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Spectral characterization of fiber Bragg grating with etched fiber cladding

Optoelectronics Letters 2012年第5期8卷 328-331页

作者：周倩宁提纲裴丽李超 Key Lab.of All Optical Network and Advanced Telecommunication Network Ministry of EducationBeijing Jiaotong University

A new method is presented to tune Bragg wavelength slightly by using hydrofluoric acid to etch fiber *** spectral characteristics before and after etching and the change properties of Bragg wavelength are *** modes are reduced during the etching ***-order cladding modes are converted into radiation modes,and energy of cladding modes is coupled to the *** the cladding radius decreases,the Bragg wavelength shifts to longer *** results show that this method can tune Bragg wavelength slightly,and the tunable range is 0.002-0.120 nm.

关键词： Etching Fiber Bragg gratings Hydrofluoric acid Spectrum analyzers Wavelength

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Temperature-insensitive fiber Bragg grating strain sensor

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Optoelectronics Letters 2012年第6期8卷 414-417页

作者：周倩宁提纲裴丽李晶李超张婵 Key Lab.of All Optical Network and Advanced Telecommunication Network Ministry of EducationBeijing Jiaotong University

A fiber Bragg grating strain sensor,whose reflection bandwidth is insensitive to temperature,is *** cross-sec-tional area is designed to change *** axial stress,there is a linear relationship between stress and average *** results show that when temperature increases,reflection center wavelength shifts to longer wavelength,and there is a good linear relationship between center wavelength and *** stress increases,reflection center wavelength shifts to longer wavelength,and reflection bandwidth *** are good linear relationships between reflection center wavelength and stress as well as reflection bandwidth and stress.

关键词： Bandwidth Fiber Bragg gratings Sensors

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Stable and High OSNR Compound Linear-Cavity Single-Longitudinal-Mode Erbium-Doped Silica Fiber Laser Based on an Asymmetric Four-Cavity Structure

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Chinese Physics Letters 2012年第10期29卷 54-57页

作者： FENG Ting YAN Feng-Ping LI Qi PENG Wan-Jing FENG Su-Chun WEN Xiao-Dong LIU Peng TAN Si-Yu Key Lab of All Optical Network and Advanced Telecommunication Network of Ministry of Education Institute of Lightwave TechnologyBeijing Jiaotong UniversityBeijing 100044 Department of Physics Xingtai CollegeXingtai 054001

We propose a stable and high optical signal-to-noise ratio(OSNR)compound linear-cavity single-longitudinal-mode(SLM)erbium-doped silica fiber *** consists of three uniform fiber Bragg gratings(FBGs)and two fiber couplers to form a simple asymmetric four-cavity structure to select the longitudinal *** stable SLM operation at the wavelength of 1544.053 nm with a 3 dB bandwidth of 0.014 nm and an OSNR of~60 dB was verified *** laboratory conditions,a power fluctuation performance of less than 0.05 dB for 5 h and wavelength variation of less than 0.01 nm for about 150 min is ***,the characteristic of laser output power as a function of pump power is *** proposed system provides a simple and cost-effective approach to realize a stable SLM fiber laser.

关键词： OSNR fiber Erbium

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A Conformal Antenna Design Using Transformation Optics Theory

A Conformal Antenna Design Using Transformation Optics Theor...

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International Conference on Microwave Technology & Computational Electromagnetics

作者： Yujia Ruan Zhan Zhang Lei Tang Shouliang Li Junhong Wang Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781467363266

Although the analysis of electromagnetic sources transformation under the theory of transformation optics has been widely discussed in many literatures, there are few discussions about actual antennas in the context of coordinate transformation. In this paper, we deduce the proper feeding formulation which is excited upon antennas according to the transformation method of ideal electromagnetic sources, and validate the analysis through numerical simulation of a specific example. This analysis shows that we can design a conformal antenna which has the same field distribution with the antenna having the desired performance by covering the antenna with transformed media. This method provides a new way in designing conformal antennas.

关键词： Conformal antenna feeding gap surface current transformation optics

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Photo-thermal effect in UV-written fiber Bragg gratings

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Zhongguo Jiguang/Chinese Journal of Lasers 2013年第SUPPL期40卷

作者： Ren, Wenhua Yang, Yuguang Feng, Suchun Tan, Zhongwei Key Lab. of All Optical Network and Advanced Telecommunication Network of Ministry of Education Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

A novel method for measuring the photo-thermal effect of fiber Bragg gratings (FBGs) is presented. The photo-thermal effect of an UV-written FBG is studied by using the novel method. A distributed Bragg reflector (DBR) fiber laser is built up by using a 980-nm semiconductor laser as the pump laser, two UV-written FBGs as reflector and a 10-m-long Er-doped fiber as the gain medium. The reflection optical spectrum of the FBG used is obtained while the DBR fiber laser is working. The experimental result shows that the optical reflection spectrum of the FBG shifts by 0.034 nm towards longer wavelength when the pump power is 100 mW, which is induced by the photo-thermal effect. The novel method is applicable in measuring the photo-thermal effect of FBGs.

关键词： Reflection

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Fabrication of twin-core fiber and its application in all-fiber comb filter

Fabrication of twin-core fiber and its application in all-fi...

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Information Optoelectronics, Nanofabrication and Testing, IONT 2012

作者： Pei, Li Li, Zhuoxuan Liu, Chao Ning, Tigang Li, Chao Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781557529602

Twin core fibers(TCFs) with different cross section and core center-to-center distance were fabricated by our innovative method. The fiber comb filters based on a TCF coupler with an uniform free spectral range and based on a TCF Mach-Zehnder interferometer with flat passband have been discussed. The splicing techniques of the TCF have been studied,and a novel all-fiber connector is proposed for connecting each core of a TCF to a single-core fiber (SCF) core simultaneously. © 2012 OSA.

关键词： Optical fiber communication

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Narrow linewidth, linear cavity, erbium-doped fiber laser with saturable absorber

Narrow linewidth, linear cavity, erbium-doped fiber laser wi...

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2012 International Conference on Computer Science and Information Processing, CSIP 2012

作者： Li, Qi Yan, Fengping Feng, Ting Peng, Wanjing Tan, Siyu Key Lab of All Optical Network and Advanced Telecommunication Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781467314114

This paper describes the design and operation of a narrow linewidth, linear cavity, erbium-doped fiber laser with saturable absorber. The saturable absorber, spliced to a narrowband fiber Bragg grating, acts as a transition fiber grating with narrow bandwidth that automatically tracks the lasing wavelength. Laser output power was 2.5mw at 1544.39nm for a pump power of 55mw, the signal to noise ratio (SNR) was approximately 57dB, and the slope efficiency was approximately 5%. © 2012 IEEE.

关键词： Fiber lasers

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Design and analysis of frequency selective surfaces using pinwheel tiling fractal

Design and analysis of frequency selective surfaces using pi...

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2012 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2012

作者： Guo, X.R. Zhang, Z. Wang, Junhong Chen, Meie Key Lab. of All Optical Network and Advanced Telecommunication Network of MOE Beijing Jiaotong University Beijing China Institute of Lightwave Technology Beijing Jiaotong University Beijing China

ISBN: (纸本)9781467321839

A design of single-layer frequency selective surface (FSS) is presented for multiband characteristics. The novel frequency selective surfaces (FSSs) are composed by a periodic array based on the structure of the fractal pinwheel tilings on the top of a dielectric substrate. FSS resonant performance of the square solid patch is improved by the combined pinwheel tilings. Comparison and analysis are presented based on simulated results of transmission coefficients with FSS structures of fractal iteration. © 2012 IEEE.

关键词： Frequency selective surfaces

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A simple mechanism to suppress the mode competition for stable and tunable dual-wavelength erbium-doped fiber lasers

A simple mechanism to suppress the mode competition for stab...

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2012 International Meeting on Opto-Electronics Engineering and Materials Research, OEMR 2012

作者： Zhang, Chenfang Sun, Jiang Zheng, Siwen Jian, Shuisheng Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9783037854884

A suppressant effect for mode competition of dual-wavelength lasing oscillations induced by polarization hole burning effect in an ordinary erbium-doped fiber is proposed and experimentally demonstrated. The polarization hole burning effect is introduced by an all fiber polarization controller directly fused with a segment of erbium-doped fiber. The mechanism of the all fiber polarization controller to suppress the wavelength competition is described in detail. Results show that the mechanism is helpful to obtain stable dual-wavelength lasing oscillations at room temperature in the erbium-doped fiber laser. By adjusting the comb filter, the wavelength tuning between different dual-wavelength oscillations is realized. The side mode suppression ratio of each lasing wavelength is measured to be more than 55dB. The 3dB bandwidth of each lasing oscillation is 0. 01nm and the 30dB bandwidth is 0. 10nm. The power fluctuation and wavelength shift are measured to be less than 0. 8dB and 0. 05nm over 32 minutes for all the dual-wavelength lasing oscillations obtained in the experiment. © (2012) Trans Tech Publications, Switzerland.

关键词： Bandwidth

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New approach for estimating PMD-induced power degradation in millimeter-wave generation systems

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红外与激光工程 2012年第5期41卷 1277-1281页

作者： Gao Song Pei Li Ning Tigang Li Jing Qi Chunhui Key Lab of All Optical Network&Advanced Telecommunication Network of EMC Institute of Lightwave Technology Beijing Jiaotong UniversityBeijing 100044China

A new approach was put torward for estimating the polarization mode dispersion(PMD)induced power degradation to do a performance analysis of millimeter-wave(mm-wave)generation systems based on optical self-heterodyne *** those established ones,this new approach was proposed from another *** the optical cartier which is distributed over optical fiber as a stochastic *** autocorrelation function of the stochastic process was calculated,and then the power degradation could be estimated with Parseval's *** approach to estimate PMD-induced power degradation in normal signal mode fiber(SMF)was *** results of the approach are well approximates to those established ones,which proves that the theoretical approach is *** last,schematics of the power degradation of a 60 GHz signal due to PMD with three different fiber lengths were given to provide intuitive assistance for readers.

关键词： millimeter-wave generation power degradation polarization mode dispersion autocorrelation function

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