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Design and optimization of an ultra-broadband single-polarization single-mode photonic crystal fiber with large mode area

Design and optimization of an ultra-broadband single-polariz...

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中国光学学会纤维光学与集成光学专业委员会全国第15次光纤通信暨第16届集成光学学术会议

作者： Shuqin Lou Liwen Wang Weiguo Chen Honglei Li Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

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Novel modal interferometer based on ring-core photonic crystal fiber

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Chinese Optics Letters 2010年第10期8卷 986-988页

作者：陈卫国娄淑琴王立文简水生 Institute of Lightwave Technology Key Lab of All Optical Network and Advanced Telecommunication Network Ministry of Education Beijing Jiaotong University

An original design of ring-core photonic crystal fiber （RPCF） is proposed. By splicing a section of the homemade RPCF between two segments of single mode fibers （SMFs）, a simple modal interferometer is presented and experimentally demonstrated. Owing to the effects of the collapsed region, the ring modes in RPCF can be effectively activated. To our knowledge, it is the first time to demonstrate the modal interferometer based on the interference between the ring modes, which is different from the previously reported interferometers based on the interference between core modes or cladding modes. The temperature and strain characteristics of the interferometers with different lengths of RPCF are investigated.

关键词： Crystal whiskers Interferometers Photonic crystals Single mode fibers

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A novel method of rapidly modeling optical properties of actual photonic crystal fibres

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Chinese Physics B 2010年第8期19卷 1-7页

作者：王立文娄淑琴陈卫国李宏雷 Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Institute of Lightwave Technology Beijing Jiaotong University

The flexible structure of photonic crystal fibre not only offers novel optical properties but also brings some difficulties in keeping the fibre structure in the fabrication process which inevitably cause the optical properties of the resulting fibre to deviate from the designed properties. Therefore, a method of evaluating the optical properties of the actual fibre is necessary for the purpose of application. Up to now, the methods employed to measure the properties of the actual photonic crystal fibre often require long fibre samples or complex expensive equipments. To our knowledge, there are few studies of modeling an actual photonic crystal fibre and evaluating its properties rapidly. In this paper, a novel method, based on the combination model of digital image processing and the finite element method, is proposed to rapidly model the optical properties of the actual photonic crystal fibre. Two kinds of photonic crystal fibres made by Crystal Fiber A/S are modeled. It is confirmed from numerical results that the proposed method is simple, rapid and accurate for evaluating the optical properties of the actual photonic crystal fibre without requiring complex equipment.

关键词： photonic crystal fibre digital image processing finite element method modeling optical properties

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Optical ultra-wideband pulse generation and distribution using a dual-electrode Mach-Zehnder modulator

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Chinese Optics Letters 2010年第2期8卷 138-141页

作者：李晶宁提纲裴丽祁春慧 Institute of Lightwave Technology Beijing Jiaotong University Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University

A novel approach to generate and distribute ultra-wideband （UWB） pulses in optical domain is investigated. In this proposed scheme, a dual-electrode Mach-Zehnder modulator （DE-MZM） is biased at its quadrature point so as to realize the linear response. Then the intensity of output optical field can be assumed to the subtraction of two input Gaussian pulses. If the input Gaussian pulses are with the same sharp parameters but different time delays, a quasi-monocycle-waveform UWB signal can be generated. If the input Gaussian pulses are with different amplitudes and full-width at half-maximum （FWHM）, a quasi-doublet-waveform UWB signal can be generated. A transmission of the UWB signals through a 25-km single mode fiber is carried out successfully. The results in both temporal and frequency domains are also presented.

关键词： Light modulators Modulation Pulse generators Single mode fibers

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Low-Profile Penta-Band Monopole Antenna for Mobile Communication Applications

Low-Profile Penta-Band Monopole Antenna for Mobile Communica...

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IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

作者： Yu Han Junhong Wang Meie Chen Zhan Zhang Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781424482658

An internal monopole antenna with compact size is proposed in this paper, which can be applied to mobile communications, and its frequency band covers GSM850, GSM900, DCS, PCS, UMTS bands simultaneously. It is comprised of a driven monopole and a coupled loop strip. By inserting a folded slit in the driven rectangular patch, two wide bands are achieved. The antenna has a small area of 48 X 12 mm~(2), and is easy to be integrated into the mobile device. Details of the antenna design and experimental results are presented.

关键词： monopole antenna multi-band antenna mobile communication

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Radiation and Scattering Properties of the Dual-Port Fed Differential Microstrip Antennas

Radiation and Scattering Properties of the Dual-Port Fed Dif...

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IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

作者： Weiwei Xu Junhong Wang Zhan Zhang Meie Chen Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781424482658

For traditional differential fed microstrip patch antenna, the phase difference between the two excitation ports is set to 180 deg. In this paper, the radiation and scattering characteristics of differential microstrip antenna fed by phase difference out of 180 deg are studied. The variations of the co-polarization and cross-polarization radiations of the antenna are analyzed, and the bi-static and mono-static scattering properties of the antenna are also studied. The radiation and scattering characteristics of the two port fed differential antenna are compared with those of the single port fed antennas. Research results show that it is possible to find a phase difference of excitation of dual-port fed antenna that gives low cross-polarization radiation and low scattering.

关键词： differential fed antenna radiation characteristics scattering properties microstrip patch antennas

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Switchable dual-wavelength erbium-doped fiber laser based on the photonic crystal fiber loop mirror and chirped fiber Bragg grating

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Optoelectronics Letters 2010年第2期6卷 94-97页

作者：陈卫国娄淑琴王立文李宏雷郭铁英简水生 Key Lab of All Optical Network and Advanced Telecommunication Network of Education Ministry of China Institute of Lightwave TechnologyBeijing Jiaotong University

The switchable dual-wavelength erbium-doped fiber laser(EDFL) with a two-mode photonic crystal fiber(PCF) loop mirror and a chirped fiber Bragg grating(CFBG) at room temperature is proposed and experimentally *** two-mode PCF loop mirror is formed by inserting a piece of two-mode PCF into a Sagnac loop mirror,with the air-holes of the PCF intentionally collapsing at the *** adjusting the state of the polarization controller(PC) appropriately,the laser can be switched between the stable single-and dual-wavelength operations by means of the polarization hole burning(PHB) and spectral hole burning(SHB) effects.

关键词：掺铒光纤激光器啁啾光纤光栅光子晶体光纤双波长光纤环镜切换 Sagnac环镜光纤布拉格光栅

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An asymmetric dual-core single-polarization single-mode photonic crystal fiber coupler

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Optoelectronics Letters 2010年第4期6卷 272-274页

作者：李宏雷娄淑琴陈卫国王立文简水生 Key Lab of All Optical Network and Advanced Telecommunication Network of Education Ministry of China Institute of Lightwave TechnologyBeijing Jiaotong University

A vectorial finite element method(VFEM) is adopted to investigate the novel single-polarization single-mode(SPSM) photonic crystal fiber(PCF) coupler which has asymmetric dual-core and two lines of enlarged air *** is demonstrated that the SPSM region of the designed fiber can be more than 250 nm wide with a set of optimized air-hole parameters and the width of the SPSM region could change slightly by fine adjustment of the inner large air *** coupling length between the odd and even x-polarization modes is also investigated through fine-tuning the large and small air-hole diameters.

关键词：光子晶体光纤光纤耦合器单偏振非对称单模双核矢量有限元法气孔直径

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Impact of the second order dispersion on compensation of SPM in an adaptive pulse pre-shaping quasi-CPA system

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Optoelectronics Letters 2010年第1期6卷 41-44页

作者：耿蕊简水生 Key Lab. of All Optical Network and Advanced Telecommunication Network of Education Ministry of China and Instituteof Lightwave TechnologyBeijing Jiaotong University

A model of quasi-CPA (chirped pulse amplification) system, in which the input is the transform-limited Gaussian pulses, is set up numerically to investigate the impact of the second order dispersion on the adaptive compensation of self-phase modulation (SPM) effect. The adaptive phase pre-shaping controlled by differential evolution algorithm is introduced to the input pulse before amplification and recompression. With maximizing the peak power of the output pulse, the simulation results show that the normal dispersion is really helpful to eliminate the side lobes of the output pulse and increase the pulse peak power.

关键词：自适应补偿注册会计师脉冲整形二阶色散 SPM 啁啾脉冲放大差分进化算法峰值功率

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Fabrication of Optical Fiber Bragg Grating Assisted Mismatched Coupler

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Chinese Physics Letters 2010年第1期27卷 155-158页

作者：刘志明李坚郑晶晶范林勇江微微简水生 Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 Signal and Communicaiton Research Institute China Academy of Railway Sciences Beijing 100081

We report the fabrication of an optical fiber Bragg grating assisted mismatched coupler based on the fused biconical tapered technology. The investigation of the spectrum properties shows that the coupler has a good filtering property. The drop filtering efficiency as much as 94.2% at 1553.5nm is achieved. Furthermore, using the fabricated coupler, a wavelength de-multiplexing transmission experiment is carried out in a 10Gbps system with NRZ optical signals. Experimental results show that the coupler basically realizes the function of wavelength de-multiplexing.

关键词： Chinese climate network complex systems small world community

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