Search results for: Xiupu Zhang

Items from 1 to 20 out of 120 results

article

Twin nonlinearity generator‐based analog predistorter for small‐cell power amplifiers

Gaoming Xu, Li Huang, Taijun Liu, Xiupu Zhang

International Journal of RF and Microwave Computer‐Aided Engineering > 32 > 12 > n/a - n/a

In this article, a simple analog predistorter (APD), named twin nonlinearity generator based APD (TNG‐APD) using the pseudomorphic high electron mobility transistor (pHEMT), is proposed for linearizing small‐cell radio frequency power amplifiers (RFPAs) in the fifth‐generation mobile communication system (5G). The TNG‐APD is composed of two cascaded common‐source field effect transistors (FETs) and...

article

Bandstop filtering for integrated substrate gap waveguide high‐gain and wideband slot antenna for 5G

Jianpei Chen, Dongya Shen, Xiupu Zhang

International Journal of RF and Microwave Computer‐Aided Engineering > 32 > 9 > n/a - n/a

Slot antenna based on microstrip line and waveguide is a popular design for future 5G antennas. To improve performance of slot antenna, a high‐gain wideband slot antenna based on integrated substrate gap waveguide (ISGW) is presented, in which a stepped impedance feeding line is adopted to broaden bandwidth, and ISGW is used to increase gain. First, the transmission characteristics and the effective...

article

Integrated substrate groove gap waveguide and application for filter design

Jianpei Chen, Dongya Shen, Xiupu Zhang, Yuchao Sa

International Journal of RF and Microwave Computer‐Aided Engineering > 31 > 11 > n/a - n/a

In this article, an integrated substrate groove gap waveguide (Integrated‐SGGW) is proposed, which is composed of gap and groove layer in printed circuit board technology, which is considered a highly integrated circuit design technology. Electromagnetic wave is transmitted via the dielectric groove in transverse electric mode. Firstly, the waveguide is analyzed, including dispersion characteristics,...

article

Characteristic impedance of integrated substrate gap waveguide

Yuchao Sa, Dongya Shen, Xiupu Zhang

International Journal of RF and Microwave Computer‐Aided Engineering > 31 > 8 > n/a - n/a

A theoretical method is presented by which characteristic impedance of integrated substrate gap waveguide (ISGW) is analyzed. The method is essentially based on a variational function for the transmission‐line capacitance in Fourier‐transformed domain with test/trial functions of charge density distribution, in which transverse transmission‐line Green's function is used to facilitate the variational...

article

Hybrid harmonic‐intermodulation distortion behavioral model for shortwave power amplifiers

Gaoming Xu, Taijun Liu, Yan Ye, Xiupu Zhang

International Journal of RF and Microwave Computer‐Aided Engineering > 29 > 7 > n/a - n/a

In this article, a hybrid harmonic‐intermodulation distortion (HHIMD) behavioral model is proposed for imitating the shortwave power amplifier (SWPA) behavioral distortion, that is, harmonic distortion, intermodulation distortion, and memory effect. The proposed model is composed of an intermodulation distortion module, a quadrature digital up‐converter module and a harmonic distortion module. To...

article

Broadband linearization for 5G fronthaul transmission

Xiupu Zhang

Frontiers of Optoelectronics > 2018 > 11 > 2 > 107-115

5G is emerging, but the current fronthaul transmission technologies used for 3G and 4G may not be efficient and appropriate for 5G. It has been found that frequency division multiple access (FDMA) and time-division multiple access (TDMA) based radio over fiber (RoF) may be considered the most appropriate for 5G fronthaul transmission technology. Due to analog RoF transmission, broadband linearization...

article

Fabrication of a LP01 to LP02 mode converter embedded in bulk glass using femtosecond direct inscription

Hakim Mellah, Jean-Philippe Bérubé, Réal Vallée, Xiupu Zhang

Optics Communications > 2018 > 410 > C > 475-478

In this paper, we demonstrate a fabrication of an integrated mode converter that converts LP₀₁ to LP₀₂ for the C-band. The mode converter was directly inscribed in the bulk of a borosilicate glass using a femtosecond laser. The converter has an insertion loss of less than 1 dB for the entire C-band, suggesting more than 80% conversion efficiency.

article

Wavelength Blue-Shifting and Gain Spectral Bandwidth of InAs/InP Quantum Dots for Laser Applications Around $1.55~\mu$ m

Yiling Xiong, Xiupu Zhang

IEEE Journal of Quantum Electronics > 2018 > 54 > 1 > 1 - 9

It was found experimentally that growing an ultrathin GaP interlayer/sublayer before InAs quantum dots (QDs) grown on InGaAsP barrier lattice-matched to InP (001) substrates is an efficient way to tune the emission wavelength of InAs/InP QD lasers to

$1.55~\mu \text{m}$

range at room temperature (RT). However, the impact of interlayers/sublayers in InAs/InP QD lasers has not been carefully investigated...

article

An Accurate Method of Modeling Self-Assembled InAs/InGaAsP/InP (001) Quantum Dot With Double-Capping Procedure

Yiling Xiong, Xiupu Zhang

IEEE Journal of Quantum Electronics > 2017 > 53 > 6 > 1 - 11

The double-capping procedure has been widely used to control the size distribution of self-assembled InAs/InGaAsP quantum dots during the growth on a (001) InP substrate. However, the conventional simulation method referred to one-step model does not include this procedure, which may lead to inaccuracy in modeling of quantum dots. An accurate method of modeling a single quantum dot including a thorough...

chapter

A novel self-packaged microstrip line

Jing Zhang, Xiupu Zhang, Ahmed A. Kishk

2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS) > 1 - 2

2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)

A new low-loss quasi-transverse electromagnetic (TEM) microstrip line, called as a self-packaged microstrip line, is proposed for microwave and millimeter-wave applications. It is fully based on the low-cost PCB process, but without the issues of radiation and surface waves by using a top layer perfect magnetic conductor (PMC) substrate. The self-packaged microstrip line consists of three layer substrates:...

chapter

A new all-fiber LP₀₁/LP₀₂ mode converter in mode division multiplexing

Dongya Shen, Chuan Ma, Changhui Wan, Hong Yuan, more

2017 16th International Conference on Optical Communications and Networks (ICOCN) > 1 - 3

2017 16th International Conference on Optical Communications and Networks (ICOCN)

In this paper, a new all-fiber mode converter was proposed, which can achieve LP₀₁ to LP₀₂ mode conversion and vice versa. The proposed mode converter is based on a tapered core and four bipyramids combined structure with annular distribution; the tapered core is used to excite the high-order modes while the bipyramids combined structure curb the undesired high-order modes and make the LP02 dominate...

article

Simple optical frequency comb generation using a passively mode-locked quantum dot laser

Li Liu, Xiupu Zhang, Tiefeng Xu, Zhenxiang Dai, more

Optics Communications > 2017 > 396 > C > 105-109

A simple and quasi-tunable optical frequency comb (OFC) generator is proposed and experimentally demonstrated using a C-band passively Fabry-Pérot quantum dot mode-locked laser and a dual-driven LiNbO₃ Mach–Zehnder modulator. A 16-nm bandwidth OFC with 81, 58 and 30 comb lines at frequency interval of 23.3GHz, 35GHz and 70GHz respectively is obtained experimentally. Measured average optical signal...

article

Uni-Traveling-Carrier Photodetector With High-Reflectivity DBR Mirrors

Qingtao Chen, Yongqing Huang, Xiupu Zhang, Xiaofeng Duan, more

IEEE Photonics Technology Letters > 2017 > 29 > 14 > 1203 - 1206

A novel uni-traveling-carrier photodetector (UTC-PD), bonded to high-reflectivity (HR) distributed Bragg reflector (DBR) mirrors, referred to as HR-UTC-PD, is first developed to overcome the bandwidth-responsivity tradeoff in UTC-PDs at various wavelengths. Grubbs’ test is adopted, for the first time, to measure the bonded thickness of random locations for evaluating the reflected light loss generated...

article

Study of Bend Discontinuities in Substrate Integrated Gap Waveguide

Jing Zhang, Xiupu Zhang, Ahmed A. Kishk

IEEE Microwave and Wireless Components Letters > 2017 > 27 > 3 > 221 - 223

This letter presents a study of bend discontinuities in the substrate integrated gap waveguide (SIGW), and proposes a simple solution to minimize the discontinuity effects. Both curved and chamfered right-angle bends are studied. It is found that with a proper ratio of the chamfered length and the bend via diameter, the possible cavity resonances can be suppressed and the desired performance is achieved...

article

Packaged Microstrip Line: A New Quasi-TEM Line for Microwave and Millimeter-Wave Applications

Jing Zhang, Xiupu Zhang, Dongya Shen, Ahmed A. Kishk

IEEE Transactions on Microwave Theory and Techniques > 2017 > 65 > 3 > 707 - 719

In this paper, a new quasi-transverse electromagnetic (TEM) microstrip line, named as packaged microstrip line, is proposed for microwave and millimeter-wave applications. It is comprised of three dielectric substrates: a base layer to place the metal strip, a top layer to build the perfect magnetic conductor (PMC) shielding with periodic plated vias, and a middle layer to separate the PMC layer from...

article

Mach-Zehnder modulator modulated radio-over-fiber transmission system using dual wavelength linearization

Ran Zhu, Ming Hui, Dongya Shen, Xiupu Zhang

Optics Communications > 2017 > 385 > C > 229-237

In this paper, dual wavelength linearization (DWL) technique is studied to suppress odd and even order nonlinearities simultaneously in a Mach-Zehnder modulator (MZM) modulated radio-over-fiber (RoF) transmission system. A theoretical model is given to analyze the DWL employed for MZM. In a single-tone test, the suppressions of the second order harmonic distortion (HD2) and third order harmonic distortion...

chapter

A novel multiple-stub ultra-wide band antenna

Yanni Cui, Qiong Zhou, Xiupu Zhang, Dongya Shen, more

2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT) > 229 - 232

2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)

This paper proposes a novel multi-stub ultra-wide band planar monopole antenna. The radiation patch of the antenna is composed of a pair of back-to-back E-shape-like stub elements. The E-shape-like stub element is the extension of the E-shape stub element, adding two semi-circle elements at the back of the E-shape stub element and extending the top of the E-shape stub element with an inverted L-shape...

article

Investigation of broadband digital predistortion for broadband radio over fiber transmission systems

Xiupu Zhang, Taijun Liu, Dongya Shen

Optics Communications > 2016 > 381 > C > 346-351

In future broadband cloud radio access networks (C-RAN), front-haul transmission systems play a significant role in performance and cost of C-RAN. Broadband and high linearity radio over fiber (RoF) transmission systems are considered a promising solution for the front-haul. Digital linearization is one possible solution for RoF front-haul. In this paper, we investigate RF domain digital predistortion...

article

Analog Pre-Distortion Circuit for Radio Over Fiber Transmission

Xiupu Zhang, Shuvasish Saha, Ran Zhu, Taijun Liu, more

IEEE Photonics Technology Letters > 2016 > 28 > 22 > 2541 - 2544

This letter presents a novel analog predistortion circuit based on two Schottky diodes that can suppress both the third- and fifth-order nonlinear distortions simultaneously. This circuit is simple, of low cost, and of low power consumption. The predistortion circuit is verified in two radio over fiber (RoF) transmission systems. It is shown that spurious free dynamic range is improved significantly...

article

Ultra Broadband Predistortion Circuit for Radio-over-Fiber Transmission Systems

Ran Zhu, Xiupu Zhang, Dongya Shen, Ye Zhang

Journal of Lightwave Technology > 2016 > 34 > 22 > 5137 - 5145

A dual Schottky diode-based ultrabroadband predistortion circuit (PDC) is designed and experimentally verified to linearize both directly and externally modulated radio-over-fiber (RoF) transmission systems. A monolithic dual Schottky diode is used in the PDC to reduce the footprint and improve the bandwidth. The measured S-parameters show that the circuit is able to work for up to 40 GHz. The theory...

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INFONA - science communication portal

Search results for: Xiupu Zhang

Twin nonlinearity generator‐based analog predistorter for small‐cell power amplifiers

Bandstop filtering for integrated substrate gap waveguide high‐gain and wideband slot antenna for 5G

Integrated substrate groove gap waveguide and application for filter design

Characteristic impedance of integrated substrate gap waveguide

Hybrid harmonic‐intermodulation distortion behavioral model for shortwave power amplifiers

Broadband linearization for 5G fronthaul transmission

Fabrication of a LP01 to LP02 mode converter embedded in bulk glass using femtosecond direct inscription

Wavelength Blue-Shifting and Gain Spectral Bandwidth of InAs/InP Quantum Dots for Laser Applications Around $1.55~\mu$ m

An Accurate Method of Modeling Self-Assembled InAs/InGaAsP/InP (001) Quantum Dot With Double-Capping Procedure

A novel self-packaged microstrip line

A new all-fiber LP₀₁/LP₀₂ mode converter in mode division multiplexing

Simple optical frequency comb generation using a passively mode-locked quantum dot laser

Uni-Traveling-Carrier Photodetector With High-Reflectivity DBR Mirrors

Study of Bend Discontinuities in Substrate Integrated Gap Waveguide

Packaged Microstrip Line: A New Quasi-TEM Line for Microwave and Millimeter-Wave Applications

Mach-Zehnder modulator modulated radio-over-fiber transmission system using dual wavelength linearization

A novel multiple-stub ultra-wide band antenna

Investigation of broadband digital predistortion for broadband radio over fiber transmission systems

Analog Pre-Distortion Circuit for Radio Over Fiber Transmission

Ultra Broadband Predistortion Circuit for Radio-over-Fiber Transmission Systems

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