- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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The analytical model of frequency response and bandwidth for coupled multilayer graphene nanoribbon interconnects
摘要： This paper applies the multilayer graphene nanoribbons (MLGNR) as a prospective candidate material to replace the conventional copper (Cu) for next generation on-chip interconnects. Based on the equivalent single conductor (ESC) modeling, a distributed transmission line model for coupled MLGNR interconnects is presented to obtain the transfer gain and 3-dB bandwidth at the global level of 14 nm technology node, which take the in-phase and out-of-phase crosstalk modes into consideration, and verified with the Hspice simulation. It is demonstrated that the MLGNR and Cu interconnects under in-phase mode have a larger transfer gain and a wider 3-dB bandwidth than that under out-of-phase mode, and MLGNR interconnects can more effectively improve the transfer gain and 3-dB bandwidth compared with Cu interconnects at the same conditions. The numerical calculation results show that, decreasing interconnect temperature, increasing line space and increasing driver and load sizes are efficient ways to enhance the transfer gain and 3-dB bandwidth for MLGNR and Cu interconnects. Moreover, the top contact MLGNR (TC-MLGNR) also can be used as an emerging material for on-chip interconnects to replace the conventional Cu. In addition, it is found that the results obtained by the proposed model are in good matching with Hspice simulation and the maximum relative deviation for them is less than 4%, meanwhile the efficiency of CPU runtime is improved over 90% by using the proposed model, as compared to Hspice simulation. The results presented in this paper would be useful to design the on-chip interconnects with better bandwidth characteristics.
关键词： TC-MLGNR,3-dB bandwidth,MLGNR interconnects,on-chip interconnects,Cu interconnects,transfer gain
更新于2025-09-23 15:21:01
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WDM-based bidirectional chaotic communication for semiconductor lasers system with time delay concealment
摘要： In this paper, we propose a wavelength-division-multiplexing (WDM)-based chaos communication configuration allowing for the bidirectional exchange of information. In the scheme, the output of a master semiconductor laser (MSL), is injected into slave semiconductor lasers (SSLs), drives the chaotic synchronization of SSLs with optical feedback and electro-optical phase feedback. By calculating the largest Lyapunov exponent (LLE), Lempel–Ziv complexity (LZC) and permutation entropy (PE), we find that the system can generate the chaotic signal with high complexity. We also demonstrate that the chaotic signal bandwidth obtained is as high as 24.68 GHz by selecting the suitable parameters; this configuration intrinsically conceals the electro-optical phase feedback time delay signature (TDS) and optical feedback TDS in transmitted variable; this delayed chaotic dynamics are identically synchronized when the parameters of emitter are exactly matched with that of receiver; while the external and internal parameters’ mismatch between emitter and receiver can lead to the decrease of the synchronization quality. In addition, the result reveals that the channel spacing has influence on cross-correlation coefficient (XCF) quantifying synchronization quality. At last, the messages introduced at two ends of the link can be successfully encrypted and decrypted, and we quantitatively analyze the corresponding Q-factor at different transmission rates.
关键词： Semiconductor lasers,Optical chaos,Time delay signature concealment,All-optical network,bandwidth
更新于2025-09-23 15:21:01
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[ASME ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems - San Antonio, Texas, USA (Monday 10 September 2018)] Volume 2: Mechanics and Behavior of Active Materials; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting; Emerging Technologies - Nonlinear Dynamics of a Special Piezoelectric Energy Harvester With a Special Bistable Piezoelectric Cantilever Beam
摘要： This paper presents a special piezoelectric energy harvester system which is obtained by separating the end of the upper piezoelectric layer of the traditional piezoelectric cantilever beam from its basic layer. A mass I is located at the end of the separated upper piezoelectric layer (SUPL), a mass II and a permanent magnet I are located at the end of the separated lower piezoelectric beam (SLPB) and a permanent magnet II is added in the opposite position of the permanent magnet I and they face each other with same polarities. A nonlinear magnetic force which can broaden the frequency bandwidth of the system is generated mutually on the two permanent magnets. Studies find that this special piezoelectric energy harvester has extremely high energy capture efficiency. In order to further explore the reason of high efficiency, experimental research on its dynamic behavior is carried out. The experimental results show that the vibrations of the SUPL and the SLPB are relatively simple. The dynamic behaviors of the SUPL, the SLPB and the unseparated part are different. The unseparated part of the piezoelectric relatively complex nonlinear phenomenon due to the interaction of nonlinear magnetic force and the collision. With the increase of the external excitation frequency, period doubling motion and almost periodic motion appear alternately.
关键词： nonlinear magnetic force,dynamic behavior,energy harvester,frequency bandwidth
更新于2025-09-23 15:21:01
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Technology Roadmap for Time Division Multiplexed Passive Optical Networks (TDM PONs)
摘要： Commercial passive optical networks (PONs) up to 10 Gb/s have traditionally leveraged mature components from transport and metro transport systems. Starting soon with 25G PON, the data center ecosystem will be leveraged. A strategy to accommodate the higher speed of 25 Gb/s at low incremental cost to 10G PON is presented—essentially to adhere to a simple architecture and to avoid the need for expensive optical amplification. The 25G PON wavelength plan and co-existence scenarios with existing PONs are described. The ability of Time Division Multiplexed (TDM) PONs to address the 5G backhaul, midhaul and fronthaul transport use case is evaluated. The technology roadmap to a future 50G TDM PON is discussed. Analysis of the major challenge, meeting PON loss budgets at 50 Gb/s with higher launch power, is presented, including the cost dependence of transmitter power. This is followed by a short review of research in the field of coherent detection in PON systems, which will be important for 100G PON.
关键词： SOA,modulation,dispersion,25G,50G,PON,passive optical networks,coherent,bandwidth,100G
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE International Ultrasonics Symposium (IUS) - Glasgow, United Kingdom (2019.10.6-2019.10.9)] 2019 IEEE International Ultrasonics Symposium (IUS) - Towards a CMOS Integrated Optically Controlled AlN Transducer
摘要： The impact of the signal bandwidth and observation bandwidth on the detection performance of the maximum-minimum eigenvalue detector is studied in this letter. The considered signals are the Gaussian signals. The optimum ratio between the signal and the observation bandwidth is analytically proven to be 0.5 when reasonable values of the system dimensionality are used. The analytical proof is veri?ed by simulations.
关键词： Maximum-minimum eigenvalue detection,detection bandwidth,Marchenko Pastur density,occupation bandwidth
更新于2025-09-23 15:19:57
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Improving modulation bandwidth and optical power of GaNa??based blue LED by hollowa??runway active area
摘要： We demonstrate a higher-bandwidth and optical power GaN-based blue light-emitting diode for visible-light communication applications. By using a hollow-runway active area and hollow-runway current-confined aperture structure, we obtain an electrical-to-optical (E-O) 3 dB bandwidth (f?3 dB) significantly higher than that of a rectangle-structure LED with the same epitaxial structure and area of active area. Meanwhile, its optical power can reach 48.65 mW, even higher than a rectangle-structure LED (45.33 mW). Eight hollow-runway LEDs connected in series are called hollow-runway-chip-array LEDs (HRCA-LEDs) and eight rectangle-structure LEDs connected in series are called rectangle-chip-array LEDs (RCA-LEDs), and they are fabricated into a new device on the same substrate. The f?3 dB and the optical power of the device are ~98.5 MHz and ~712.3 mW, respectively, at 50 mA. HRCA-LEDs are used as communication module that can provide data transmission and lighting and RCA-LEDs as a lighting module for enhancing the overall lighting capability of the device. Its luminous flux is 203.57 lm and efficacy is 87.00 lm/W at 50 mA.
关键词： electrical-to-optical (E-O) 3 dB bandwidth,visible-light communication,current-confined apertures,hollow-runway structure
更新于2025-09-23 15:19:57
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In-situ calibration technology of liquid level with precise laser ranging
摘要： This letter develops a distributed algorithm for relay pairing in bandwidth exchange (BE) based cooperative forwarding scenarios, where each node can delegate a fraction of its allocated resources to a neighboring node as an incentive for relaying. Determining the relay pairs that maximize the overall network utility yields a non-bipartite matching problem, which incurs a considerable computational load when implemented in a centralized way. To resolve this challenge, we use a message-passing framework to develop an efficient distributed solution. Simulation results verify that the proposed algorithm outperforms existing approaches.
关键词： bandwidth exchange,message passing algorithm,Affinity propagation,cooperative forwarding
更新于2025-09-23 15:19:57
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Influence of wavelength on the bandwidth of W-type plastic-clad silica optical fibers
摘要： The bandwidth and steady-state loss of multimode W-type plastic-clad silica optical fibers are investigated by solving the time-dependent power flow equation. The results show how the bandwidth of W-type plastic-clad silica optical fibers can be enhanced by shifting from the red to the infrared wavelength region for different intermediate layer widths and refractive indices of the outer cladding. Such characterization of these fibers is consistent with their manifest effectiveness in reducing modal dispersion and increasing bandwidth.
关键词： steady-state loss,power flow equation,bandwidth,infrared wavelength region,W-type plastic clad silica optical fiber
更新于2025-09-23 15:19:57
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[IEEE 2019 Innovations in Power and Advanced Computing Technologies (i-PACT) - Vellore, India (2019.3.22-2019.3.23)] 2019 Innovations in Power and Advanced Computing Technologies (i-PACT) - A Survey on Efficient Converter Driver Techniques for LED LIGHTING Applications
摘要： This letter develops a distributed algorithm for relay pairing in bandwidth exchange (BE) based cooperative forwarding scenarios, where each node can delegate a fraction of its allocated resources to a neighboring node as an incentive for relaying. Determining the relay pairs that maximize the overall network utility yields a non-bipartite matching problem, which incurs a considerable computational load when implemented in a centralized way. To resolve this challenge, we use a message-passing framework to develop an efficient distributed solution. Simulation results verify that the proposed algorithm outperforms existing approaches.
关键词： bandwidth exchange,message passing algorithm,Affinity propagation,cooperative forwarding
更新于2025-09-23 15:19:57
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High-Performance Germanium Waveguide Photodetectors on Silicon
摘要： Germanium waveguide photodetectors with 4 ??m widths and various lengths are fabricated on silicon-on-insulator substrates by selective epitaxial growth. The dependence of the germanium layer length on the responsivity and bandwidth of the photodetectors is studied. The optimal length of the germanium layer to achieve high bandwidth is found to be approximately 8 ??m. For the 4 × 8 ??m2 photodetector, the dark current density is as low as 5 mA/cm2 at ?1 V. At a bias of ?1 V, the 1550 nm optical responsivity is as high as 0.82 A/W. Bandwidth as high as 29 GHz is obtained at ?4 V. Clear opened eye diagrams at 50 Gbits/s are demonstrated at 1550 nm.
关键词： responsivity,Germanium waveguide photodetectors,silicon-on-insulator substrates,selective epitaxial growth,bandwidth
更新于2025-09-23 15:19:57