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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • filtering responses
  • compact size
  • substrate integrated waveguide (SIW)
  • Balun and balanced circuits
应用领域
  • Electronic Science and Technology
机构单位
  • South China University of Technology
41 条数据
?? 中文（中国） ▾

  • [IEEE 2019 Workshop on Recent Advances in Photonics (WRAP) - Guwahati, India (2019.12.13-2019.12.14)] 2019 Workshop on Recent Advances in Photonics (WRAP) - Study of temperature and hydrostatic pressure effect on SHG associated with the excitonic system in an InN Quantum dot

    摘要： A key problem in wireless mesh networks is forwarding packets to/from one or more gateways with connectivity to the Internet. In this respect, a short link schedule, which determines the transmission time of links, is critical. To date, existing link schedulers do not consider routers that incorporate advances in multiple input multiple output communications, i.e., interference cancellation and spatial multiplexing. In particular, these routers are able to transmit or receive distinct packets on all their links concurrently as well as deliver multiple packets to a neighbor simultaneously. To this end, we consider the problem of deriving a time division multiple access schedule that forwards packets to their respective destination quickly. We ?rst consider the personalized broadcast problem, which assumes a single gateway and present Algo-PB, a solution that produces a schedule that is within 34.5% of the lower bound, and is 45.5% shorter than those computed by the state-of-the-art algorithms. We then extend the problem to consider multiple gateways. This so-called forest construction problem is modeled as an integer linear program (ILP). We then outline Algo-FC, a novel heuristic that generates a balanced forest by repeatedly picking a node from the heaviest tree and migrating it to another tree if doing so reduces the overall load. Experiment results show that the resulting forest generated by Algo-FC is within 9.1% of the ILP solution.

    关键词： Link scheduler,multiple gateways,balanced tree,NP-complete,integer linear program (ILP)

    更新于2025-09-19 17:13:59

  • [IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Nonlinear Equivalent Resistance-based Maximum Power Point Tracking (MPPT)

    摘要： A key problem in wireless mesh networks is forwarding packets to/from one or more gateways with connectivity to the Internet. In this respect, a short link schedule, which determines the transmission time of links, is critical. To date, existing link schedulers do not consider routers that incorporate advances in multiple input multiple output communications, i.e., interference cancellation and spatial multiplexing. In particular, these routers are able to transmit or receive distinct packets on all their links concurrently as well as deliver multiple packets to a neighbor simultaneously. To this end, we consider the problem of deriving a time division multiple access schedule that forwards packets to their respective destination quickly. We ?rst consider the personalized broadcast problem, which assumes a single gateway and present Algo-PB, a solution that produces a schedule that is within 34.5% of the lower bound, and is 45.5% shorter than those computed by the state-of-the-art algorithms. We then extend the problem to consider multiple gateways. This so-called forest construction problem is modeled as an integer linear program (ILP). We then outline Algo-FC, a novel heuristic that generates a balanced forest by repeatedly picking a node from the heaviest tree and migrating it to another tree if doing so reduces the overall load. Experiment results show that the resulting forest generated by Algo-FC is within 9.1% of the ILP solution.

    关键词： integer linear program (ILP),multiple gateways,NP-complete,Link scheduler,balanced tree

    更新于2025-09-19 17:13:59

  • COMPACT SINGLE-LAYER BALANCED EIGHTH-MODE SUBSTRATE INTEGRATED WAVEGUIDE BANDPASS FILTER WITH HIGH SELECTIVITY

    摘要： This letter proposes a compact single-layer balanced bandpass ?lter (BPF), which is realized by a new arrangement of eighth-mode substrate integrated waveguide (EMSIW) cavities. Under di?erential-mode (DM) operation, the half bisection topology of the proposed EMSIW ?lter can be equivalent to a quadruplet scheme based on four coupled EMSIW cavities. The negative cross coupling can be easily realized by the nature of the fringe electric ?elds of opened ends of EMSIW cavities. For the demonstration, a balanced EMSIW ?lter with the operating frequency at 2.4 GHz is designed, fabricated, and measured.

    关键词： eighth-mode substrate integrated waveguide,compact size,high selectivity,balanced bandpass filter

    更新于2025-09-19 17:13:59

  • [IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - A Traffic-Balanced and Thermal-Fault Tolerant Routing Algorithm for Optical Network-on-Chip

    摘要： How to make efficient data routing is one of the key points in optical network-on-chip. Traditional routing algorithms solve deadlocks by prohibiting turns. However, it cannot provide uniform adaptiveness in optical network-on-chip, which results in unbalanced traffic as well as thermal-faulty nodes and thereby degrades the network performance. To achieve traffic balancing and thermal-fault tolerant, a traffic-balanced and thermal-fault tolerant routing algorithm (TBTFTA) is proposed in this paper which considers traffic and temperature information simultaneously. TBTFTA can handle the congestion and different types of thermal-faulty nodes by a distributed path selection strategy. Simulation based on OPNET is carried out to evaluate the proposed algorithm. The results show a lower latency and an improved throughput by 37.39%, 43.62%, and 49.32% compared with the traditional algorithm under various traffic patterns.

    关键词： Thermal,Routing Algorithm,Traffic-balanced,Optical Network-on-Chip

    更新于2025-09-16 10:30:52

  • Passive, Broadband, and Low-Frequency Suppression of Laser Amplitude Noise to the Shot-Noise Limit Using a Hollow-Core Fiber

    摘要： Reducing noise to the shot-noise limit is a challenge for laser development for ultrasensitive applications in precision sensing and fundamental science. We use hollow-core ?ber in a collinear-balanced-detection scheme to suppress 2.6 dB of amplitude noise to within 0.01 dB of the shot-noise limit, while simultaneously preserving the spectrum and temporal pro?le of picosecond laser pulses. We also provide an enhanced version of the scheme that concatenates multiple circuits for suppression over many frequencies and broad frequency ranges. We perform a ?rst demonstration of this method and reduce total excess amplitude noise, between 2 and 6 MHz, by 85%. These demonstrations enable passive, broadband, all-guided ?ber-laser technology operating at the shot-noise limit.

    关键词： shot-noise limit,collinear-balanced-detection,laser amplitude noise,hollow-core fiber,noise suppression

    更新于2025-09-12 10:27:22

  • [IEEE 2019 34th Symposium on Microelectronics Technology and Devices (SBMicro) - Sao Paulo, Brazil (2019.8.26-2019.8.30)] 2019 34th Symposium on Microelectronics Technology and Devices (SBMicro) - Study on the Influence of the Luminescence Coupling in Dual Junction Solar Cells

    摘要： The multijunction solar cell concept has proven to be a very efficient way of converting solar into electrical energy. Theoretical calculations using the detailed balance model aim in the optimization process of finding the best materials (in terms of bandgap energies) to compose the device junctions. However, along with other simplifications, such model applied to multijunction solar cells fails in considering one important physical effect: the luminescence coupling amongst the junctions. In this work, we present a method based on a self-consistent numerical approach for implementing the luminescence coupling in the detailed balance model applied to multijunction solar cells. We show results on the influence of the effect on the performance of different dual junction solar cells in which a coupling factor and the junction bandgap energies are varied. Therefore, we show that the main impact of the luminescence coupling is in the raise of the solar cell short circuit current, and consequently, their conversion efficiencies. Moreover, we highlight that the influence of the effect is more important for the bandgap energy combinations that would lead to low efficiencies. This is an important result towards the choice of materials by allowing more combinations to achieve high efficiencies.

    关键词： Luminescence Coupling,Detailed Balanced Model,Theoretical Calculation,Multijunction Solar Cells

    更新于2025-09-12 10:27:22

  • [IEEE 2018 International Applied Computational Electromagnetics Society Symposium - China (ACES) - Beijing, China (2018.7.29-2018.8.1)] 2018 International Applied Computational Electromagnetics Society Symposium - China (ACES) - Novel Compact Substrate Integrated Waveguide Balun Filter and Balanced Filter

    摘要： In this paper, we present a balun filter and a balanced filter based on substrate integrated waveguide (SIW). By fully utilizing the EM-field properties, only one SIW cavity is needed to realize the presented second-order balun or balanced filter. After properly arranging the locations of input/output ports in a TE102 and TE201 orthogonal modes SIW cavity, the desired 180o phase difference of balun or balanced filter can be obtained. Hence, filtering responses can be easy integrated to the balun or balanced circuits. The design methods of the two circuits are presented. For demonstration, a balanced filter is fabricated and measured. Good agreement between simulated and measured results verifies the proposed ideas.

    关键词： filtering responses,compact size,substrate integrated waveguide (SIW),Balun and balanced circuits

    更新于2025-09-11 14:15:04

  • Compact Balanced Substrate Integrated Waveguide Filter with Low Insertion Loss

    摘要： A balanced substrate integrated waveguide (SIW) ?lter is proposed by etching transverse slots on the top surface. The SIW structures between each two adjacent slots are resonators operating at TE20δ mode for differential-mode (DM) operation and at TE10δ and TE30δ modes for common-mode (CM) operation. The proposed TE20δ-mode resonator is much shorter than the traditional TE201-mode resonator, which causes the whole design to be compact and low loss. Furthermore, the strong electric coupling formed by slots make it have wider bandwidth when compared with the state-of-the-arts. A prototype is designed at 3.5 GHz with the size of 1.2λd× 0.83λd (λd is the wavelength in dielectric at the center frequency), the minimum insertion loss of 0.91 dB, the 3-dB fractional bandwidth (FBW) of 16%, and the FBW for 20 dB CM suppression of 79%.

    关键词： low loss,TE20δ mode,substrate integrated waveguide (SIW),compact,Balanced ?lter

    更新于2025-09-11 14:15:04

  • An Integrated Photonic Electric-Field Sensor Utilizing a 1 × 2 YBB Mach-Zehnder Interferometric Modulator with a Titanium-Diffused Lithium Niobate Waveguide and a Dipole Patch Antenna

    摘要： We studied photonic electric-?eld sensors using a 1 × 2 YBB-MZI modulator composed of two complementary outputs and a 3 dB directional coupler based on the electro-optic e?ect and titanium di?used lithium–niobate optical waveguides. The measured DC switching voltage and extinction ratio at the wavelength 1.3 μm were ~16.6 V and ~14.7 dB, respectively. The minimum detectable ?elds were ~1.12 V/m and ~3.3 V/m, corresponding to the ~22 dB and ~18 dB dynamic ranges of ~10 MHz and 50 MHz, respectively, for an rf power of 20 dBm. The sensor shows an almost linear response to the applied electric-?eld strength within the range of 0.29 V/m to 29.8 V/m.

    关键词： titanium di?used optical channel waveguide,lithium–niobate electro-optic e?ect,photonic electric-?eld sensor,Y-fed balanced-bridge Mach-Zehnder interferometer (YBB-MZI)

    更新于2025-09-11 14:15:04

  • [IEEE 2019 IEEE Avionics and Vehicle Fiber-Optics and Photonics Conference (AVFOP) - Arlington, VA, USA (2019.11.5-2019.11.6)] 2019 IEEE Avionics and Vehicle Fiber-Optics and Photonics Conference (AVFOP) - Measurements and Discussion of a Balanced Photonic Link Utilizing Dual-Core Optical Fiber

    摘要： The use of dual-core optical fibers in balanced photonic links is explored. The gain and noise performance improvements are demonstrated. The optical crosstalk is measured as a function of frequency, and the balanced phase tolerance as a function of temperature is discussed.

    关键词： photonic links,balanced detection,dual-core fiber

    更新于2025-09-11 14:15:04