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- 摘要
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- 实验方案
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Exact optical solitons of Radhakrishnan–Kundu–Lakshmanan equation with Kerr law nonlinearity
摘要： A new generalized exponential rational function method (GERFM) is used to acquire some new optical solitons of Radhakrishnan–Kundu–Lakshmanan (RKL) equation with Kerr nonlinearity. This equation is used to model propagation of solitons through an optical fiber. The well-known exponential rational function method is also a special case of the GERFM. The results reveal that the mentioned method is efficient and simple for solving different nonlinear partial differential equations.
关键词： GERFM,traveling wave solutions,RKL,Optical solitons
更新于2025-09-19 17:15:36
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Mutual transitions between stationary and moving dissipative solitons
摘要： Application of stable localized dissipative solitons as basic carriers of information promises the significant progress in the development of new optical communication networks. The success development of such systems requires getting the full control over soliton waveforms. In this paper we use the fundamental model of dissipative solitons in the form of the complex Ginzburg-Landau equation with a potential term to demonstrate controllable transitions between different types of coexisted waveforms of stationary and moving dissipative solitons. Namely, we consider mutual transitions between so-called plain (fundamental soliton), composite, and moving pulses. We found necessary features of transverse spatial distributions of locally applied (along the propagation distance) attractive potentials to perform those waveform transitions. We revealed that a one-peaked symmetric potential transits the input pulses to the plain pulse, while a two-peaked symmetric (asymmetric) potential performs the transitions of the input pulses to the composite (moving) pulse.
关键词： Control potential,Dissipative solitons,Waveform transitions,Complex Ginzburg-Landau equation
更新于2025-09-19 17:15:36
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Generation and pulsating behaviors of loosely bound solitons in a passively mode-locked fiber laser
摘要： We demonstrate the experimental observation of loosely bound solitons and pulsations in a passively mode-locked ?ber laser. The soliton amount inside one soliton bunch typically increases with the increment of pump power, while the average pulse-to-pulse separation in the regime of hundreds of picoseconds decreases in principle accordingly. Besides, by employing the real-time measurement based on the dispersive Fourier-transform technique, we ?nd that some solitons in a single bunch are experiencing a simultaneous pulsating process with a period corresponding to 100 times longer than the cavity round-trip time. The experimental results can be bene?cial for better understanding the formation of multiple solitons and pulsating solitons and enriching the nonlinear phenomena in complex soliton systems.
关键词： dispersive Fourier-transform technique,pulsating solitons,loosely bound solitons,passively mode-locked ?ber laser
更新于2025-09-19 17:13:59
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Soliton generation in optical fiber networks
摘要： We consider the problem of soliton generation in branched optical fibers. A model based on the nonlinear Schrodinger equation on metric graphs is proposed. Number of generated solitons is computed for different branching topologies considering different initial pulse profiles. Experimental realization of the model is discussed.
关键词： optical solitons,optical fiber network,soliton transport,pulse generation
更新于2025-09-19 17:13:59
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Nonlinear Optics - Novel Results in Theory and Applications || Polarization Properties of the Solitons Generated in the Process of Pulse Breakup in Twisted Fiber Pumped by ns Pulses
摘要： Common optical fibers are randomly birefringent, and solitons formatting and traveling in them are randomly polarized. However, it is desirable to have solitons with a well-defined polarization. With pump relatively long pulses, the nonlinear effects of modulation instability (MI) and stimulated Raman scattering (SRS) are dominant at the initial stage of the process of supercontinuum (SC) generation; modulation instability results in pulse breakup and formation of short pulses that evolve finally to a bunch of solitons and dispersive waves. We do the research of the polarization of solitons formed by the pulse breakup process by the effect of modulation instability with pump pulses of nanoseconds in standard fiber (SMF-28) with circular birefringence introduced by fiber twist, and the twisted fiber mitigates the random linear birefringence. In this work, we found that polarization ellipticity of solitons is distributed randomly; nevertheless, the average polarization ellipticity is closer to the circular than the polarization ellipticity of the input pulse. In the experimental setup. 200 m of SMF-28 fiber twisted by 6 turns/m was used. We used 1 ns pulse to pump the fiber. The results showed that at circular polarization of the input pulse solitons at the fiber output have polarizations close to the circular, while in the fiber without twist, the soliton polarization was random.
关键词： pulse propagation and temporal solitons,birefringence and polarization,fiber optic,stimulated Raman scattering,nonlinear optics
更新于2025-09-19 17:13:59
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Optical solitons with nonlocal-parabolic combo nonlinearity by Lie symmetry analysis coupled with modified G′/G-expansion
摘要： This paper obtains optical soliton solutions with parabolic law nonlinearity coupled in nonlocal nonlinear medium. Lie symmetry analysis coupled with modified G′/G-expansion scheme retrieves these solitons.
关键词： Parabolic law,Weakly nonlocal nonlinearity,Modified G′/G-expansion,Lie symmetry,Solitons
更新于2025-09-19 17:13:59
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[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Repetition Rate Adjustable Dual-wavelength Solitons Fiber Laser Based on Highly Nonlinear Fiber
摘要： A dual-wavelength soliton ?ber ring laser with adjustable repetition rate was reported. Through adding highly nonlinear ?ber (HNLF) as nonlinear medium in the ?ber ring cavity, the dual-wavelength bright-dark soliton pair can be formed. The 1st to 4th, 5th to 8th and 9th to 11th harmonics bright-dark solitons pairs were obtained by rotating the Polarization controller (PC) when the power are 160 mW, 230 mW and 340 mW, respectively. To investigate the in?uence of loss on the laser system, a variable optical attenuator (VOA) was embedded in the ring laser cavity. Then the dual-wavelength with Kelly sidebands was obtained by properly adjusting the PC and VOA. The center wavelengths of the dual-wavelength laser were located at 1557.8 nm and 1568.5 nm and the 3 dB bandwidths of two wavelengths are 2.2 nm and 2.1 nm, respectively. The spacing between the two wavelengths was 10.7 nm. Due to the existence of nonlinearity, the 1st to 22th harmonics bright solitons sequence (corresponding to the repetition rate tunable from 196.8 kHz to 4.33 MHz) was obtained by increasing the pump power. The intervals of bright-dark solitons pair and bright solitons all were 5.08 μs, which corresponds to fundamental repetition rates are 196.8 kHz. The signal-to-noise ratio of the bright solitons was approximately 58 dB, which means the operation of laser was stable.
关键词： harmonic solitons,dual-wavelength soliton,adjustable repetition rate,fiber ring laser,highly nonlinear fiber,bright-dark soliton pair
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Sozopol, Bulgaria (2019.9.6-2019.9.8)] 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Amplifier Diodes Designed in Fiber Bragg Gratings
摘要： A self-consistent problem of the wave interaction in an amplifying dynamic nonlinear medium with relaxation gives soliton-like solutions for both the envelope of the light intensity and the spatial profile of the photo-induced grating of the refractive index. Such a nonuniform amplitude envelope of spatially extended grating can be used to create amplifying diodes for laser pulses based on a fiber Bragg grating (FBG).
关键词： dissipative solitons,wave-mixing,fiber Bragg gratings
更新于2025-09-19 17:13:59
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Multicore-fiber solitons and laser-pulse self-compression at light-bullet excitation in the central core of multicore fibers
摘要： The propagation of laser pulses in multicore fibers (MCFs) made of a central core and an even number of cores located in a ring around it is studied. Approximate quasisoliton homogeneous solutions of the wave field in the MCF considered are found. The stability of the in-phase soliton distribution is shown analytically and numerically. At low energies, its wave field is distributed over all MCF cores and has a duration that exceeds the duration of the nonlinear Schr?dinger equation (NSE) soliton with the same energy by many (i.e., five to six) times. In contrast, almost all of the radiation at high energies is concentrated in the central core with a duration similar to the NSE soliton. The transition between the two types of distributions is very sharp and occurs at a critical energy, which is weakly dependent on the number of cores and on the coupling coefficient with the central core. The self-compression mechanism of laser pulses was proposed. It consists in injecting such MCFs with a wave packet being similar to the found soliton and having an energy larger than the critical value. It is shown that the compression ratio depends weakly on the energy and the number of cores and is approximately equal to six times with an energy efficiency of almost 100%. The use of longer laser pulses allows one to increase the compression ratio up to 30–40 times with an energy efficiency of more than 50%. The obtained analytical estimates of the compression ratio and its efficiency are in good agreement with the results of a numerical simulation.
关键词： light-bullet excitation,laser-pulse self-compression,nonlinear Schr?dinger equation,multicore fibers,solitons
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Infrared 1000-nm-Supercontinuum by Means of Self-Frequency Shift of Raman Solitons Supported by Four-Wave Mixing
摘要： Infrared spectroscopy is deployed in various fields of science and technology such as organic and inorganic chemistry, monitoring of greenhouse gases, food industry, artwork conservation, and analysis of polymers and semiconductor microelectronics [1]. The supercontinuum generation based on self-frequency shift (SFS) of Raman solitons in various optical fibres is a technology to provide promising spectra for infrared spectroscopy applications. However, these spectra are restricted in range due to the limitations of Raman gain spectrum and optical absorption in silica fibres beyond the C band. Thus, they hardly spread over 300 nm if starting from around 1550 nm [2]. However, as I show here using numerical simulations of the Generalised Nonlinear Schr?dinger Equation, if the SFS of Raman solitons is supported by the effect of four-wave mixing (FWM), the range of such supercontinuum can increase up to 1000 nm counteracting the limits of Raman gain and optical absorption.
关键词： four-wave mixing,Infrared spectroscopy,self-frequency shift,Raman solitons,supercontinuum generation
更新于2025-09-16 10:30:52