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Highly birefringent octagonal photonic crystal fibers with two zero-dispersion wavelengths

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Chinese Optics Letters 2011年第10期9卷 37-40页

作者：夏长明周桂耀韩颖侯蓝田 State Key Laboratory of Metastable Materials Science and Technology Yanshan University School of Information and Optoelectronic Science and Engineering South China Normal University

A new highly birefringent octagonal photonic crystal fiber （Hi-Bi OPCF） with a rectangular array of four elliptical airholes in the fiber core region is proposed and analyzed using the full-vector finite element method with anisotropic perfect match layer absorbing boundaries. Numerical results show that the phase birefringence of the photonic crystal fiber （PCF） reaches 3.43× 10^-2 at the wavelength of 1 550 nm. Moreover, two zero-dispersion wavelengths are achieved in the visible and near infrared wavelength regions for one polarization state but not in the other.

关键词： Birefringence Bismuth Crystal whiskers Dispersion (waves) fibers Finite element method Nonlinear optics Photonic crystals

Towards all-fiber structure pulsed mid-infrared laser by gas-filled hollow-core fibers

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Chinese Optics Letters 2019年第9期17卷 64-67页

作者： Wei Huang Yulong Cui Zhiyue Zhou Zhixian Li Yubin Chen Zefeng Wang College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China State Key Laboratoiy of Pulsed Power Laser Technology Changsha 410073China Hunan Provincial Key Laboratory of High Energy Laser Technology Changsha 410073China Luoyang Electronic Equipment Test Center of China Key Laboratory of Electro-Optical Countermeasures Test & Evaluation TechnologyLuoyang 471003China

We report here on a diode-pumped pulsed mid-infrared laser source based on gas-filled hollow-core fibers(HCFs)towards an all-fiber structure by the tapering method. The pump laser is coupled into an acetylene-filled HCF through a tapered single-mode fiber. By precisely tuning the wavelength of the diode to match different absorption lines of acetylene near 1.5 μm, mid-infrared emission around 3.1–3.2 μm is generated. With 2 m HCFs and3 mbar acetylene gas, a maximum average power of 130 m W is obtained with a laser slope efficiency of ~24%.This work provides a potential scheme for all-fiber mid-infrared fiber gas lasers.

关键词： all-fiber structure pulsed mid-infrared laser gas-filled hollow-core fibers

Propagation characteristics of orbital angular momentum modes at 810 nm in step-index few-mode fibers

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Chinese Optics Letters 2019年第12期17卷 1-5页

作者： Zhouxiang Wang Yuchen Xie Shuangyin Huang Han Zhou Rui Liu Zhifeng Liu Min Wang Wenrong Qi Qianqian Tian Lingjun Kong Chenghou Tu Yongnan Li Huitian Wang School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics Nankai UniversityTianjin 300071China National Laboratory of Solid State Microstructures School of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

In free-space or in optical fibers,orbital angular momentum(OAM)multiplexing for information transmission has been greatly *** light sources used were well coherent communication bands,and the fibers used were ***,we use an 810 nm femtosecond laser to generate optical vortices carrying OAM and then feed them into two kinds of commercial step-index few-mode fibers to explore the transmission characteristics of OAM *** also propose a method without multiple-input multiple-output digital signal processing to identify the input *** is of great guiding significance for high-dimensional quantum information experiments via the OAMs as a degree of freedom,using the light generated by the spontaneous parametric down-conversion as the source and the commercial fibers for information transmission.

关键词： fibers momentum characteristics

Inscription of Bragg gratings in few-mode optical fibers

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Chinese Optics Letters 2013年第2期11卷 18-20页

作者：郭鹏饶云江李登勇龚元 Gangding Peng 吴宇张伟利吴慧娟 Key Lab of Optical Fiber Sensing and Communications (Education Ministry of China) University of Electronic Science and Technology of China School of Electrical Engineering and Telecommunications University of New South WalesSydneyNSW 2052Australia

Few-mode fiber Bragg grating （FM-FBG） has wide applications in the field of multi-wavelength fiber lasers and fiber-optic sensing. In this letter, FBG is successfully written in a novel type of FM fiber （FMF） based on 248-nm excimer laser and a uniform phase mask. A low-loss coupling between the FMF to a single- mode fiber is realized by a graded-index multi-mode fiber with a length of about a quarter pitch. The sensing properties of the FMF grating are further investigated. The experimental results indicate that the novel FM-FBG has sensitivities of temperature, strain, and bending of 11.2 pm/~C, 1.3 pm/pg, and 636.9 pm/m-1, respectively.

关键词： Excimer lasers Fiber lasers fibers

Improvement on refractive index sensing by exploiting the tapered two-mode fibers

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Chinese Optics Letters 2019年第11期17卷 17-21页

作者： Fang Fang Bing Sun Zuxing Zhang Jing Xu Lin Zhang Advanced Photonic Technology Laboratory College of Electronics and Optical Engineering&College of MicroelectronicsNanjing University of Posts and Telecomm unicationsNanjing 210023China Optical Communications Laboratory Ocean CollegeZhejiang UniversityZhoushan 316021China Aston Institute of Photonic Technologies Aston UniversityBirmingham B47ETUK

The spectral characteristics and sensitivities of a tapered two-mode fiber sandwiched between two single-mode fibers are systematically investigated. Theoretical calculations reveal that a dispersion turning point(DTP)appears when the group effective refractive index(RI) difference between the fundamental mode and the higher-order mode equals zero;as a result, ultrahigh RI sensitivities can be achieved. Furthermore, the location of the DTP is strongly dependent on the tapering condition. Then, we experimentally demonstrate high sensitivities of the RI sensor with the waist diameter of 4 μm by means of immersing it in a flow cell filled with glycerol solution. In further tracking of the resonant wavelength shift around the DTP, it is found that the proposed RI sensor exhibits a sensitivity of 1.81 × 104 nm/RIU and a limit of detection down up to 3.29 × 10-5 RIU in a liquid glycerol solution.

关键词： mode fibers refractive

Ultraflat, broadband, and highly coherent supercontinuum generation in all-solid microstructured optical fibers with all-normal dispersion

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Photonics Research 2018年第6期6卷 601-608页

作者： CHUNLEI HUANG MEISONG LIAO WANJUN BI XIA LI LILI HU LONG ZHANG LONGFEI WANG GUANSHI QIN TIANFENG XUE DANPING CHEN WEIQING GAO Key Laboratory of Materials for High Power Laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun 130012 China School of Electronic Science & Applied Physics Hefei University of Technology Hefei 230009 China

High flatness, wide bandwidth, and high-coherence properties of supercontinuum(SC) generation in fibers are crucial in many applications. It is challenging to achieve SC spectra in a combination of the properties, since special dispersion profiles are required, especially when pump pulses with duration over 100 fs are employed. We propose an all-solid microstructured fiber composed only of hexagonal glass elements. The optimized fiber possesses an ultraflat all-normal dispersion profile, covering a wide wavelength interval of approximately 1.55 μm. An SC spectrum spanning from approximately 1030 to 2030 nm(corresponding to nearly one octave) with flatness<3 dB is numerically generated in the fiber with 200 fs pump pulses at 1.55 μm. The results indicate that the broadband ultraflat SC sources can be all-fiber and miniaturized due to commercially achievable 200-fs fiber lasers. Moreover, the SC pulses feature high coherence and a single pulse in the time domain, which can be compressed to 13.9-fs pulses with high quality even for simple linear chirp compensation. The Fourier-limited pulse duration of the spectrum is 3.19 fs, corresponding to only 0.62 optical cycles.

关键词： Fiber design and fabrication Photonic crystal fibers Nonlinear optics fibers Pulse compression Femtosecond phenomena Supercontinuum generation

Applications of weakly-coupled few-mode fibers[Invited]

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Chinese Optics Letters 2020年第4期18卷 1-11页

作者： Huiyuan Liu He Wen Guifang Li CREOL The College of Optics&PhotonicsUniversity of Central FloridaOrlandoFL 32816USA

Space-division multiplexing(SDM)has attracted significant attention in recent years because larger transmission capacity is enabled by more degrees of freedom(DOFs)in few-mode fibers(FMFs)compared with singlemode fibers(SMFs).To transmit independent information on spatial modes without or with minor digital signal processing(DSP),weakly-coupled FMFs are preferred in various *** cases with different use of spatial DOFs in weakly-coupled FMFs are demonstrated in this work,including single-mode or mode-groupmultiplexed transmission,and spatial DOFs combined with time or frequency DOF to improve the system performance.

关键词： multiplexing nonlinear optics fibers radio frequency photonics fiber optics links and subsystems few-mode fibers