scholarly journals Twisted Silica Microstructured Optical Fiber with Equiangular Spiral Six-Ray Geometry

Fibers ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 27
Author(s):  
Anton V. Bourdine ◽  
Alexey Yu. Barashkin ◽  
Vladimir A. Burdin ◽  
Michael V. Dashkov ◽  
Vladimir V. Demidov ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Near Field ◽  
Outer Diameter ◽  
Microstructured Optical Fibers ◽  
Transmission Parameters ◽  
Microstructured Optical Fiber ◽  
Drawing Speed ◽  
Ray Geometry ◽  
Equiangular Spiral

This work presents fabricated silica microstructured optical fiber with special equiangular spiral six-ray geometry, an outer diameter of 125 µm (that corresponds to conventional commercially available telecommunication optical fibers of ratified ITU-T recommendations), and induced chirality with twisting of 200 revolutions per minute (or e.g., under a drawing speed of 3 m per minute, 66 revolutions per 1 m). We discuss the fabrication of twisted microstructured optical fibers. Some results of tests, performed with pilot samples of designed and manufactured stellar chiral silica microstructured optical fiber, including basic transmission parameters, as well as measurements of near-field laser beam profile and spectral and pulse responses, are represented.

Supercontinuum generation in chalcogenide layered spiral microstructured optical fiber

2017 ◽  
Vol 26 (04) ◽  
pp. 1750049 ◽  
Author(s):  
Sílvia M. G. Rodrigues ◽  
Margarida Facão ◽  
Mário F. S. Ferreira
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Short Distance ◽  
Light Propagation ◽  
Nonlinear Characteristics ◽  
Arsenic Trisulfide ◽  
Microstructured Optical Fibers ◽  
Microstructured Optical Fiber ◽  
Highly Nonlinear ◽  
Record Value

The layered spiral microstructured optical fiber (LS-MOF) design allows higher nonlinearities than the most common microstructured optical fibers. Here, we have chosen a highly nonlinear glass for its composition, the arsenic trisulfide, and we have determined its dispersion and nonlinear characteristics. After adjusting the fiber’s parameters, we obtained a record value for the nonlinear parameter of 50.7[Formula: see text]W[Formula: see text]m[Formula: see text], at 1.550[Formula: see text][Formula: see text]m. We have simulated light propagation under these optimized circumstances, achieving a broad supercontinuum, extending from 500[Formula: see text]nm to 3900[Formula: see text]nm, in a very short distance: 0.3[Formula: see text]mm.

Analytic Study of Non-Newtonian Double Layer Coating Liquid Flows in Optical Fiber Manufacturing

2012 ◽  
Vol 224 ◽  
pp. 260-263 ◽  
Author(s):  
Kyoung Jin Kim ◽  
Ho Sang Kwak
Keyword(s):  
Optical Fiber ◽  
Glass Fiber ◽  
Double Layer ◽  
Optical Fibers ◽  
Newtonian Fluid ◽  
Liquid Flow ◽  
Analytic Study ◽  
Fiber Drawing ◽  
Drawing Speed ◽  
Layer Coating

In mass manufacturing of optical fibers, the wet-on-wet polymer resin coating is an efficient process for applying double layer coatings on the glass fiber. This paper presents an analytic study on the behavior of non-Newtonian polymer resins in the double layer coating liquid flow inside a secondary coating die of the optical fiber coating applicator. Based the approximations of fully developed laminar flow and the power law model of non-Newtonian fluid, the coating liquid flow of two immiscible resin layers is modeled for the simplified geometry of capillary annulus, where the surface of glass fiber moves at high fiber drawing speed. The effects of important parameters such as non-Newtonian fluid properties, the coating die size, and fiber drawing speed are investigated on the resin velocity profiles and secondary coating layer thickness.

scholarly journals Optical Fiber Sensors Based on Microstructured Optical Fibers to Detect Gases and Volatile Organic Compounds—A Review

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2555
Author(s):  
Diego Lopez-Torres ◽  
Cesar Elosua ◽  
Francisco J. Arregui
Keyword(s):  
Volatile Organic Compounds ◽  
Optical Fiber ◽  
Organic Compounds ◽  
Optical Fibers ◽  
Direct Interaction ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Microstructured Optical Fibers ◽  
Sensing Applications ◽  
Volatile Organic

Since the first publications related to microstructured optical fibers (MOFs), the development of optical fiber sensors (OFS) based on them has attracted the interest of many research groups because of the market niches that can take advantage of their specific features. Due to their unique structure based on a certain distribution of air holes, MOFs are especially useful for sensing applications: on one hand, the increased coupling of guided modes into the cladding or the holes enhances significantly the interaction with sensing films deposited there; on the other hand, MOF air holes enhance the direct interaction between the light and the analytes that get into in these cavities. Consequently, the sensitivity when detecting liquids, gasses or volatile organic compounds (VOCs) is significantly improved. This paper is focused on the reported sensors that have been developed with MOFs which are applied to detection of gases and VOCs, highlighting the advantages that this type of fiber offers.

Extending the Possibilities of Near-Field Scanning Optical Microscopy for Simultaneous Topographical and Chemical Force Imaging

1999 ◽  
Vol 584 ◽  
Author(s):  
N. Nagy ◽  
M. C. Goh
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Microcontact Printing ◽  
Near Field ◽  
Optical Microscope ◽  
Optical Probe ◽  
Germanium Dioxide ◽  
Fiber Optic Probe ◽  
Pure Silica ◽  
Near Field Scanning

AbstractThe Near-field Scanning Optical Microscope (NSOM) is an innovative new form of surface microscopy, which can be used to obtain local spectroscopic information about surfaces, enabling the characterization of nanometer-sized regions. The most important component of this instrument is the scanning probe tip. In this paper, we discuss the production of a novel fiber optic probe that can be used in local spectroscopy with an NSOM, but also for simultaneous imaging of topography and chemical forces. The probe consists of a bent, tapered silicon dioxide optical fiber. We have determined the rates of selective wet chemical etching of germanium dioxide doped pure silica optical fibers and used this information to optimize the probe etching process. A systematic approach for the development and testing of such probes is presented. The performance of the optical probes was characterized using surfaces prepared by the technique of microcontact printing. Phase and friction images of these surfaces were obtained using both standard atomic force microscopy tips and the optical fiber probe. The new optical probe was capable of distinguishing between different chemical regions on the patterned surface.

Ammonia Detection by Dye Immobilized Microstructured Optical Fiber

2011 ◽  
Vol 255-260 ◽  
pp. 2131-2135 ◽  
Author(s):  
Li Rong Peng ◽  
Xing Hua Yang ◽  
Li Bo Yuan ◽  
En Ming Zhao ◽  
Le Li ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Optical Fiber Sensor ◽  
Gaseous Ammonia ◽  
Polymer Optical Fiber ◽  
Microstructured Optical Fiber ◽  
Response Range ◽  
Ammonia Detection ◽  
Polymer Optical Fibers ◽  
Minor Reaction

An optical ammonia probe was fabricated based on Microstructured Polymer Optical Fiber (MPOFs) modified by eosin doped silica gel films.The structure of this probe was based on microstructured polymer optical fibers with microholes and these microholes could be used as the substrate of sensing materials and minor reaction pools. The sensing properties of the optical fiber sensor to gaseous ammonia were investigated at room temperature. The sensing probe showed different fluorescence intensity at 576 nm to different concentrations of trace ammonia in carrier gas of nitrogen. The response range was 20-350 ppm, with short response time within 600 ms.

Optical Fibers with Patterned ZnO/Electrode Coatings for Flexural Actuators

1996 ◽  
Vol 459 ◽  
Author(s):  
S. Trolier-McKinstry ◽  
G. R. Fox ◽  
A. Kholkin ◽  
C. A. P. Muller ◽  
N. Setter
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Near Field ◽  
Shadow Mask ◽  
Clean Room ◽  
Processing Scheme ◽  
Fiber Alignment ◽  
Device Geometry

ABSTRACTPiezoelectric ZnO coatings were used in this work to develop a flexural actuator for an optical fiber. The basic device geometry was as follows: inner Cr/Au electrodes were evaporated onto a cleaned optical fiber; a thick ZnO coating was then grown by sputtering; finally a set of 2mm ring top electrodes were deposited through a shadow mask. Flexural actuators were made by photolithographically patterning either the inner or outer Cr/Au drive electrodes so that it was split down the length of the fiber. This enables each half of the fiber to be actuated independently. The result is that the optical fiber is forced to flex.A processing scheme by which 30 μm gaps could be patterned into the electrodes was developed using standard clean room techniques. Such flexural actuators are attractive for scanning near field optical microscopes and in fiber alignment devices.

scholarly journals Researches of Parameters of Chiral Few-Mode Optical Fiber Pilot Sample with Improved Height of Step Refractive Index Profile

2021 ◽  
Vol 7 (1) ◽  
pp. 6-19
Author(s):  
A. Bourdine ◽  
A. Barashkin ◽  
V. Burdin ◽  
M. Dashkov ◽  
V. Demidov ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Near Field ◽  
Refractive Index Profile ◽  
Index Profile ◽  
Technological Parameters ◽  
Dispersion Parameters ◽  
Core Diameter ◽  
Pilot Sample

This work presents results of researhes of fabricated pilot sample of chiral few-mode optical fiber (FMF) with induced twisting of 10 and 66 revolutions per meter, core diameter 11 µm (that almost corresponds to standard singlemode optical fibers), typical “telecommuniction” cladding diameter 125 µm and improved height of step refractive index profile. Proposed few-mode optical fiber supports 4 guided modes over “C”-band. We considered design and selection of desired technological parameters, based on results of computations, performed by both rigorous and approximation methods. Spectral curves of dispersion parameters are reprented as well as results of experimental measurements near-field laser beam profile and spectral and pulse responces of laser-excited optical signals.

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