scholarly journals Nonlinear Optical Fibers, Their Properties, and Applications

2020 ◽  
Vol 6 (2) ◽  
pp. 121-126
Author(s):  
B. R. Ghimire
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Nonlinear Optical ◽  
Group Velocity Dispersion ◽  
Wavelength Dependence ◽  
Experimental Result ◽  
Material Dispersion ◽  
Waveguide Dispersion ◽  
Wavelength Absorption

Nonlinear optical properties and preparation of nonlinear optical fiber based on Bismuth oxide were described. Wavelength dependence of refractive index of ABH160 and B027 was studied and analyzed. Working and construction of optical ON-OFF switches, based on Bi-HNLF was reported. It was investigated that refractive index of ABH160 and Bo27 were found to be exponentially decaying as a function of wavelength. Absorption coefficient of ABH160 as a function of wavelength was found to be decaying exponentially. In optical fiber the total group velocity dispersion is divided into the material dispersion DM and waveguide dispersion DW. Material dispersion and waveguide dispersion were calculated theoretically and a good agreement with the experimental result. The process of four wave mixing and consequences was reviewed.

Nonlinear Optical Interactions in Optical Fibers

1998 ◽  
Vol 07 (01) ◽  
pp. 105-112 ◽  
Author(s):  
Robert W. Boyd ◽  
Eric L. Buckland
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Optical Switching ◽  
Nonlinear Optical ◽  
Pulse Propagation ◽  
Fiber Type ◽  
Kerr Nonlinearity ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Physical Processes

We report on our research program aimed at clarifying the physical processes leading to the nonlinear optical response of silica optical fibers and at studying the implications of optical nonlinearities on optical pulse propagation and optical switching devices. The dominant physical processes leading to the nonlinear optical response of an optical fiber are nonresonant electronic polarization, with essentially instantaneous response, the Raman interaction, with sub-picosecond response, and electrostriction, with nanosecond response. We present experimental results that show the consequence of each of these processes on the propagation of a light pulse through an optical fiber. We have also performed one of the first direct measurements of the electrostrictive contribution to the nonlinear refractive index of optical fibers. We measure values ranging from 1.5 × 10-16 to 5.8 × 10-16 cm2/W , depending on fiber type. These values are comparable to that of the fast, Kerr nonlinearity (i.e., sum of electronic and Raman contributions) of 2.5 × 10-16 cm2/W . The measured electrostrictive nonlinearities are significantly larger than those predicted by simple models, and the possible explanations of this difference are discussed.

scholarly journals Application of the G'/G Expansion Method in Ultrashort Pulses in Nonlinear Optical Fibers

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Jiang Xing-Fang ◽  
Wang Jun ◽  
Wei Jian-Ping ◽  
Hua Ping
Keyword(s):  
Optical Fibers ◽  
Wavelength Division Multiplexing ◽  
Nonlinear Optical ◽  
Group Velocity Dispersion ◽  
Ultrashort Pulses ◽  
Expansion Method ◽  
Input Power ◽  
Trigonometric Function ◽  
High Order ◽  
Wavelength Division

With the increasing input power in optical fibers, the dispersion problem is becoming a severe restriction on wavelength division multiplexing (WDM). With the aid of solitons, in which the shape and speed can remain constant during propagation, it is expected that the transmission of nonlinear ultrashort pulses in optical fibers can effectively control the dispersion. The propagation of a nonlinear ultrashort laser pulse in an optical fiber, which fits the high-order nonlinear Schrödinger equation (NLSE), has been solved using the G'/G expansion method. Group velocity dispersion, self-phase modulation, the fourth-order dispersion, and the fifth-order nonlinearity of the high-order NLSE were taken into consideration. A series of solutions has been obtained such as the solitary wave solutions of kink, inverse kink, the tangent trigonometric function, and the cotangent trigonometric function. The results have shown that the G'/G expansion method is an effective way to obtain the exact solutions for the high-order NLSE, and it provides a theoretical basis for the transmission of ultrashort pulses in nonlinear optical fibers.

Lie Symmetry Reductions and Analytic Solutions for the AB System in a Nonlinear Optical Fiber

2019 ◽  
Vol 14 (11) ◽  
Author(s):  
Song-Hua Hu ◽  
Bo Tian ◽  
Xia-Xia Du ◽  
Zhong Du ◽  
Xiao-Yu Wu
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Optical Communication ◽  
Nonlinear Optical ◽  
Occupation Number ◽  
Analytic Solutions ◽  
Lie Symmetry ◽  
Atomic Inversion ◽  
Short Pulses ◽  
Symmetry Reductions

Abstract In the optical communication, people use the optical fibers to achieve the high bit-rate data transmission. In this paper, the AB system for the ultra-short pulses in a nonlinear optical fiber is investigated via the Lie symmetry analysis. Lie symmetries and symmetry reductions are derived via the Lie algorithm. Periodic- and solitary-wave solutions are obtained via the qualitative consideration. For the magnitude of the electric field in the optical fiber and the function associated with the occupation number which gives a measure of the atomic inversion in the nonlinear optical fiber, we can adjust the amplitudes, widths, and velocities of the solitary waves via the Lie symmetry transformations. The results would help the engineers select the ultra-short pulses in the optical communication.

scholarly journals Design and Dispersion Control of Microstructured Multicore Tellurite Glass Fibers with In-Phase and Out-of-Phase Supermodes

Photonics ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 113
Author(s):  
Elena A. Anashkina ◽  
Alexey V. Andrianov
Keyword(s):  
Optical Fibers ◽  
Nonlinear Optical ◽  
Tellurite Glass ◽  
Group Velocity Dispersion ◽  
Glass Fibers ◽  
Large Coupling ◽  
Nonlinear Properties ◽  
Core Fiber ◽  
Analysis Of Dispersion ◽  
Er Doped

High nonlinearity and transparency in the 1–5 μm spectral range make tellurite glass fibers highly interesting for the development of nonlinear optical devices. For nonlinear optical fibers, group velocity dispersion that can be controlled by microstructuring is also of great importance. In this work, we present a comprehensive numerical analysis of dispersion and nonlinear properties of microstructured two-, four-, six-, and eight-core tellurite glass fibers for in-phase and out-of-phase supermodes and compare them with the results for one-core fibers in the near- and mid-infrared ranges. Out-of-phase supermodes in tellurite multicore fibers are studied for the first time, to the best of our knowledge. The dispersion curves for in-phase and out-of-phase supermodes are shifted from the dispersion curve for one-core fiber in opposite directions; the effect is stronger for large coupling between the fields in individual cores. The zero dispersion wavelengths of in-phase and out-of-phase supermodes shift to opposite sides with respect to the zero-dispersion wavelength of a one-core fiber. For out-of-phase supermodes, the dispersion can be anomalous even at 1.55 μm, corresponding to the operating wavelength of Er-doped fiber lasers.

scholarly journals Examination of the Implementation and Utilization of Optical Fibers Beams: A Review

2021 ◽  
Vol 8 (1) ◽  
pp. 201-206
Author(s):  
Mazullah Karimi
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Light Propagation ◽  
Monochromatic Light ◽  
Chemical Vapor ◽  
Refractive Index Profile ◽  
Typical Application ◽  
Processing Power ◽  
Natural Forms

For light propagation purposes, the optical fibers that are known as waveguides can be applied. A glass or plastic film called cladding covers the central portion of the optical fiber, and is distinguished by a refractive index that is lower relative to the main refractive index. For the fine confines of the light inside the waveguide, the overall internal reflection phenomena are necessary. It is possible to categorize optical fibers according to shape, number of modes, refractive index profile, dispersion, signal processing power, and polarization. We are concentrating on the first three typical forms of optical fibers in this article. This may be used in fiber beams as a typical application of fibers to generate and intensify a small, powerful beam of coherent and monochromatic light. Optical fiber processing requires three steps, such as the development of performs. The process of adjusted chemical vapor deposition (MCVD) is a recognized technique that can be used to manufacture optical fibers. Optical fiber sensors are well known in optics and photonics for their large variety of applications. Optical biosensors can be developed as a sensing application focused on refractive index changes that are commonly utilized for the identification of biomolecules in their natural forms.

scholarly journals Reflective Properties of a Polymer Micro-Transducer for an Optical Fiber Refractive Index Sensor

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6964
Author(s):  
Paweł Marć ◽  
Monika Żuchowska ◽  
Leszek R. Jaroszewicz
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Fiber Type ◽  
Optical Fiber Sensor ◽  
Refractive Index Sensor ◽  
Light Sources ◽  
New Class ◽  
Multi Mode ◽  
Selection Of

A polymer microtip manufactured at the end of a multi-mode optical fiber by using the photopolymerization process offers good reflective properties, therefore, it is applicable as an optical fiber sensor micro-transducer. The reflective properties of this microelement depend on the monomer mixture used, optical fiber type, and light source initiating polymerization. Experimental results have shown that a proper selection of these parameters has allowed the design of a new class of sensing structure which is sensitive to the refractive index (RI) changes of a liquid medium surrounding the microtip. An optical backscatter reflectometer was applied to test a group of micro-transducers. They were manufactured from two monomer mixtures on three different types of multi-mode optical fibers. They were polymerized by means of three optical light sources. Selected micro-transducers with optimal geometries were immersed in reference liquids with a known RI within the range of 1.3–1.7. For a few sensors, the linear dependences of return loss and RI have been found. The highest sensitivity was of around 208 dB/RIU with dynamic 32 dB within the range of 1.35–1.48. Sensing characteristics have minima close to RI of a polymer microelement, therefore, changing its RI can give the possibility to tune sensing properties of this type of sensor.

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