Исследование оптических свойств многомодового кварцевого оптического волокна с отражающей оболочкой из фторированного термопластичного полимера

Optical properties silica - polymeric optical fiber with a core with a diameter of 430 microns and the reflecting cover 70 microns thick from thermoplastic copolymer of a tetraftoretilen with ethylene (Tefzel brand) are experimentally investigated. The polymeric cover is applied on silica fiber with applicator from polimer melt directly on drowing tower. Optical losses of the fiber, a numerical aperture and its dependence on fiber length are measured. It is established that at propagation of light in fiber its noticeable scattering is observed. It is connected with crystallinity of polymeric cover. Distribution of intensity of scattered radiation along an axis of fiber and an indicatrix of dispersion of radiation by a coating are measured. Relative deposits of dispersion and absorption of light in a cover at the general optical losses of fiber are estimated. The possibility of use of optical fibers of this structure in laser medicine is considered.

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Fabrication of Lensed Plastic Optical Fiber Array Using Electrostatic Force

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4004204 ◽

2011 ◽

Vol 133 (3) ◽

Cited By ~ 1

Author(s):

Yih-Tun Tseng ◽

Jhong-Bin Huang ◽

Che-Hsin Lin ◽

Chin-Lung Chen ◽

Wood-Hi Cheng

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Electrostatic Force ◽

Coupling Efficiency ◽

Numerical Aperture ◽

Uv Curing ◽

Power Budget ◽

Fiber Array ◽

Plastic Optical Fibers ◽

Efficient Coupling

The GI (graded-index) POFs (Plastic optical fibers), which has been proven to reach distances as long as 1 km at 1.25 Gb/s has a relatively low numerical aperture . Therefore, the efficient coupling of GI POFs to the light source has become critical to the power budget in the system. Efficient coupling for a POFs system normally involves either a separate lens or the direct formation of the lens at the end of the fiber. Forming the lens-like structure directly on the fiber end is preferred for simplicity of fabrication and packaging, such as polishing and fusion, combine different fibers with the cascaded fiber method and hydroflouride (HF) chemical etching. These approaches are well established, but applicable only to glass. Optical assembly architecture for multichannel fibers and optical devices is critical to optical fiber interconnections. Multichannel fiber-pigtail laser diode (LD) modules have potential for supporting higher data throughput and longer transmission distances. However, to be of practical use, these modules must be more precise. This work proposes and manufactures lensed plastic optical fibers (LPOF) array. This novel manipulation can be utilized to fabricate an aspherical lens on a fiber array after the UV curing of the photo-sensitive polymer; the coupling efficiency (CE) is increased and exceeds 47% between the LD array and the fiber array.

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2 Loss Analysis in Optical Fiber Transmission

Sir Syed Research Journal of Engineering & Technology ◽

10.33317/ssurj.v5i1.52 ◽

2015 ◽

Vol 5 (1) ◽

pp. 6

Author(s):

Anusha Mushtaque ◽

Abi Waqas Memon ◽

Zarlish Mushtaq ◽

Aftab A. Memon ◽

B. S. Chowdhry

Keyword(s):

Optical Fiber ◽

Bit Error Rate ◽

Optical Loss ◽

Optical Fiber Transmission ◽

Optical Losses ◽

Power Meter ◽

Loss Analysis ◽

Propagation Of Light ◽

Optical Fiber Cable ◽

Fiber Segment

Most of telecommunication traffic (voice and data)around the globe is carried over the optical fiber cable. Theinternational traffic through various countries is carried overoptical fiber cables laid under the sea. Similarly the long-haultraffic within the country is through optical fiber laidunderground. Stress, strain, humidity, temperature, bending atacute angles affects the propagation of light energy in the opticalfiber cable. All such factors increase the optical loss andattenuate the signal. The attenuation, especially in the long-haulcommunication increases the bit error rate and degrades thequality of service. In this paper, different optical losses areanalyzed by setting up several experiments at a single modeoptical fiber spool of 4 km. The optical fiber segment wassubjected to various stress, temperatures and acute bendingconditions. The resulting losses and degradation of the signal wasmeasured using OTDR and Power meter.

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Quartz-quartz type light guides with low losses and a thin polymer shell for the near-IR spectral range.

Journal of Radio Electronics ◽

10.30898/1684-1719.2021.9.7 ◽

2021 ◽

Vol 2021 (9) ◽

Author(s):

I.P. Shilov ◽

◽

A.A. Zamyatin ◽

A.A. Makovetsky ◽

L.Yu. Kochmarev ◽

...

Keyword(s):

Optical Fibers ◽

Spectral Range ◽

Fiber Type ◽

Numerical Aperture ◽

Fluorine Content ◽

Fluorine Concentration ◽

Laser Medicine ◽

Near Ir ◽

Study Results ◽

Light Guides

The issues of obtaining silica optical fibers with SiO2/SiO2-F composition (where SiO2 is a core, and SiO2-F is a light-reflecting cladding) with low optical losses for the near-IR spectral range are considered. This fiber type is widely used in various fields of science and technology, including laser medicine. The study results of the dependence of the numerical aperture and fluorine concentration in silica glass of the formed fiber preforms on the Freon (C3F8) consumption in the gas phase when using a waveguide-type microwave plasmotron at the H10 wavelength, are presented. It is showed that to increase the fluorimeters sensitivity in the near-IR spectral range as probe fibers for detecting luminescence, it is promising to use quartz-quartz fibers with the “Heraeus” glass core and the reflective SiO2-F cladding with an increased fluorine content in the glass (up to 7 wt. %). In this case, the numerical aperture of such fibers will reach values up to 0.32. For laser procedures in ophthalmology, surgery, phlebology and etc., optical fibers with a standard numerical aperture 0.20-0.24 can be used (with a fluorine concentration in the glass up to 3 wt. %).

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Study of the propagation of a light beam at the exit of a single-mode and multimode optical fiber

Revista Mexicana de Física E ◽

10.31349/revmexfise.18.28 ◽

2021 ◽

Vol 18 (1) ◽

pp. 28

Author(s):

J. C. Natividad ◽

H. H. Cerecedo Núñez ◽

P. Padilla Sosa

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Optical Sensors ◽

Light Propagation ◽

Computational Modelling ◽

Single Mode ◽

Field Distributions ◽

Propagation Of Light ◽

Intensity Field ◽

Communication Lines

Traditionally, optical fibers have been used as communication lines and optical sensors; however, these have multiple other uses, for example, the interaction and entrapment of microparticles. This article studies the computational modelling of the propagation of light that comes out of conventional, single-mode and multimode optical fibers, which is of interest when studying the interaction of light with microparticles. As a parameter of analysis and quantification we use the degree of diffraction of the light propagation beams, at different distances from the optical fibers. Resulted intensity field distributions give us important microscopic information to consider for light interaction with such microparticles.

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Engineering nanoparticle features to tune Rayleigh scattering in nanoparticles-doped optical fibers

Scientific Reports ◽

10.1038/s41598-021-88572-2 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Victor Fuertes ◽

Nicolas Grégoire ◽

Philippe Labranche ◽

Stéphane Gagnon ◽

Ruohui Wang ◽

...

Keyword(s):

Optical Fiber ◽

Long Range ◽

Optical Fibers ◽

Rayleigh Scattering ◽

Distributed Sensing ◽

Optical Losses ◽

Sensing Applications ◽

Fiber Fabrication ◽

Silica Fibers ◽

Potential Applications

AbstractRayleigh scattering enhanced nanoparticles-doped optical fibers are highly promising for distributed sensing applications, however, the high optical losses induced by that scattering enhancement restrict considerably their sensing distance to few meters. Fabrication of long-range distributed optical fiber sensors based on this technology remains a major challenge in optical fiber community. In this work, it is reported the fabrication of low-loss Ca-based nanoparticles doped silica fibers with tunable Rayleigh scattering for long-range distributed sensing. This is enabled by tailoring nanoparticle features such as particle distribution size, morphology and density in the core of optical fibers through preform and fiber fabrication process. Consequently, fibers with tunable enhanced backscattering in the range 25.9–44.9 dB, with respect to a SMF-28 fiber, are attained along with the lowest two-way optical losses, 0.1–8.7 dB/m, reported so far for Rayleigh scattering enhanced nanoparticles-doped optical fibers. Therefore, the suitability of Ca-based nanoparticles-doped optical fibers for distributed sensing over longer distances, from 5 m to more than 200 m, becomes possible. This study opens a new path for future works in the field of distributed sensing, since these findings may be applied to other nanoparticles-doped optical fibers, allowing the tailoring of nanoparticle properties, which broadens future potential applications of this technology.

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Examination of optical fibers by the luminescent method in the scanning electron microscope (SEM)

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100111884 ◽

1984 ◽

Vol 42 ◽

pp. 360-361

Author(s):

Oliver C. Wells ◽

Philip J. Bailey

Keyword(s):

Optical Properties ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Optical Fiber ◽

Optical Fibers ◽

Total Internal Reflection ◽

Conducting Layer ◽

Recorded Image ◽

Luminescent Method ◽

Scanning Electron

Light is transmitted along the central core of an optical fiber by total internal reflection at the interface with the surrounding layer. Here, we describe a method by which the optical properties of a cross-sectioned fibre can be studied by means of the luminescent image in the scanning electron microscope (SEM).The sample is prepared by depositing a thin cathodoluminescent layer over the end of a broken or cross-sectioned optical fiber. A thin conducting layer is then deposited to prevent charging. The far end of the fiber is optically coupled to a photomultiplier. During examination in the SEM, the sample is scanned by a fine electron beam, which gives a localised source of light on the surface of the sample at the point of impact of the beam. The quantity of light that is transmitted along the fiber to the photomultiplier determines the brightness of that particular pixel in the recorded image.

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Analyzing Distributed Vibrating Sensing Technologies in Optical Meshes

Micromachines ◽

10.3390/mi13010085 ◽

2022 ◽

Vol 13 (1) ◽

pp. 85

Author(s):

Saifur Rahman ◽

Farman Ali ◽

Fazal Muhammad ◽

Muhammad Irfan ◽

Adam Glowacz ◽

...

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Light Signal ◽

Time Domain Reflectometry ◽

Signal Frequency ◽

Physical Parameters ◽

Optical Losses ◽

Conventional Procedure ◽

Vibration Sensing ◽

The Impact

Hundreds of kilometers of optical fibers are installed for optical meshes (OMs) to transmit data over long distances. The visualization of these deployed optical fibers is a highlighted issue because the conventional procedure can only measure the optical losses. Thus, this paper presents distributed vibration sensing (DVS) estimation mechanisms to visualize the optical fiber behavior installed for OMs which is not possible by conventional measurements. The proposed technique will detect the power of light inside the optical fiber, as well as different physical parameters such as the phase of transmitted light inside the thread, the frequency of vibration, and optical losses. The applicability of optical frequency domain reflectometry (OFDR) and optical time-domain reflectometry (OTDR) DVS techniques are validated theoretically for various state detection procedures in optical fibers. The simulation model is investigated in terms of elapsed time, the spectrum of a light signal, frequency, and the impact of many external physical accidents with optical fibers.

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A Theoretical Study of Light Soliton Produced by Semiconductor Quantum Dot Waveguides and Propagation in Optical Fibers

Herald of the Bauman Moscow State Technical University Series Natural Sciences ◽

10.18698/1812-3368-2019-4-89-102 ◽

2019 ◽

pp. 89-102

Author(s):

O.P. Swami ◽

V. Kumar ◽

B. Suthar ◽

A.K. Nagar

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Energy Levels ◽

Optical Excitation ◽

Physical Parameters ◽

Optical Source ◽

Linear Interaction ◽

Propagation Of Light ◽

Non Linear ◽

The Stability

In this paper, the propagation of light soliton is studied in nonlinear optical fiber. We propose the external excitation of SQD waveguides through an optical source that allows the generation of solitary waves that are propagated through a non-linear optical fiber. The soliton formation is studied theoretically from the non-linear interaction between the external optical excitation and SQDs, considering SQDs as a quantum system of three energy levels. In this study, the Fourier Split-Step (FSS) method is used to solve numerically continuous nonlinear Schrodinger equation (NLSE) to evolution of the soliton pulse emitted by the SQDs inside an optical fiber with real physical parameters. The effect of SQDs density and electric field on the pulse width is also studied. Phase plane portraits are drawn for the stability of soliton in fiber and SQDs using software Matcont.

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