Results 241 to 250 of about 5,893,470 (283)
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Photonic approach to flexible multi-band linearly frequency modulated microwave signals generation
Optics Letters, 2021In this paper, a flexible multi-band linearly frequency modulated (LFM) signal generator based on a dual-polarization binary phase-shift keying (DP-BPSK) modulator is proposed and demonstrated by experiment. Two dual-drive Mach–Zehnder modulators of the DP-BPSK modulator are driven by a local oscillator (LO) signal and an LFM signal,
Yuan, Men +3 more
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Research on Multi-Band Fiber Transmission System With Multi-Carrier and Adaptive Modulation
2021 19th International Conference on Optical Communications and Networks (ICOCN), 2021In this paper, a novel multi-band transmission system based on multi-carrier and adaptive modulation is proposed. The simulation results show that the scheme can effectively improve the performance of system.
Leijing Yang, Qinghua Tian, Xiangjun Xin
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Low-profile broadband Core-Isolator for multi-band module
2011 IEEE MTT-S International Microwave Symposium, 2011A novel broadband Core-Isolator for modules of multi-standard and multi-band mobile handsets has been developed successfully. A new circuit configuration for extending the isolation frequency band is proposed. The equations of the insertion loss and the isolation bandwidth of a two-port isolator with resonant elements are derived from equivalent ...
Takaya Wada +3 more
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Multi-Band RF Downconversion Over Fiber With a Single Modulator
IEEE Photonics Technology Letters, 2018We present the theory for an experimental verification of a new technique to combine multiple microwave signals populating a wide spectrum into a single, small band for further relay or processing. The method is an extension of well-known RF-over-fiber downconversion techniques but with multiple local oscillators (LOs) to translate widely spaced ...
Bryan M. Haas, Jason D. McKinney
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Generation and transmission of phase-stable coherent multi-band linear frequency modulated signals
Optics Letters, 2021We present a coherent multi-band linear frequency modulated (LFM) signal generation and transmission system based on dual optical frequency combs (OFCs). In the proposed scheme, the two OFCs are phase-locked to ensure high coherence of the generated multi-band LFM signals.
Baiyu Li +4 more
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Modulation of a multi-band tunable metamaterial with metal disk array
Optical Materials, 2020Abstract A multi-band metamaterial with vanadium dioxide (VO2) layer is proposed, manufactured, and measured in the terahertz (THz) band. Two absorption peaks (P1 and P2) are excited at 33.88 THz (60% amplitude, and 0.7 THz full width at half maximum (FWHM)) and 37.94 THz (76% amplitude, and 1.62 THz FWHM) at room temperature. The P1 peak is achieved
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Multi-band printed monopole antenna for ubiquitous module in mobile station
2nd European Conference on Antennas and Propagation (EuCAP 2007), 2007Current mobile communication systems in W-CDMA systems are assigned three frequency bands in Japan. We present and investigate a multi-resonant printed monopole antenna (80×120×1.6 mm3) for a small wireless packet communication module (called a ubiquitous communication module).
Y. Kimura, Y. Ebine, T. Imai
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Balanced SiGe PA Module for Multi-Band and Multi-Mode Cellular-Phone Applications
2008 IEEE International Solid-State Circuits Conference - Digest of Technical Papers, 2008In this paper, the integration of a MM (GSM/EDGE/WCDMA) MB (850/900MHz, 1800/1900/2100MHz) 50 Omega-matched isolator-less flip-chip PAs, capable of envelope and power tracking operation, is discussed. The PAs are integrated in a 0.25 mum SiGe technology and are soldered on a 4-layer substrate. The system is hosted in a 6 x 8 mm2 plastic module.
Antonino Scuderi +4 more
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Advanced multi-band modulation schemes for high speed data center optical interconnects
2016 25th Wireless and Optical Communication Conference (WOCC), 2016A 56 Gb/s multi-band CAP link with zero overhead signal recovery and enhanced timing jitter tolerance is demonstrated for intra- and inter-data center optical interconnects. It is the first examination of a 56-Gb/s Multi-band CAP signal transmission over 80 km SMF in terms of OSNR performance and chromatic dispersion tolerance.
Jinlong Wei, Helmut Griesser
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A comparison of different module configurations for multi-band-gap solar cells
Solar Cells, 1988Abstract The use of different module configurations with multijunction (MJ) solar cells was investigated. Module configuration refers to the electrical circuit in which the subcells of the MJ cell are connected. The simplest configuration has the subcells connected in series.
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