår i: 2013 17th International Conference on Optical Networking Design and Modeling, ONDM 2013. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781479904914 ; , s. 252-256
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Konferensbidrag (refereegranskat)abstract
- In this paper, we report on a detailed analysis and performance comparison work between 60 GHz radio-over-fiber systems based on a DFB laser and a C-band VCSEL. Coherent photonic up-conversion method is applied for the 60 GHz millimeter-wave signal generation. The generated signals are evaluated by means of phase noise and bit error rate for different transmission scenarios. The results show a positive potential to adopt both DFB lasers and VCSELs for the next generation 60 GHz hybrid fiber-wireless access networks.
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| 27. |
- Pang, Xiaodan, 1986-, et al.
(författare)
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Seamless optical fiber-wireless millimeter-wave transmission link for access networks
- 2013
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Ingår i: 2013 18th OptoElectronics and Communications Conference Held Jointly with 2013 International Conference on Photonics in Switching, OECC/PS 2013. - 9784885522710
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Konferensbidrag (refereegranskat)abstract
- This paper presents an experimental demonstration of a millimeter-wave wireless bridge in the W-band for transparent broadband fiber access in the sub-urban areas, where full fiber connections are impracticable.
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| 30. |
- Rodes, G A, et al.
(författare)
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Optical switching for dynamic distribution of wireless-over-fiber signals
- 2012
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Ingår i: 2012 16th International Conference on Optical Networking Design and Modelling, ONDM 2012. - 9781467314428 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- In this paper, we report on an experimental validation of dynamic distribution of wireless-over-fiber by employing optical switching using semiconductor optical amplifiers; the rest of the network was designed according to the channel distribution over the optical spectra required by the optical switch. An experimental validation was also conducted. The experiment consists of a four wavelength division multiplexed (WDM) channel system operating on a WiMax frequency band, and employing an orthogonal frequency-division multiplexing (OFDM) modulation at 625 Mbit/s per channel, transmission of the data over 20 km of optical fiber, and active switching in a one-by-sixteen active optical switch. The results show a negligible power penalty on each channel, for both the best and the worst case in terms of inter-channel crosstalk.
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