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Study on a v-band signals and pulses generator with a tunable optical carrier to sideband ratio

Chinese Optics Letters 2017年第6期15卷 41-45页

作者：陈宏尧宁提纲李晶裴丽袁瑾温晓东 Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Institute of Lightwave TechnologyBeijing Jiaotong University College of Physics and Engineering Qufu Normal University

This Letter demonstrates a filterless v-band signals and pulses generator scheme with a tunable optical carrier to sideband ratio（OCSR）. Through complete theoretical analysis, the mathematical expression of the OCSR that contains the extinction ratio, phase modulation index, and bias angle is obtained. It is found that the OCSR has a wide tuning range, from 50 to-70 d B. By careful adjustment, a 60 GHz millimeter-wave signal with the OCSR at 50.72 d B and the electrical spurious suppression ratio at 36.6 d B can be achieved. Moreover, the discussions of using optimum OCSR to generate a Nyquist pulse or triangular-shaped pulse are also presented in this Letter.

关键词： tunable generator extinction triangular adjustment suppression tuning shaped careful millimeter

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Deep Cytometry: Deep learning with Real-time Inference in Cell Sorting and Flow Cytometry

arXiv

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arXiv 2019年

作者： Li, Yueqin Mahjoubfar, Ata Chen, Claire Lifan Niazi, Kayvan Reza Pei, Li Jalali, Bahram Department of Electrical & Computer Engineering University of California Los AngelesCA90095 United States California NanoSystems Institute Los AngelesCA90095 United States Key Lab of All Optical Network & Advanced Telecommunication Network Ministry of Education Institute of Lightwave Technology Beijing Jiaotong University Beijing100044 China NantWorks LLC Culver CityCA90232 United States Department of Bioengineering University of California Los AngelesCA90095 United States Department of Surgery UCLA Geffen School of Medicine Los Angeles United States

Deep learning has achieved spectacular performance in image and speech recognition and synthesis. It outperforms other machine learning algorithms in problems where large amounts of data are available. In the area of measurement technology, instruments based on the photonic time stretch have established record real-time measurement throughput in spectroscopy, optical coherence tomography, and imaging flow cytometry. These extreme-throughput instruments generate approximately 1 Tbit/s of continuous measurement data and have led to the discovery of rare phenomena in nonlinear and complex systems as well as new types Copyright © 2019, The Authors. All rights reserved.

关键词： Deep learning

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Frequency-doubled triangular shape lightwave generation with a flexible modulation index

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Chinese Optics Letters 2017年第9期15卷 56-60页

作者： Jing Li Ze Hao Li Pei Tigang Ning Jingjing Zheng Key Lab of All Optical Network&Advanced Telecommunication Network of EMC Beijing Jiaotong UniversityBeijing 100044China Institute of Lightwave Technology Beijing Jiaotong UniversityBeijing 100044China

An approach for full duty frequency-doubled triangle shape lightwave generation is proposed and *** requires a dual-parallel Mach–Zehnder modulator（DP-MZM） driven by a sinusoidal signal. A stop band filter is coupled to filter out two undesired sidebands. By tuning the bias voltage applied to the DP-MZM, the output optical intensity with a full duty cycle triangle shape profile can be obtained. It is found that the required modulation index is no longer a fixed one. It can vary within a range, without degrading the target waveform. The principle is analyzed by theory and evaluated by simulation. A proof-of-concept experiment is also *** agreements between theoretical prediction and experimental results have been found. This approach might be attractive due to the feature of a variable modulation index, which insures simple operation in practice.

关键词： Frequency-doubled triangular shape lightwave generation with a flexible modulation index MZM flexible

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A Wide Wavelength Range of 1 × 8 Optical Power Splitter with an Imbalance of Less Than ±1.0 dB on Silicon-on-Insulator Technology

IEEE Photonics Journal

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IEEE Photonics Journal 2017年第6期9卷 1-5页

作者： Fan, Guofang Li, Yuan Han, Bing Key Lab. of All Optical Network and Advanced Telecommunication Network of Ministry of Education Institute of Lightwave Technology Beijing Jiaotong University Beijing100044 China Shanghai Institute of Measurement and Testing Technology National Center of Measurement and Testing for East China National Center of Testing Technology Shanghai201203 China Shenyang Ruigang Science and Technology Shenyang110011 China

A 1 × 8 optical splitter on silicon-on-insulator technology is demonstrated with less than ±1.0 dB imbalance for a wavelength range of 300 nm, in which, a multimode interference (MMI) structure is introduced into an optical power splitter. A comparison is provided for 1 × 2 MMI splitters with and without tapers, a 1 × 2 MMI splitter with tapers is designed, fabricated and measured, which show a wider wavelength range of 300 nm with a lower imbalance of less than ±0.25 dB and a propagation loss of 3 dB. © 2009-2012 IEEE.

关键词： Silicon on insulator technology

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High sensitivity side-hole fiber magnetic field sensor,based on surface plasmon resonance

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Chinese Optics Letters 2016年第11期14卷 19-22页

作者：翁思俊裴丽王建帅宁提纲李晶 Key Lab of All Optical Network and Advanced Telecommunication Network of Ministry of Education Institute of Lightwave TechnologyBeijing Jiaotong University

A high sensitivity magnetic fluid（MF） filled side-hole fiber magnetic field sensor based on surface plasmon resonance（SPR） is designed and *** the side-hole fiber,the water-based MF is injected into the two side holes,and both of the holes are coated with gold to realize the measurement of the magnetic field by using the SPR *** refractive index of the MF changes with different external magnetic fields,resulting in the resonant wavelength moving to other ***,when the external magnetic field increases from 30 to 210.9 Oe,the magnetic field sensitivity can reach to 1.063 nm/Oe.

关键词： Fiber optics sensors Magneto-optical materials Surface plasmons

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Multilayer-core fiber with a large mode area and a low bending loss

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Chinese Optics Letters 2016年第12期14卷 36-40页

作者：姜有超任国斌廉玉东刘昱刘怀清李海粟任文华简伟简水生 Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Institute of Lightwave Technology Beijing Jiaotong University

We present a single-mode multilayer-core fiber with a large mode area（LMA） and a low bending loss in this Letter. A low equivalent core-cladding refractive index difference is achieved by exploiting the multilayer structure. The multilayer structure has a better bending performance than a traditional step-index core and this structure also contributes to realizing different curved refractive index profiles that have a better bending performance. An index trench is also introduced to dramatically reduce the bending loss. The experimental results show that, at a wavelength of 1550 nm, the mode area of the fabricated fiber is about 215.5 μm^2 and the bending loss is 0.58 dB/turn at a 10 mm bending radius. The LMA and excellent bending performance can be obtained simultaneously with the proposed fiber.

关键词： bending trench multilayer cladding radius refractive curved hundreds straight photonic

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Formation of a narrow nonlinear layer in thermally poled optical fibers

Formation of a narrow nonlinear layer in thermally poled opt...

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Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, BGPP 2016

作者： Huang, Lin An, Honglin Fleming, Simon Ren, Guobin Institute of Photonics and Optical Science School of Physics The University of Sydney NSW2006 Australia Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing100044 China

A mechanism is proposed for the formation of a narrow nonlinear layer deep under the anode in thermally poled fibers, based on a two-rate H+ migration mechanism. Simulations agree second harmonic microscopy measuremen... 详细信息

ISBN: (纸本)9781943580170

关键词： Nonlinear optics

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Low-sidelobe non-uniform transverse slotted antenna array fed by substrate integrated waveguide

Low-sidelobe non-uniform transverse slotted antenna array fe...

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International Conference on Microwave and Millimeter Wave Technology Proceedings

作者： Jingxue Wang Yunjie Geng Junhong Wang Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing Jiaotong University Beijing China

A low-sidelobe substrate integrated waveguide (SIW) leaky wave antenna (LWA) array with non-uniform transverse slots is proposed. By tuning the length of the radiating slot etched on the SIW, the sidelobe level of the design can be effectively reduced. A four-way SIW power divider with equal outputs of same phase and amplitude is designed to feed a four by one array. The proposed LWA array shows a low sidelobe level up to -28.4 dB and can scan within an angular range of 36° with frequency varying from 2.2 GHz to 3.0 GHz.

关键词： Antenna arrays Slot antennas Leaky wave antennas Gain Substrates Power dividers Optical waveguides

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Design of overmoded-waveguide directional coupler and correction of coupling coefficient calculation

Design of overmoded-waveguide directional coupler and correc...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Yutao An Junhong Wang Zheng Li Yujian Li Xingying Huo Xiaoyu Han Institute of Light wave Technology Beijing Jiaotong University Beijing China Key Lab of All Optical Network & Advanced Telecommunication Network of MOE Beijing Jiaotong University Beijing China

ISBN: (纸本)9781509047444

In order to satisfy the requirement of high-power microwave system, a novel overmoded-waveguide directional coupler centred at 2.4 GHz, with low coupling of 40-50 dB, and with directivity greater than 20dB, is designed. A resonant cavity as the transition waveguide between main waveguide and sub-waveguide is introduced. This paper also proposes a correction of coupling coefficient calculation. Ultimately, after optimizing the parameters, a structure with good performance is obtained.

关键词： Decision support systems

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Modulation format recognition of multiple types in optical fiber communication system

Modulation format recognition of multiple types in optical f...

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International Symposium on Optoelectronic Technology and Application 2016(OTA 2016)——Conf.15 Optical Communication and Optical network

作者： Zhang Yanqiu Zhang Jianyong Institute of Lightwave Technology Beijing Jiaotong University Key Lab of All Optical Network & Advanced Telecommunication Network of Ministry of Education of the People’s Republic of China Beijing Jiaotong University

The modulation format recognition(MFR) technology of communication signals has been an important subject in the field of communication. However, the research progress of MFR in optical fiber communica

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