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

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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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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Switchable multi-wavelength fiber laser based on modal interference

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Chinese Physics B 2015年第8期24卷 317-322页

作者：马林孙将齐艳辉康泽新简水生 Key Laboratory of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University

A comb fiber filter based on modal interference is proposed and demonstrated in this paper. Here two cascaded uptapers are used to excite the cladding mode, and a core-offset jointing point is used to act as an interference *** results show that this kind of structure possesses a comb filter property in a range of the C-band. The measured extinction ratio is better than 12 dB with an insertion loss of about 11 dB. A switchable multi-wavelength erbium-doped fiber laser based on this novel comb filter is demonstrated. By adjusting the polarization controller, the output laser can be switched among single-, dual-, and three-wavelengths with a side mode suppression ratio of better than 45 dB.

关键词： fiber laser up-taper core-offset modal interferometer

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all-fiber modal interferometer based on an up-taper-core-offset structure for curvature sensing

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Chinese Physics B 2015年第4期24卷 207-210页

作者：马林齐艳辉孙将康泽新简水生 Key Laboratory of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University

A high-sensitivity curvature sensor based on an up-taper-core-offset structure is proposed and demonstrated in this paper. Here two specially designed cascaded up-tapers with maximum diameters of 247 μm and 251 μm, respectively, are used as a cladding mode exciting component. The excited cladding modes will propagate in the cladding and re-couplers with the core mode at the core-offset jointing point. When the curvature is changed, the dip wavelength of the sensor will shift to a blue wavelength and an average curvature sensitivity of more than -12.5 nm/m^-1 is achieved within the measured curvature intervals.

关键词： curvature sensor up-taper core-offset modal interferometer

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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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Noise-like pulse generation from a thulium-doped fiber laser using nonlinear polarization rotation with different net anomalous dispersion

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Photonics Research 2016年第6期4卷 318-321页

作者： Shuo Liu Fengping Yan Yang Li Luna Zhang Zhuoya Bai Hong Zhou Yafei Hou Key Laboratory of All Optical Network & Advanced Telecommunication of EMC Institute of Lightwave TechnologyBeijing Jiaotong University Institute of Applied Physics and Computational Mathematics Department of Electronics Information and Communication Engineering Osaka Institute of Technology Graduate School of Information Science Nara Institute of Science and Technology

A mode-locked thulium-doped fiber laser(TDFL) based on nonlinear polarization rotation(NPR) with different net anomalous dispersion is demonstrated. When the cavity dispersion is-1.425 ps^2, the noise-like(NL) pulse with coherence spike width of 406 fs and pulse energy of 12.342 nJ is generated at a center wavelength of 2003.2 nm with 3 dB spectral bandwidth of 23.20 nm. In the experimental period of 400 min, the 3 dB spectral bandwidth variation, the output power fluctuation, and the central wavelength shift are less than 0.06 nm, 0.04 d B, and0.4 nm, respectively, indicating that the NPR-based TDFL operating in the NL regime holds good long-term stability.

关键词： NPR net Noise-like pulse generation from a thulium-doped fiber laser using nonlinear polarization rotation with different net anomalous dispersion mode

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The study of power allocation schemes for MIMO visible light communication with lattice layout

The study of power allocation schemes for MIMO visible light...

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

作者： Yu Wan-wan Zhang Jian-yong Institute of Light-wave 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 visible light communication(VLC) use simple intensity modulation and direct detection in general, ignoring the frequency and phase of signal, and lead to the high channel correlation on optical wi

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