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[IEEE 2019 Systems of Signals Generating and Processing in the Field of on Board Communications - Moscow, Russia (2019.3.20-2019.3.21)] 2019 Systems of Signals Generating and Processing in the Field of on Board Communications - Simulation-Based Prediction of 100-μm-Core Multimode Optical Fiber Bandwidth for 10GBase-LX Systems
摘要： This work is concerned with application of earlier on developed an alternative method for simulation of piecewise regular multimode fiber optic links operating in a few-mode regime for computation of laser-excited optical pulse dynamics during its propagation over irregular silica graded- index multimode optical fibers (MMFs) with extremely large core diameter. Proposed model is based on the piecewise regular representation, and it takes into account launching conditions, differential mode delay, both lower- and higher- order mode chromatic dispersion, differential mode attenuation, mode mixing and power diffusion occurring due to real fiber irregularity and micro- and macro-bends. We present some results of simulation 10GBase-LX optical signal transmission over 100-μm-core MMFs graded-index refractive index profile corresponding to the typical laser-optimized MMFs 50/125 of ISO/IEC Cat. OM2+/OM3 scaled up to 100 μm core.
关键词： higher- order modes,few-mode regime,on-board cable systems,mode coupling,laser-based multi-Gigabit data transmission,large core multimode optical fiber,industrial networks,differential mode delay
更新于2025-09-11 14:15:04
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Analysis and design of TEM-TE11 coaxial waveguide bend mode converters
摘要： Two coaxial waveguide bend mode converters that transform coaxial transverse electromagnetic mode to TE11 coaxial waveguide mode are presented in this paper. Both converters are designed and optimized on the basis of the strictly derived mode coupling coefficients. Conversion efficiencies of both converters are over 99% and the power-handling capacities reach a gigawatt level. The combined dual-bend mode converter is fabricated and tested. The experimental results coincide well with the theoretical calculations and simulations, which demonstrates the feasibility of the designed converter.
关键词： Mode converter,high-power microwave,waveguide bend,mode coupling
更新于2025-09-11 14:15:04
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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) - Random Mode Coupling Assists Kerr Beam Self-Cleaning in a Graded-Index Multimode Optical Fiber
摘要： Spatiotemporal light beam dynamics in multimode ?bers (MMF) recently has attracted renewed interest in both fundamental physics and various ?elds of practical application [1,2]. Recent experiments [2,3] have shown that, owing to the Kerr effect, a process of beam self-cleaning can be observed in graded-index (GRIN) MMFs. As a result, one observes a robust nonlinear beam, which has a size that is close to the fundamental mode at the ?ber output, in contrast to a speckled output beam, which is obtained in the case of the linear regime. In this paper, we numerically investigate the process of beam self-cleaning in GRIN MMFs. Unlike previous approaches [3], where the nonlinear propagation of a spatial beam along the multimode ?ber was described by the generalized 3D nonlinear Schrdinger equation, we use the coupled-mode model, which has the following form: 2i dAp,m dζ = D(n + 1)2Ap,m + p ∑ m+m1=m2+m3 ∑ p+p1=p2+p3 f m,m1,m2,m3 p,p1,p2,p3 Ap1,m1Ap2,m2Ap3,m3 + ∑ m1,p1 Cm,m1 p,p1 Ap1,m1 . These equations separately describe the evolution of the amplitude of each mode Ap,m. The coupled mode approach signi?cantly reduces the computation time, due to the use of a large integration step. To account for the various imperfections of the multimode ?ber, caused by fabrication, bending or tilting, we added a random linear coupling term to the equation. Fig. 1 Dynamics of energy distribution by modes and the output ?eld for the model without random linear coupling (a) and with random linear coupling between degenerate modes (b). In this contribution, we describe various models of random linear coupling between spatial modes, including coupling between all modes, or only between degenerate ones, and investigate the effects of random mode coupling on the beam self-cleaning process. Fig. 1a shows the spatial dynamics of energy distribution among the modes, corresponding to a model without any random linear coupling. In this case, in spite of being in a strong nonlinear regime, the power of the fundamental mode oscillates along the ?ber, and we still obtain a speckled beam at the ?ber output. On the other hand, if we consider a model with random linear coupling between spatial modes with equal mode numbers, one readily observes the appearance of a self-cleaning effect, and the fundamental mode power swiftly stabilizes upon the propagation (see Fig. 1b). The output beam in this case has a size that is close to that of the fundamental mode. The results of numerical investigations are in complete agreement with our experimental data.
关键词： Kerr effect,graded-index multimode optical fiber,beam self-cleaning,random mode coupling
更新于2025-09-11 14:15:04
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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) - Coupling Ideality Optimization of High-Q Deuterated Silicon Nitride Microresonator
摘要： As one of the important photonic integrated platforms, microcavity resonators based on silicon nitride (SiN) have great potential in nonlinear optics applications due to their low loss and high nonlinearity. They are usually designed with a multi-mode structure to achieve high quality factors (Q factors) and small mode volumes, which are beneficial for enhancing light-matter interactions. However, the multi-mode nature also introduces challenges in controlling the coupling between different modes, especially for high-order modes. In this work, we demonstrate a detailed coupling identification of high-Q SiN microresonators with a multi-mode structure. By carefully designing the coupling region between the bus waveguide and the microresonator, we achieve selective excitation of different modes and investigate their coupling characteristics. Our results show that the coupling strength can be effectively controlled by adjusting the gap size and the coupling length, which provides a useful guideline for optimizing the performance of SiN microresonators in nonlinear optics applications.
关键词： microresonator,quality factor,nonlinear optics,silicon nitride,mode coupling
更新于2025-09-11 14:15:04
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All-optical mode conversion and temperature sensing via transient-grating in step-index fiber
摘要： We demonstrate the formation of Kerr-induced transient long period grating in a standard single-mode ?ber (SMF28) using sub-nanosecond laser pulses and it’s application as an ef?cient all-optical mode conversion and temperature sensing. The ?ber supports LP01 and LP11 spatial modes at 1064 nm wavelength. The beating between two guided modes induces refractive index grating exploiting the Kerr effect. The probe beam co-propagating with the pump at the same wavelength but with different polarization, exhibits ef?cient mode conversion ef?ciency from LP01 to LP11 mode. Temperature sensitivity is measured owing to the change in mode conversion ef?ciency due to the shift in resonant peak wavelength with the increase in temperature. The change in temperature is manifested by the change in spectral power of probe beam at the output. Experimental result demonstrates an average temperature sensitivity of 0.15 Watt/oC. The transient nature of the grating with high sensitivity makes our approach unique from the existing results and can open a route for potential applications.
关键词： Fiber nonlinear optics,optical sensing,Fiber mode coupling
更新于2025-09-10 09:29:36
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Impact of Linear Mode Coupling on the Nonlinear Transmission Performance of Few-Mode Fibres
摘要： In this paper, we review the study of nonlinear transmission performance of few-mode fibre links operating for different linear mode coupling regimes and for different mode delay maps. We will describe how linear mode coupling and differential mode delay can be used to mitigate the overall nonlinear distortion and present optimum link configurations at practical levels of digital equalisation complexity.
关键词： linear mode coupling,differential mode delay,nonlinear analysis,few-mode fibres
更新于2025-09-04 15:30:14