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photonic crystal fiber

Nie He, Zhuoyan Li, Gongshen Zhang, An'an Liu, Ding Zhou, Peng Chen, Chengxiang Liu, Xu Wu
A fiber ring resonator (FRR) constructed using a Panda polarization-maintaining fiber does not effectively solve the problem of temperature-related polarization fluctuation, which considerably limits the detection accuracy of the resonant fiber optic gyro. The polarization-maintaining photonic crystal fiber (PM-PCF) can improve the thermal stability of the FRR. In this study, a structure that can simultaneously detect the polarization fluctuation of two FRRs is designed. We analyzed and verified the polarization phase shift errors of these two types of fibers, which are caused by the thermally induced birefringence changes...
August 1, 2018: Sensors
Tongtong Zhao, Shuqin Lou, Xin Wang, Wan Zhang, Yulei Wang
A novel twin-core photonic crystal fiber-based sensor for simultaneous measurement of curvature, strain and temperature is proposed. The fiber sensor is constructed by splicing the homemade twin-core photonic crystal fiber between two segments of single mode fiber. Affected by the coupling between two cores, the transmission spectrum of the fiber sensor has different wavelength responses to curvature, strain, and temperature. The maximal sensitivities to curvature, strain and temperature are 10.89 nm/m-1 , 1...
July 3, 2018: Sensors
Xian Zhang, Xiao-Song Zhu, Yi-Wei Shi
A novel high performance optical fiber refractive index (RI) sensor based on the hybrid transverse magnetic (TM) mode of Tamm plasmon polariton (TPP) and surface plasmon polariton (SPP) is proposed. The structure of the sensor is a multi-mode optical fiber with a one dimensional photonic crystal (1 DPC)/metal multi-films outer coated on its fiber core. A simulation study of the proposed sensor is carried out with the geometrical optical model to investigate the performance of the designed sensor with respect to the center wavelength, bilayer period and the thickness of silver layer...
July 3, 2018: Sensors
Pibin Bing, Shichao Huang, Jialei Sui, Hua Wang, Zhiyong Wang
The characteristics of the dual-core photonic crystal fiber (PCF) sensor are studied using the finite element method (FEM), and the structure is improved according to the numerical simulation results. The results show that whether or not the four large air holes far away from the geometry center of the PCF are filled with analyte has no influence on the wavelength sensitivity of the sensor which means those holes can be replaced by small air holes. The wavelength sensitivity can be tuned by adjusting the sizes of the other large air holes which are as for liquid holes...
June 27, 2018: Sensors
Yujie Shen, Alexander A Voronin, Aleksei M Zheltikov, Sean P O'Connor, Vladislav V Yakovlev, Alexei V Sokolov, Marlan O Scully
We perform a detailed theoretical and experimental investigation of supercontinuum generation in large-mode-area photonic crystal fibers pumped by a high-energy, high-repetition rate picosecond Nd:YVO4 laser, with the goal of using it as the Stokes beam in coherent anti-Stokes Raman scattering setup. We analyze the influence of fiber structure and length on the supercontinuum power, spectral shape, and group delay dispersion. We identify the experimental conditions for stable supercontinuum generation, with microjoule-level pulse energy and the spectrum extending beyond 1600 nm, which allows excitation of Raman frequencies up to 3000 cm-1 and beyond...
June 22, 2018: Scientific Reports
H Hagai Diamandi, Yosef London, Gil Bashan, Arik Bergman, Avi Zadok
Opto-mechanical oscillators that generate coherent acoustic waves are drawing much interest, in both fundamental research and applications. Narrowband oscillations can be obtained through the introduction of feedback to the acoustic wave. Most previous realizations of this concept, sometimes referred to as "phonon lasers", relied on radiation pressure and moving boundary effects in micro- or nano-structured media. Demonstrations in bulk crystals required cryogenic temperatures. In this work, stimulated emission of highly-coherent acoustic waves is achieved in a commercially-available multi-core fiber, at room temperature...
June 22, 2018: Scientific Reports
Ayan Maity, Sushil Mujumdar, Vivek Polshettiwar
Photonic crystals are essentially a periodic ("crystalline") arrangement of dielectric nanoparticles that respond in unison to incident light. They can be used to harvest light in various applications such as photocatalysis, solar cells, and lasing. In this work, we prepared the photonic crystals of dendritic fibrous nanosilica (DFNS) by their self-assembly. Because of the narrow particle size distribution of the as-synthesized DFNS, they readily formed colored photonic crystals. The photonic band gap was found to be tunable by using DFNS of various sizes and fiber densities...
July 11, 2018: ACS Applied Materials & Interfaces
Wu Liu, Haosen Shi, Jiahua Cui, Chen Xie, Youjian Song, Chingyue Wang, Minglie Hu
The generation of high-power ultrashort pulses from a passively mode-locked fiber laser is reported based on the combination of a single-polarization large-mode-area (LMA) photonic crystal fiber with a nonlinear amplifying loop mirror design. The introduction of a non-reciprocal phase shift in the loop mirror enables self-starting of the mode-locked laser, while the polarizing LMA fiber supports environmentally stable high-power operation. Mode locking in the soliton-like, stretched-pulse, and all-normal-dispersion regime is characterized...
June 15, 2018: Optics Letters
Jesper Lægsgaard
The generation of Cherenkov radiation from soliton compression of 1550 nm pulses in tapered photonic crystal fibers is analyzed numerically, with a view to generating short-wavelength-tunable output pulses in the visible range. It is shown that low-noise femtosecond light sources with spectral power densities approaching those of existing supercontinuum sources are feasible with existing fiber laser and tapering technology.
June 15, 2018: Optics Letters
Md Abdul Khalek, Sujan Chakma, Bikash Kumar Paul, Kawsar Ahmed
In this research work a perfectly circular lattice Photonic Crystal Fiber (PCF) based surface Plasmon resonance (SPR) based sensor has been proposed. The investigation process has been successfully carried out using finite element method (FEM) based commercial available software package COMSOL Multiphysics version 4.2. The whole investigation module covers the wider optical spectrum ranging from 0.48 µm to 1.10 µm. Using the wavelength interrogation method the proposed model exposed maximum sensitivity of 9000 nm/RIU(Refractive Index Unit) and using the amplitude interrogation method it obtained maximum sensitivity of 318 RIU-1 ...
August 2018: Data in Brief
Tigran Baghdasaryan, Thomas Geernart, Adriana Morana, Emmanuel Marin, Sylvain Girard, Mariusz Makara, Paweł Mergo, Hugo Thienpont, Francis Berghmans
Fiber Bragg grating inscription with infrared femtosecond pulsed lasers in photonic crystal fiber is far from being trivial due to the presence of air holes in the cladding region and the non-linear nature of the absorption process inducing the required refractive index changes. We have studied this problem numerically and experimentally for a phase mask-based writing setup equipped with short focal length cylindrical lenses, which are often used for through-coating and high temperature stable grating writing...
May 28, 2018: Optics Express
Youfu Geng, Yiwen Xu, Xiaoling Tan, Lina Wang, Xuejin Li, Yu Du, Xueming Hong
In this paper, a simplified hollow-core photonic crystal fiber surface-enhanced Raman scattering (SERS) probe is presented. Silver nanoprisms are grown with a photoreduction method and account for the SERS, which have better electromagnetic enhancement than spherical silver nanoparticles at 785 nm. Due to the antiresonant reflecting guidance mechanism, the excited laser and SERS signal are effectively guided in such a fully filled hollow-core photonic crystal fiber SERS probe and complicated selective filling with target sample is avoided...
May 28, 2018: Sensors
Pan Zhang, Hangzhou Yang, Kok-Sing Lim, Harith Ahmad, Qiangzhou Rong, Qin Tian, Xiangzi Ding
An in-fiber Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated for relative humidity (RH) and temperature measurements. The MZI is formed by a grapefruit-shaped photonic crystal fiber (G-PCF) cascaded with a short section of multimode fiber that serves as a mode coupler. To enhance sensitivity to humidity, femtosecond laser micromachining was performed to remove a portion of cladding of the G-PCF to expose its core to the ambient medium. The output interference spectrum is fast Fourier transformed to produce a spatial frequency spectrum that describes the intensity composition of the cladding modes in the MZI...
May 20, 2018: Applied Optics
William O F Carvalho, Danilo H Spadoti, Enrique Silvestre, Felipe Beltran-Mejia
A photonic crystal fiber Mach-Zehnder interferometer design was optimized to obtain high performance and ultralow chirp. Two long-period gratings were used to excite the cladding modes, and the rich structure of the cladding was tailored to obtain a slightly chirped free spectral range, as required by the Telecommunication Standardization Sector of the International Telecommunication Union (ITU-T) Norm G.694.1. Finally, a fabrication tolerance analysis was performed. The advantages of the proposed device are an ultralow chirp, high bandwidth, and fabrication robustness tolerance...
May 20, 2018: Applied Optics
JunJun Wu, Shuguang Li, Xinyu Wang, Min Shi, Xinxing Feng, Yundong Liu
We propose a D-shaped photonic crystal fiber (PCF) refractive index sensor with ultrahigh sensitivity and a wide detection range. The gold layer is deposited on the polished surface, avoiding filling or coating inside the air holes of the PCF. The influences of the gold layer thickness and the diameter of the larger air holes are investigated. The sensing characteristics of the proposed sensor are analyzed by the finite element method. The maximum sensitivity can reach 31,000  nm/RIU, and the refractive index detection range is from 1...
May 20, 2018: Applied Optics
Yan Qin, Huajun Yang, Ping Jiang, Fengji Gui, Weinan Caiyang, Biao Cao
In this paper, an asymmetric large-mode-area photonic crystal fiber (LMA-PCF) with low bending loss at a smaller bending radius is designed. The finite-element method with a perfectly matched layer boundary is used to analyze the performance of the PCF. To achieve LMA-PCF with low bending loss, the air holes with double lattice constants and different sizes at the core are designed. Numerical results show that this structure can achieve low bending loss and LMA with a smaller bending radius at the wavelength of 1...
May 10, 2018: Applied Optics
Jianshuai Wang, Li Pei, Sijun Weng, Liangying Wu, Jing Li, Tigang Ning
An ultrashort polarization beam splitter (PBS) is proposed based on liquid-filled dual-core photonic crystal fiber (DCPCF). The two cores of DCPCF are formed by two side elliptical holes and a central circular hole in the horizontal direction. The properties of the PBS are analyzed first with a non-filled DCPCF by the finite element method. Then, the performances of the PBS are discussed when the DCPCF is filled with liquids in the central hole. As a result, an ultrashort PBS is realized with a length of 78 μm when glycerol solution with a concentration of 37% is filled in the central hole...
May 10, 2018: Applied Optics
Quang Ho Dinh, Jacek Pniewski, Hieu Le Van, Aleksandr Ramaniuk, Van Cao Long, Krzysztof Borzycki, Khoa Dinh Xuan, Mariusz Klimczak, Ryszard Buczyński
A photonic crystal fiber (PCF) made of fused silica glass, infiltrated with carbon tetrachloride (CCl4 ), is proposed as a new source of supercontinuum (SC) light. Guiding properties in terms of effective refractive index, attenuation, and dispersion of the fundamental mode are studied numerically. As a result, two optimized structures are selected and verified against SC generation in detail. The dispersion characteristic of the first structure has the zero-dispersion wavelength at 1.252 μm, while the dispersion characteristic of the second structure is all-normal and equals -4...
May 10, 2018: Applied Optics
Xinran Dong, Haifeng Du, Xiaoyan Sun, Zhi Luo, Ji'an Duan
We have proposed a high sensitive photonic crystal fiber (PCF) strain sensor based on the Mach-Zehnder interferometer (MZI). The sensing head is formed by all-fiber in-line single mode-multimode-photonic-crystal-single mode fiber (SMPS) structure, using only the splicing method. Such a strain sensor exhibited a high sensitivity of -2.21 pm/με within a large measurement range of up to 5000 με and a large fringe visibility of up to 24 dB. Moreover, it was found that the strain sensitivity was weekly dependent of the length of PCF or MMF...
May 14, 2018: Sensors
Harshul Balani, Ghanshyam Singh, Manish Tiwari, Vijay Janyani, Ashish Kumar Ghunawat
This paper proposes a design and mathematical study of As2 S3 chalcogenide photonic crystal fiber (PCF) for broadband supercontinuum generation. The proposed design offers a large nonlinearity coefficient and ultra-flattened dispersion. The proposed design was analyzed using the full-vectorial finite element method. Through this method, it is shown that an ultra-broad supercontinuum spectrum of 0.8-4.5 μm is attained using an As2 S3 core PCF design with 20 fs pump pulse width and a length of 10 mm, having 3 kW power at a -40  dB spectral and temporal intensity...
May 1, 2018: Applied Optics
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