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Despite the high phase non-linearity of a Silicon Mach-Zehnder Modulator in forward bias, we demonstrate that high third order spur-free dynamic range ~102.8 dB. Hz2/3 can be obtained by optimizing the D.C. bias operating point at 1 GHz.
We experimentally examine a modulation-induced phase drift in depletion-mode silicon phase modulator and Mach-Zehnder modulator. The impact on BPSK signal is studied under varying modulator operating conditions.
Fully-integrated photonic microwave tracking generators are demonstrated for the first time. By sweeping the wavelength separation among two-locked DFBs and one tunable laser, a two-tone photo-generated RF signal with tunable difference in frequency can be generated. 2017 Optical Society of America
An extended linear cavity single-frequency fiber laser at 2 μm was investigated using Tm-doped fiber as saturable absorber. More than 60 mW laser power was achieved with the linewidth of ∼40 kHz.
This paper presents an electrical parameter estimation method of the main-circuit insulation test for 1100kV gas insulated switchgear (GIS) equipment in order to realize the rationality of the test segmentation, equipment selection and parameter matching. First, the test method of main-circuit insulation is given. Then, the methods of estimating test capability of the variable-frequency series-resonant...
In order to meet the needs of large capacity, long distance power transmission and nationwide power grid interconnection, China is making great efforts to develop UHV transmission project. Switching overvoltage directly influences the construction cost and operation reliability of UHV transmission system, how to reduce the switching overvoltage deeply is one of the key technical problems that need...
While metric learning is important for Person reidentification (RE-ID), a significant problem in visual surveillance for cross-view pedestrian matching, existing metric models for RE-ID are mostly based on supervised learning that requires quantities of labeled samples in all pairs of camera views for training. However, this limits their scalabilities to realistic applications, in which a large amount...
In order to meet the needs of smart distribution grid evaluation in different regions and different information integrity systems, this paper presents a comprehensive evaluation system (CES) based on analytic hierarchy process (AHP) and adaptive correction method. First, a hierarchical frame structure of the CES is put forward. Then, a detailed design of the comprehensive evaluation index system (CEIS)...
This Polyimide film has excellent electrical properties and it serves as an important insulating material which is widely used in the variable-frequency motor and wind generator. Since high temperature is a significant reason for degradation in insulation, the space charge distributions of polyimide (PI) films in high temperature condition is worth investigating. Under different temperature, the conductivity...
We propose a novel scheme using a microring resonator (MRR) structure in silicon photonics (SiP) for the elimination of signal-to-signal beat interference (SSBI) in a direct detection, optical orthogonal frequency division multiplexing (DDO-OFDM) system. Unlike other SSBI cancellation techniques, SiP-based MRR shows unique advantages such as compactness and low cost. We examine performance as a function...
By use of Zn-diffusion and oxide-relief apertures in 940 nm VCSEL, state-of-the-art dynamic performance has been demonstrated. A low differential resistance (50 Ω) and a near 30 GHz 3-dB E-O bandwidth can be sustained from room-temperature to 85°C operations.
We review our work on GaN high-speed LEDs. By optimizing MQWs structure in our device, record-high data rates (5.5 Gbit/sec) over POF among all visible LEDs can be achieved. Besides, a high-lumens, high-CRI (95), and high-speed white-light LED has been demonstrated for indoor VLC.
Person re-identification (Re-ID) is an important problem in video surveillance, aiming to match pedestrian images across camera views. Currently, most works focus on RGB-based Re-ID. However, in some applications, RGB images are not suitable, e.g. in a dark environment or at night. Infrared (IR) imaging becomes necessary in many visual systems. To that end, matching RGB images with infrared images...
With rich reserves and unique advantages, offshore wind resources has become an important development direction for the future wind power generation. However, since the characteristics of offshore wind power are different from that of onshore wind power, many key issues need further study, especially the probability of offshore wind turbine suffering from lightning strike is large, resulting in a...
Environmental sound classification task (ESC) is still open and challenging. In contrast to speech, sounds of a specific acoustic event may be produced by a wide variety of sources. Thus for one class, feature spectrums of acoustic events are much more transformative than human speech. In order to learn better high-level feature representations from these transformative feature spectrums, convolution...
Rather than simply recognizing the action of a person individually, collective activity recognition aims to find out what a group of people is acting in a collective scene. Previous state-of-the-art methods using hand-crafted potentials in conventional graphical model which can only define a limited range of relations. Thus, the complex structural dependencies among individuals involved in a collective...
In this paper we proposed an aperture coupled patch antenna array with hyperbolic dielectric lens at 6.45GHz. The structure of the aperture coupled provides narrow bandwidth and a hyperbolic lens is used to focus the beam from the patch antenna in the forward direction resulting in higher realized gain. Comparing with the traditional patch antenna array without a hyperbolic lens, this proposed antenna...
In this paper a multi-band loop antenna for 4G-LTE mobile phone application was proposed. The antenna has a compact volume of 60×6×5mm3 and covering 824–960, 1710–2530, 3400–3800 MHz with over 60% simulated efficiency.
A triple-band hybrid-mode GPS/WLAN antenna for mobile phone with full metal housing is proposed. The proposed antenna is formed of a feeding strip and a grounding strip. By further integrating the antenna strips with an electromagnetic cavity, antenna modes and cavity modes can be combined to generate more resonances with enhanced impedance bandwidth and improved antenna efficiency. The total efficiency...
Composite function minimization captures a wide spectrum of applications in both computer vision and machine learning. It includes bound constrained optimization and cardinality regularized optimization as special cases. This paper proposes and analyzes a new Matrix Splitting Method (MSM) for minimizing composite functions. It can be viewed as a generalization of the classical Gauss-Seidel method...
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