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	1. Realizing Left-handed Medium in Optical Frequency Band Using Quantum Coherence
	KANG Chong,FAN Liming,DAI Zhiguo
	Electrics, Communication and Autocontrol Technology 02 January 2015
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	Abstract:In the nature, electric permittivity and magnetic permeability are important parameters for describing the basic electromagnetic properties of a material. These two parameters determine the propagation characteristics of electromagnetic waves. Left-handed medium is a material which has simultaneously negative electric permittivity and magnetic permeability. The left hand medium in microwave frequency band has been realized. But with the increasing frequency of electromagnetic waves, it is hard for us to realize left hand material in optical frequency band. Because a per million of electric dipole acts on transition .In this paper, we try to use the three-level atom structure of Λ type to realize the left-handed medium, and analyze the effect on atom density, light intensity to left-handed medium.
	TO cite this article:KANG Chong,FAN Liming,DAI Zhiguo. Realizing Left-handed Medium in Optical Frequency Band Using Quantum Coherence[OL].[ 2 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4626459


	2. Development of a GHz Microwave Signal Source for Electro-Optical Switch
	Song Qiang,Huang Xiaoliang,Li Yanting,Zheng Chuantao,Wang Yiding
	Electrics, Communication and Autocontrol Technology 13 June 2014
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	Abstract:In this paper, a portable GHz signal source is designed and developed based on advanced RSIC machine (ARM7) processor and lock-in amplifying technique, which includes a signal generator and a signal amplifier. Simulation on microstrip line electrode is performed using high frequency structure simulator (HFSS) software, and both PCB thickness and electrode width are optimized to get an characteristic impedance of 50 Ω. After the integration of the overall system, measurements are carried out to derive the performances of the signal source. Experimental results indicate that, as the frequency increases from 0.2 to 1.5 GHz, the peak-to-peak amplitude range of the unamplified signal is 16.3~333 mV, that of the amplified signal is 0.152~4.02 V, and the gain of the developed amplifier is 17.7~22.8 dB; the output power decreases from -17.41 to -4.788 dBm, and the cutoff frequency is estimated to be about 4.6 GHz under the noise level of -55 dBm. The signal source can be utilized to supply GHz driving signals for electro-optic switches instead of the commercially avilable expensive ones due to its compact size and acceptable performances.
	TO cite this article:Song Qiang,Huang Xiaoliang,Li Yanting, et al. Development of a GHz Microwave Signal Source for Electro-Optical Switch[OL].[13 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4600375

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	3. Energy scaling of tunable Terahertz parametric oscillator with surface emitted configuration
	WANG Yuye,LI Zhongxiao,LI Jiaqi,YAN Chao,XU Degang,YAO Jianquan
	Electrics, Communication and Autocontrol Technology 29 May 2014
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	Abstract:A high-energy THz-wave output has been experimentally demonstrated with terahertz-wave parametric oscillator based on surface-emitted configuration. Through optimizing the cavity length and pump beam size, the maximum THz-wave output energy of 854nJ/pulse was obtained at 1.62THz with the conversion efficiency of 5.7×10-5, corresponding to the photon conversion efficiency of 0.99%. The THz beam profile is measured with THz imager, and it has a Gaussian profile. The measured beam diameter sizes were 423μm and 258μm in the horizontal and vertical directions, respectively. The wide tunable range from 0.75 to 2.81 THz was realized.
	TO cite this article:WANG Yuye,LI Zhongxiao,LI Jiaqi, et al. Energy scaling of tunable Terahertz parametric oscillator with surface emitted configuration[OL].[29 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4598820


	4. Tiny fiber-optic high-temperature sensors based on the endlessly single mode photonic crystal fiber
	DING Wenhui,JIANG Yi
	Electrics, Communication and Autocontrol Technology 03 March 2014
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	Abstract:A miniature fiber-optic temperature sensor which can measure high temperature in a small volume is proposed and experimentally demonstrated. The sensor head is fabricated by splicing a small segment of photonic crystal fiber (PCF) to the single mode fiber (SMF), forming a fiber Fabry-Perot interferometer (FFPI). A high-speed signal processing method is adopted to measure the temperature by detecting the intensity of the reflected light. A high temperature of up to 500 C can be measured by using the propose technique.
	TO cite this article:DING Wenhui,JIANG Yi. Tiny fiber-optic high-temperature sensors based on the endlessly single mode photonic crystal fiber[OL].[ 3 March 2014] http://en.paper.edu.cn/en_releasepaper/content/4587619


	5. Directional emission of micro-cavity lasers with improved output power
	Shi Jianwei,Yan Changling,Li Peng,Zhu Dongda
	Electrics, Communication and Autocontrol Technology 14 February 2014
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	Abstract:Directional emission of light is guided by employing the lima?on-shaped cavity laser structure. In order to overcome the low output power character of micro-cavity lasers, a large size device structure is used in this paper. The micro-cavity lasers were demonstrated by using quantum cascade laser material. The micro-cavity laser with large size of 120um produced a light output peak power of 12mW with a directional emission at far-field divergence angle of about 31 for the parallel direction and 68 for the perpendicular direction at full width of half maximum. The micro-cavity laser array was also fabricated, and a light output peak power of about 20mW was obtained.
	TO cite this article:Shi Jianwei,Yan Changling,Li Peng, et al. Directional emission of micro-cavity lasers with improved output power[OL].[14 February 2014] http://en.paper.edu.cn/en_releasepaper/content/4585491


	6. A Photonic-Assisted Triangular-Shaped Pulses Generator Based on Optical Carrier Brillouin Processing
	LIU Xinkai,PAN Wei,ZOU Xihua,YAN Lianshan,LUO Bin
	Electrics, Communication and Autocontrol Technology 08 February 2014
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	Abstract:A photonic approach for generation of triangular-shaped pulses based on optical carrier Brillouin processing is proposed and experimentally demonstrated. In the proposed approach, A Mach-Zehnder modulator (MZM) biased at the minimum-transmission-point (MITP) is used to generate an optical modulated signal with only the odd-order sidebands. And then the amplification gain provided by stimulated Brillouin scatter (SBS) is adopted to recover the suppressed carrier. Meanwhile, the negative-order sidebands of the optical modulated signal are removed by an optical bandpass filter (OBPF). By appropriately setting the modulation index, the amplitude of the 1st-order harmonic can equal to 9 times of that of the 3rd-order harmonic. In this way, triangular-shaped pulses can be obtained. In the experiment, a triangular-shaped pulse with a tunable repetition rate of 8 GHz is generated.
	TO cite this article:LIU Xinkai,PAN Wei,ZOU Xihua, et al. A Photonic-Assisted Triangular-Shaped Pulses Generator Based on Optical Carrier Brillouin Processing[OL].[ 8 February 2014] http://en.paper.edu.cn/en_releasepaper/content/4584118


	7. Tunable dual-wavelength ?lter based on cascaded acousto-optic gratings in diam-etched ?ber
	Zhang Yao,Feng Xuan-Qi,Qi Xin-Yuan,Jia Jie,He Qing-Li,Bai Jin-Tao
	Electrics, Communication and Autocontrol Technology 07 January 2014
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	Abstract: A new type of tunable dual-wavelength ?lter based on cascaded acousto-optic gratings (AOGs) in diam-etched ?ber was studied both theoretically and numerically. The side lobe suppression effect of diam-etched AOGs on the transmission spectra is studied. The results show that the dual-wavelength ?lter works symmetrically and efficiently with tunable frequency spacing by adjusting the ?ber length, the frequency of the acoustic signal and the number of segments of the ?bers, respectively. Our studies provide a simple way to realize the dynamic manipulation of dual-wavelength ?lter while keeping the side lobes in the ?lter spectrum is suppressed efficiently.
	TO cite this article:Zhang Yao,Feng Xuan-Qi,Qi Xin-Yuan, et al. Tunable dual-wavelength ?lter based on cascaded acousto-optic gratings in diam-etched ?ber[OL].[ 7 January 2014] http://en.paper.edu.cn/en_releasepaper/content/4581165


	8. Switching characteristics of Gauss-apodized fiber Bragg gratings with the point defects
	WANG Xiaoyin,WANG Kuiru,YUAN Jinhui
	Electrics, Communication and Autocontrol Technology 24 December 2013
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	Abstract:We discussed numerical studies of nonlinear transmission characteristic of Bragg fiber gratings(FBG). Nonlinear coupled-mode equations are numerically solved through Runge-Kutta method. The choice of parameters with Gauss-apodized was analyzed in the spectrum shape. It also contributes to obtain a switching of low power consumption. We discussed the number of point defect and width of it to find a most suitable situation to meet the demands. This approach lowers the pump threshold power. It shows potential applications among all-optical switching.
	TO cite this article:WANG Xiaoyin,WANG Kuiru,YUAN Jinhui. Switching characteristics of Gauss-apodized fiber Bragg gratings with the point defects[OL].[24 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4573508


	9. The limitations of optitimizing the FOPA gain by inserting an OBPF
	ZHAO Linlin,YU Chongxiu
	Electrics, Communication and Autocontrol Technology 13 December 2013
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	Abstract:In this paper, the limitations of optimizing the FOPA gain by inserting an OBPF is systemly investigated. A pump depleted model has been developed and the application of OBPF in the dual-pump FOPA is researched by numerial simulation. Results shows that optimizing the FOPA gain by inserting an OBPF is only effective for single pump FOPA and it has many limitations when used in the dual-pump FOPA.
	TO cite this article:ZHAO Linlin,YU Chongxiu. The limitations of optitimizing the FOPA gain by inserting an OBPF[OL].[13 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4573309


	10. Generation of Diffraction-Free Optical Beams Using Wrinkled Membranes
	LI Ran,YI Hui,HU Xiao,CHEN Leng,SHI Guangsha,WANG Weimin,YANG Tian
	Electrics, Communication and Autocontrol Technology 23 October 2013
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	Abstract:We report the first demonstration of wrinkled membranes as a kind of optical focusing devices, which are low cost, light weight and flexible. Our device consists of concentric wrinkle rings on a gold-PDMS bilayer membrane, which converts collimated illuminations to diffraction-free focused beams. Beam diameters of 300-400 μm have been observed in the visible range. By comparing the theoretically calculated and experimentally measured focal spot profiles, we predict a focal spot size as small as around 50 μm if fabrication eccentricity can be eliminated.
	TO cite this article:LI Ran,YI Hui,HU Xiao, et al. Generation of Diffraction-Free Optical Beams Using Wrinkled Membranes[OL].[23 October 2013] http://en.paper.edu.cn/en_releasepaper/content/4559053

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