Search Results - Jian Dai
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Sealing - Treatment Repair Technology of Cast Magnesium Alloy Shell Parts
Published 2021-03-01Get full textDue to the various degrees of internal defects (e.g. shrinkage, corroded points) in cast magnesium alloy shell, the fluid is easy to leakage. This kind of leakage has the characteristics of small leakage, many leakage points and difficulties to accurate locating position. Therefore, it is hard to so...
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Efficient Optical Spatial First-Order Differentiator Based on Graphene-Based Metalines and Evolutionary Algorithms
Published 2020-01-01Get full textWe propose a novel optical spatial differentiator to perform the differentiation computation in terahertz region based on the graphene metalines, which consist of graphene layers with different widths and chemical potentials. The numerical simulation results show that when beam waist size w>1...
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Frequency-Oriented Subsampling by Photonic Fourier Transform and I/Q Demodulation
Published 2017-01-01Get full textSubsampling can directly acquire a passband within a broad radio frequency (RF) range, avoiding down-conversion and low-phase-noise tunable local oscillation. However, subsampling suffers from band folding and self-image interference. In this paper, we propose a frequency-oriented subsampling to sol...
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Microwave Photonic Frequency Up-Convertor With Frequency Doubling and Compensation of Chromatic-Dispersion-Induced Power Fading
Published 2017-01-01Get full textA novel photonic frequency-doubling up-convertor with compensation of chromatic-dispersion-induced power fading is proposed and experimentally demonstrated based on the cascaded structure of a Mach–Zehnder modulator (MZM) and a dual-parallel Mach–Zehnder modulator (DPMZM). The...
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A Broadband, Rectangular, and Self-Sustained Optical Frequency Comb Generation Employing Recirculation Frequency Shifter
Published 2017-01-01Get full textTo generate a self-sustained rectangular optical frequency comb (OFC) with tunable spacing and bandwidth, we propose and experimentally demonstrate a novel scheme by using an optoelectronic oscillator employing recirculation frequency shifter (RFS) loop. In this scheme, the oscillating signal is sep...
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