Propagation of Light and Modes in Optical Fibers

2013 ◽  
pp. 65-78
Author(s):  
Valerii Ter-Mikirtychev
Keyword(s):  
Optical Fibers ◽  
Propagation Of Light

scholarly journals Deep Learning for Computational Mode Decomposition in Optical Fibers

2020 ◽  
Vol 10 (4) ◽  
pp. 1367
Author(s):  
Stefan Rothe ◽  
Qian Zhang ◽  
Nektarios Koukourakis ◽  
Jürgen W. Czarske
Keyword(s):  
Neural Network ◽  
Optical Fibers ◽  
High Performance ◽  
Deep Neural Network ◽  
Light Propagation ◽  
Training Data ◽  
Steady Increase ◽  
Cyberphysical Systems ◽  
Multimode Fibers ◽  
Propagation Of Light

Multimode fibers are regarded as the key technology for the steady increase in data rates in optical communication. However, light propagation in multimode fibers is complex and can lead to distortions in the transmission of information. Therefore, strategies to control the propagation of light should be developed. These strategies include the measurement of the amplitude and phase of the light field after propagation through the fiber. This is usually done with holographic approaches. In this paper, we discuss the use of a deep neural network to determine the amplitude and phase information from simple intensity-only camera images. A new type of training was developed, which is much more robust and precise than conventional training data designs. We show that the performance of the deep neural network is comparable to digital holography, but requires significantly smaller efforts. The fast characterization of multimode fibers is particularly suitable for high-performance applications like cyberphysical systems in the internet of things.

Optical solitons in (n + 1) dimensions with Kerr and power law nonlinearities

2017 ◽  
Vol 31 (15) ◽  
pp. 1750186 ◽  
Author(s):  
Muhammad Younis
Keyword(s):  
Optical Fibers ◽  
Power Law ◽  
Schrodinger Equation ◽  
Optical Solitons ◽  
Nonlinear Schrodinger Equation ◽  
Bright Soliton ◽  
Light Pulses ◽  
Propagation Of Light ◽  
First Time ◽  
Expansion Scheme

The paper studies the dynamics of optical solitons in [Formula: see text]-dimensional nonlinear Schrödinger equation with Kerr and power law nonlinearities that describe the propagation of light pulses in optical fibers. First time the dark and singular optical solitons are extracted in [Formula: see text] dimensions. The [Formula: see text]-expansion scheme is used to analyze these solutions. Additionally, the constraint conditions for the existence of the solutions are also listed. However, the scheme fails to retrieve the bright soliton.

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

2019 ◽  
Vol 127 (9) ◽  
pp. 477
Author(s):  
А.А. Маковецкий ◽  
А.А. Замятин ◽  
Д.В. Ряховский
Keyword(s):  
Optical Properties ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Scattered Radiation ◽  
Fiber Length ◽  
Numerical Aperture ◽  
Optical Losses ◽  
Laser Medicine ◽  
Propagation Of Light ◽  
Absorption Of Light

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.

Optical dark and singular solitons of generalized nonlinear Schrödinger’s equation with anti-cubic law of nonlinearity

2019 ◽  
Vol 33 (13) ◽  
pp. 1950158 ◽  
Author(s):  
Nauman Raza ◽  
Asad Zubair
Keyword(s):  
Optical Fibers ◽  
Soliton Solutions ◽  
Algebraic Method ◽  
Rational Solutions ◽  
Schrödinger’S Equation ◽  
Light Pulses ◽  
Propagation Of Light ◽  
Schrödinger's Equation ◽  
Nonlinear Schrodinger’S Equation ◽  
Nonlinear Schrödinger’S Equation

This work is devoted to scrutinize new optical soliton solutions to the spatially temporal [Formula: see text]-dimensional nonlinear Schrödinger’s equation (NLSE) with anti-cubic nonlinearity. Two different versatile integration architectures are used to extract these solitons. Extended direct algebraic method (EDAM) is utilized to pluck out optical, dark and singular soliton solutions, whereas generalized Kudryashov method (GKM) provides rational solutions. The fetched results are new and useful for the propagation of light pulses in optical fibers in [Formula: see text]-dimensions. For the existence of these solitons, constraint conditions are also listed.

Fiber Bragg Grating Growth Simulation Using an Inverse Scattering Matrix Approach

1999 ◽  
Vol 579 ◽  
Author(s):  
A. Manca ◽  
A. Anedda
Keyword(s):  
Inverse Scattering ◽  
Optical Fibers ◽  
Wave Theory ◽  
Scattering Matrix ◽  
Input Power ◽  
Process Models ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Propagation Of Light ◽  
Spatial Propagation

ABSTRACTFiber Bragg gratings are playing an important role in the field of optical telecommunications and sensors. We have simulated the growth of gratings, longitudinally written in the core of germanosilicate optical fibers by an Ar+ laser. Following a Kramer-Kronig model, absorption in the Germanium Oxygen deficient centers band (∼240 nm) is considered to be responsible for the fiber photosensitivity and a two photon absorption process models the dynamics of the refractive index variation.The spatial propagation of light along the grating is described by the coupled wave theory and is calculated by using an inverse scattering matrix technique. The predicted physical properties of the gratings, reflectivity and temporal dispersion of propagating light as a function of wavelength and input power, show that a sustained growth is possible. A good agreement with previous simulations and experiments is found.

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

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.

Nanophotonics of optical fibers

Nanophotonics ◽  
2013 ◽  
Vol 2 (5-6) ◽  
pp. 393-406 ◽  
Author(s):  
M. Sumetsky
Keyword(s):  
Integrated Circuits ◽  
Optical Fibers ◽  
Fiber Axis ◽  
Low Loss ◽  
Cross Sectional ◽  
Whispering Gallery ◽  
Propagation Of Light ◽  
Transparent Dielectric ◽  
Fiber Radius

AbstractThis review is concerned with nanoscale effects in highly transparent dielectric photonic structures fabricated from optical fibers. In contrast to those in plasmonics, these structures do not contain metal particles, wires, or films with nanoscale dimensions. Nevertheless, a nanoscale perturbation of the fiber radius can significantly alter their performance. This paper consists of three parts. The first part considers propagation of light in thin optical fibers (microfibers) having the radius of the order of 100 nanometers to 1 micron. The fundamental mode propagating along a microfiber has an evanescent field which may be strongly expanded into the external area. Then, the cross-sectional dimensions of the mode and transmission losses are very sensitive to small variations of the microfiber radius. Under certain conditions, a change of just a few nanometers in the microfiber radius can significantly affect its transmission characteristics and, in particular, lead to the transition from the waveguiding to non-waveguiding regime. The second part of the review considers slow propagation of whispering gallery modes in fibers having the radius of the order of 10–100 microns. The propagation of these modes along the fiber axis is so slow that they can be governed by extremely small nanoscale changes of the optical fiber radius. This phenomenon is exploited in SNAP (surface nanoscale axial photonics), a new platform for fabrication of miniature super-low-loss photonic integrated circuits with unprecedented sub-angstrom precision. The SNAP theory and applications are overviewed. The third part of this review describes methods of characterization of the radius variation of microfibers and regular optical fibers with sub-nanometer precision.

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