scholarly journals Modal dynamics in multimode optical fibers: an attractor of high-order modes

2021 ◽  
Vol 29 (20) ◽  
pp. 32682
Author(s):  
Weitao He ◽  
Ruihuan Wu ◽  
Weiyi Hong ◽  
Aiping Luo
Keyword(s):  
Optical Fibers ◽  
High Order ◽  
Modal Dynamics

scholarly journals High-Order Polynomial Fitting Assistance for Fast Double-Peak Finding in Brillouin-Distributed Sensing

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 187
Author(s):  
Marcelo A. Soto ◽  
Alin Jderu ◽  
Dorel Dorobantu ◽  
Marius Enachescu ◽  
Dominik Ziegler
Keyword(s):  
Optical Fibers ◽  
High Order ◽  
Polynomial Fitting ◽  
Gaussian Fitting ◽  
Peak Finding ◽  
Fitting Method ◽  
Fold Reduction ◽  
Order Polynomial ◽  
Fitting In ◽  
Distributed Brillouin Sensor

A high-order polynomial fitting method is proposed to accelerate the computation of double-Gaussian fitting in the retrieval of the Brillouin frequency shifts (BFS) in optical fibers showing two local Brillouin peaks. The method is experimentally validated in a distributed Brillouin sensor under different signal-to noise ratios and realistic spectral scenarios. Results verify that a sixth-order polynomial fitting can provide a reliable initial estimation of the dual local BFS values, which can be subsequently used as initial parameters of a nonlinear double-Gaussian fitting. The method demonstrates a 4.9-fold reduction in the number of iterations required by double-Gaussian fitting and a 3.4-fold improvement in processing time.

scholarly journals ON THE APPLICATION OF A GENERALIZED VERSION OF THE DRESSING METHOD TO THE INTEGRATION OF VARIABLE COEFFICIENT N-COUPLED NONLINEAR SCHRÖDINGER EQUATION

2012 ◽  
Vol 19 (04) ◽  
pp. 1250028
Author(s):  
TING SU ◽  
HUIHUI DAI ◽  
XIAN GUO GENG
Keyword(s):  
Optical Fibers ◽  
Variable Coefficient ◽  
High Order ◽  
Explicit Solutions ◽  
Compatibility Conditions ◽  
Dressing Method ◽  
Integrable Equations ◽  
Nonlinear Schrödinger ◽  
Coupled Nonlinear Schrödinger Equation ◽  
Hirota Equations

N-coupled nonlinear Schrödinger (NLS) equations have been proposed to describe N-pulse simultaneous propagation in optical fibers. When the fiber is nonuniform, N-coupled variable-coefficient NLS equations can arise. In this paper, a family of N-coupled integrable variable-coefficient NLS equations are studied by using a generalized version of the dressing method. We first extend the dressing method to the versions with (N + 1) × (N + 1) operators and (2N + 1) × (2N + 1) operators. Then, we obtain three types of N-coupled variable-coefficient equations (N-coupled NLS equations, N-coupled Hirota equations and N-coupled high-order NLS equations). Then, the compatibility conditions are given, which insure that these equations are integrable. Finally, the explicit solutions of the new integrable equations are obtained.

scholarly journals High-order mode suppression in double-clad optical fibers by adding absorbing inclusions

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Svetlana S. Aleshkina ◽  
Tatiana A. Kochergina ◽  
Vladimir V. Velmiskin ◽  
Konstantin K. Bobkov ◽  
Mikhail M. Bubnov ◽  
...  
Keyword(s):  
Optical Fibers ◽  
High Order Mode ◽  
High Order ◽  
Order Mode ◽  
Mode Suppression

Intensity profile stabilities of high order vectorial modes of optical fibers

Optik ◽  
2017 ◽  
Vol 149 ◽  
pp. 277-287 ◽  
Author(s):  
Yuzhao Ma ◽  
Jiuzhi Xu ◽  
Huiliang Gao ◽  
Xinglong Xiong
Keyword(s):  
Optical Fibers ◽  
High Order ◽  
Intensity Profile

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.

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