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	1. High sensitivity diaphragm-based extrinsic Fabry-Pérot interferometric optical fiber underwater ultrasonic sensor
	WANG Wenhua ,Qingxu YU,Xinsheng JIANG
	Electrics, Communication and Autocontrol Technology 04 August 2012
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	Abstract:In this paper, a novel structure of the diaphragm-based extrinsic Fabry-Pérot interferometric (DEFPI) optical fiber ultrasonic sensor with a through vent hole of the fused silica ferrule was present. In this sensor system, the amplified spontaneous emission (ASE) optical source and the Fabry-Pérot filter are used to adjust the wavelength of the operation point of the sensor. We performed the ultrasonic distance detection experiment from 1 cm to 31 cm and the sensor sensitivity experiment, and the pressure sensitivity of the sensor is 9.68 nm/kPa (66.69 nm/psi). The sensitivity of the fusion silica structure DEFPI optical fiber is much higher than that of the HCPCF-ILFP (hollow-core photonic crystal fiber in-line fiber-optic Fabry-Pérot) and the fiber Bragg grating (FBG).
	TO cite this article:WANG Wenhua ,Qingxu YU,Xinsheng JIANG. High sensitivity diaphragm-based extrinsic Fabry-Pérot interferometric optical fiber underwater ultrasonic sensor[OL].[ 4 August 2012] http://en.paper.edu.cn/en_releasepaper/content/4485857


	2. Generation of highly efficient, nanosecond Ince-Gaussian beams in Cr,Nd:YAG microchip lasers
	DONG Jun,Ma Jian,REN Yingying,Xu Guozhang,Kaminskii A. Alexander
	Electrics, Communication and Autocontrol Technology 23 July 2012
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	Abstract:Direct generation of higher-order Ince-Gaussian (IG) beams from laser-diode end-pumped Cr,Nd:YAG self-Q-switched microchip laser was achieved with high efficiency and high repetition rate. Average output power over 2 W was obtained with absorbed pump power of 8.2 W, corresponding optical-to-optical efficiency of 25% was achieved. Various IG modes with nanosecond pulse width and peak power of over 2 kW level were obtained in laser-diode pumped Cr,Nd:YAG microchip lasers under different pump power levels by applying titled, large area pump beam. The effect of the inversion population distribution induced by the titled pump beam and nonlinear absorption of Cr4+-ions on the oscillation of higher-order IG modes in Cr,Nd:YAG microchip lasers were addressed. The effect of higher-order IG mode oscillation on the laser performance of Cr,Nd:YAG microchip lasers was also discussed.
	TO cite this article:DONG Jun,Ma Jian,REN Yingying, et al. Generation of highly efficient, nanosecond Ince-Gaussian beams in Cr,Nd:YAG microchip lasers[OL].[23 July 2012] http://en.paper.edu.cn/en_releasepaper/content/4485493

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	3. Diametric load sensor using a fiber Bragg grating and its differential group delay analysis
	Wang Yiping,Huang Xiaoqin,Sun Yongxi
	Electrics, Communication and Autocontrol Technology 20 March 2012
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	Abstract:Different from the basic sensing theory of the fiber Bragg grating (FBG) sensors based on spectral analysis, a new method exploiting the polarization properties of FBG for diametric load sensing is proposed. In this paper, the evolution of the differential group delay (DGD) response of FBG with respect to the diametric load is completely studied. The centroid information of the DGD evolution of FBG is subsequently proposed for diametric load sensing. Experiments were carried out to verify the reasonability and feasibility of the sensing method. Good agreements between experimental results and numerical simulations had been obtained.
	TO cite this article:Wang Yiping,Huang Xiaoqin,Sun Yongxi. Diametric load sensor using a fiber Bragg grating and its differential group delay analysis[OL].[20 March 2012] http://en.paper.edu.cn/en_releasepaper/content/4472357


	4. Oscillatory motion of pulse trapping in multi transmission bands photonic bandgap fibers
	WANG Zhi,LIU Yange
	Electrics, Communication and Autocontrol Technology 31 January 2012
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	Abstract:We numerically investigated the interaction between the intense solitonic pulse and the weak signal pulse which copropagate with anomalous dispersion in different photonic bandgaps of the anti-resonant photonic bandgap fibers. When soliton pulse and signal pulse and has the same group velocities, two color soliton are formed. Whereas when their group velocities are not the same but close, signal pulse oscillates around the center of soliton pulse in time domain and the center wavelength of signal pulse also oscillate around the wavelength which matches its group velocity with soliton pulse. The dynamics of the oscillatory motion is investigated based on a vibration equation. The wavelength dependence of output pulse in the pulse trapping process is demonstrated and this phenomenon may be used to make tunable wavelength converter.
	TO cite this article:WANG Zhi,LIU Yange. Oscillatory motion of pulse trapping in multi transmission bands photonic bandgap fibers[OL].[31 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4464417


	5. How to improve the S/N ratio of the circular polarizer with single-helical metamaterials?
	YANG Zhenyu,ZHAO Ming
	Electrics, Communication and Autocontrol Technology 08 January 2012
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	Abstract:Circular polarizers with multi-helical metamaterials have two orders higher signal-to-noise (S/N) ratios than that of single-helical metamaterials. However, it has been a great challenge to fabricate such multi-helical structures with micron or sub-micron feature sizes. Is it possible for the single-helical metamaterials to obtain equally high S/N ratios as the multi-helical ones To answer this question, we systematically investigated the influences of structural parameters of single-helical metamaterials on the S/N ratios using the finite-different time-domain (FDTD) method. It was found that the single-helical metamaterials can also reach about 30dB S/N ratios, which are equal to the multi-helical ones. Furthermore, we explained the phenomenon by the antenna theory and optimized the performances of the single-helical circular polarizers.
	TO cite this article:YANG Zhenyu,ZHAO Ming. How to improve the S/N ratio of the circular polarizer with single-helical metamaterials?[OL].[ 8 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4460599


	6. The analysis for thermal resistance of multi-emitter laser diodes
	Li Jingwan,Feng Shiwei,Zhang Guangchen,Xiong Cong,Qiao Yanbin,Guo Chunsheng
	Electrics, Communication and Autocontrol Technology 16 December 2011
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	Abstract:The transient temperature characteristics of high power laser diode (LD) with multiple emitters were presented and discussed in this paper. The transient temperature response curves were measured by electrical temperature sensitive parameter method. Structure function method was performed to evaluate the thermal resistance constitution for multiple emitters LD. The thermal resistance network model was adopted to characterize the thermal behavior of LDs with one, two and four emitters respectively. The experiment result shows that chip level thermal resistance of multiple emitters LD decreases proportionally to the number of emitters, while the package level thermal resistance remains unchangeable. The study provides an important rule in the thermal design of multiple emitters LD.
	TO cite this article:Li Jingwan,Feng Shiwei,Zhang Guangchen, et al. The analysis for thermal resistance of multi-emitter laser diodes[OL].[16 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4456091


	7. Temperature-Insensitive Pressure Sensor Based on All-Fused-Silica Extrinsic Fabry-Pérot Optical Fiber Interferometer
	Wenhua WANG,Qingxu YU,Fang LI,Xinlei ZHOU,Xinsheng JIANG
	Electrics, Communication and Autocontrol Technology 13 December 2011
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	Abstract:A novel high sensitivity pressure sensor based on all-fused-silica Extrinsic Fabry-Pérot optical fiber interferometer, which exhibits extreme low temperature dependence, has been developed. The sensor can excellently operate with a sensitivity of 5.18nm/KPa (0.75nm/psi), a resolution of 38Pa (0.005psi). Due to epoxy-free bonding and reserving a vent hole between the fiber and the ferrule in the process of laser heating fusion bonding, the temperature dependence is significantly reduced to the 0.011nm/℃, and pressure measurement error is 0.021KPa/℃ (0.003psi/℃). The operating point doesn't shift with backpressure change due to the vent hole. The sensor may be suitable for liquid measurement, environmental monitoring and other industrial applications in harsh environment.
	TO cite this article:Wenhua WANG,Qingxu YU,Fang LI, et al. Temperature-Insensitive Pressure Sensor Based on All-Fused-Silica Extrinsic Fabry-Pérot Optical Fiber Interferometer[OL].[13 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4455359


	8. Response properties of photovoltaic detectors irradiated under femtosecond pulses
	Dong Zhiwei,Su Shuheng,Lv Kun,Xia Yuanqin,Chen Deying
	Electrics, Communication and Autocontrol Technology 15 November 2011
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	Abstract:Output properties of Si based photovoltaic detectors were researched applying femtosecond pulses with different repetition rates. The output properties of these detectors with different load conditions were also researched. The linear response domain of PIN detector with external reverse bias voltage was found quite large for different femtosecond pulses repetition rates. The sensitivity of PN detector was found much higher when applying external reverse bias voltage with femtosecond repetition rate 76 MHz. The saturation effect of PN detector was attributed to the slow response speed of the photovoltaic detector.
	TO cite this article:Dong Zhiwei,Su Shuheng,Lv Kun, et al. Response properties of photovoltaic detectors irradiated under femtosecond pulses[OL].[15 November 2011] http://en.paper.edu.cn/en_releasepaper/content/4450059


	9. Generation of Repetition-Rate-Quadrupled Optical Pulse Trains Using A PolM or A Pair of PolMs
	Zou Xihua,Pan Wei,Luo Bin,Yan Lianshan,Deng Guo
	Electrics, Communication and Autocontrol Technology 03 November 2011
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	Abstract:Two approaches are proposed to generating repetition-rate quadrupled optical pulse trains using a polarization modulator (PolM) or a pair of PolMs. In the first approach, a PolM is used in conjunction with a dispersive element (i.e., a chirped fiber Bragg grating). In the second approach, a pair of PolMs which are connected in parallel are employed. The fundamental principle in achieving repetition-rate quadrupling is the periodic suppression of three consecutive optical spectral lines of a phase-modulated light wave. A proof-of-concept experiment is performed in which a return-to-zero (RZ) pulse train having a repetition rate of 13.6 GHz is generated when a sinusoidal signal at 3.4 GHz is applied.
	TO cite this article:Zou Xihua,Pan Wei,Luo Bin, et al. Generation of Repetition-Rate-Quadrupled Optical Pulse Trains Using A PolM or A Pair of PolMs[OL].[ 3 November 2011] http://en.paper.edu.cn/en_releasepaper/content/4448410


	10. In vivo experiments of laser induced interstitial thermotherapy on liver tissue with FBG temperature distribution sensor
	CHEN Na,CHEN Shaofeng,ZHU Hongfei,LIU Shupeng,CHEN Zhenyi
	Electrics, Communication and Autocontrol Technology 13 October 2011
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	Abstract:In this paper, we measured the temperature distribution of liver tissue both in vivo and in vitro during Laser Induced Interstitial Thermotherapy (LITT). Fiber Bragg grating (FBG) was embedded in the laser irradiated bio tissues used as fully distributed temperature sensor. The temperature profile was reconstructed from its reflection spectra. The temperature measurement system we built can measure the FBG axial temperature distribution. We studied the dependence of the temperature distribution and laser output power experimentally and compared the results of in vivo and in vitro under similar laser irradiating conditions. Experimental results show that the slope and trend of the measured temperature curves in vivo and in vitro are almost identical. Due to influence of body temperature, the in vivo measured temperature is higher than the in vitro one with an almost constant temperature difference value.
	TO cite this article:CHEN Na,CHEN Shaofeng,ZHU Hongfei, et al. In vivo experiments of laser induced interstitial thermotherapy on liver tissue with FBG temperature distribution sensor[OL].[13 October 2011] http://en.paper.edu.cn/en_releasepaper/content/4445508

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