The Experts below are selected from a list of 91152 Experts worldwide ranked by ideXlab platform
Demetrios N Christodoulides - One of the best experts on this subject based on the ideXlab platform.
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Entropic thermodynamics of nonlinear photonic chain networks
Communications Physics, 2020Co-Authors: Pawel S. Jung, Midya Parto, Mercedeh Khajavikhan, Demetrios N ChristodoulidesAbstract:The convoluted nonlinear behaviors of heavily Multimode photonic structures have been recently the focus of considerable attention. The sheer complexity associated with such Multimode systems, allows them to display a host of phenomena that are otherwise impossible in few-mode settings. At the same time, however, it introduces a set of fundamental challenges in terms of comprehending and harnessing their response. Here, we develop an optical thermodynamic approach capable of describing the thermalization dynamics in large scale nonlinear photonic tight-binding networks. For this specific system, an optical Sackur-Tetrode equation is obtained that explicitly provides the optical temperature and chemical potential of the photon gas. Processes like isentropic expansion/compression, Joule expansion, as well as aspects associated with beam cleaning/cooling and thermal conduction effects in such chain networks are discussed. Our results can be used to describe in an effortless manner the exceedingly complex dynamics of highly Multimoded nonlinear bosonic systems. Theoretical descriptions of photonic networks become increasingly complex as nonlinear, Multimode systems are considered. Here, a statistical approach to determining the optical entropy of complex photonic chain networks is presented.
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accelerated nonlinear interactions in graded index Multimode fibers
Nature Communications, 2019Co-Authors: M. A. Eftekhar, Frank W Wise, Sepehr Benis, Miroslav Kolesik, Z Sanjabieznaveh, Helena Lopezaviles, J E Antoniolopez, Rodrigo Amezcuacorrea, Demetrios N ChristodoulidesAbstract:Multimode optical fibers have recently reemerged as a viable platform for addressing a number of long-standing issues associated with information bandwidth requirements and power-handling capabilities. As shown in recent studies, the complex nature of such heavily Multimoded systems can be effectively exploited to observe altogether novel physical effects arising from spatiotemporal and intermodal linear and nonlinear processes. Here, we study for the first time, accelerated nonlinear intermodal interactions in core-diameter decreasing Multimode fibers. We demonstrate that in the anomalous dispersion region, this spatiotemporal acceleration can lead to relatively blue-shifted Multimode solitons and blue-drifting dispersive wave combs, while in the normal domain, to a notably flat and uniform supercontinuum, extending over 2.5 octaves. Our results pave the way towards a deeper understanding of the physics and complexity of nonlinear, heavily Multimoded optical systems, and could lead to highly tunable optical sources with very high spectral densities. Multimode optical fibers can be used to observe complex intermodal processes like optical solitons. Here, Eftekhar et al. study accelerated nonlinear interaction in Multimode fibers with a tapered core diameter and its effect on the temporal and spectral behavior of the Multimode solitons.
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Accelerated nonlinear interactions in graded-index Multimode fibers
Nature Publishing Group, 2019Co-Authors: M. A. Eftekhar, Helena Lopez-aviles, Z. Sanjabi-eznaveh, Jose Enrique Antonio-lopez, Sepehr Benis, Miroslav Kolesik, F. Wise, R. Amezcua-correa, Demetrios N ChristodoulidesAbstract:Multimode optical fibers can be used to observe complex intermodal processes like optical solitons. Here, Eftekhar et al. study accelerated nonlinear interaction in Multimode fibers with a tapered core diameter and its effect on the temporal and spectral behavior of the Multimode solitons
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Multimode PT-symmetric optical structures
Conference on Lasers and Electro-Optics 2012, 2012Co-Authors: Konstantinos G. Makris, Ramy El-ganainy, Demetrios N ChristodoulidesAbstract:We examine the unusual properties of Multimoded PT-symmetric optical potentials. Multiple PT-thresholds, complex bifurcation mode organization, vortices in the transverse power flow, and phase singularities, are few of the exotic characteristics of Multimode PT-Optics.
Ray Sollie - One of the best experts on this subject based on the ideXlab platform.
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Generalized Multimode squeezed states
Physical Review A, 1993Co-Authors: C.f. Lo, Ray SollieAbstract:The notion of squeezing is generalized to the case of Multimodes. The Multimode generalized squeezing operator has similar algebraic properties to those of the single-mode case and reduces to the usual two-mode squeezing operator in the case of two modes. It is also shown that the generalized Multimode squeezed state is a Multimode minimum-uncertainty state if the squeezing parameters are real
Nasser N Peyghambarian - One of the best experts on this subject based on the ideXlab platform.
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Coherent beam transformations using Multimode waveguides
Optics Express, 2010Co-Authors: Xiushan Zhu, Jerome V Moloney, Axel Schülzgen, H Li, Hua Wei, Nasser N PeyghambarianAbstract:Physical insights and characteristics of beam transformations based on Multimode interference (MMI) in Multimode waveguides are illuminated and analyzed. Our calculations show that, utilizing a short piece of cylindrical Multimode waveguide, an input Gaussian beam can be readily transformed to frequently desired beams including top-hat, donut-shaped, taper-shaped, and Bessel-like beams in the Fresnel or the Fraunhofer diffraction range, or even in both ranges. This is a consequence of diffractive propagation of the field exiting the waveguide. The performance of the beam shaper based on MMI can be controlled via tailoring the dimensions of the Multimode waveguide or changing the signal wavelength. This beam shaping technique is investigated experimentally using monolithic fiber devices consisting of a short piece of Multimode fiber (~ 10 mm long) and a single-mode signal delivery fiber.
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generation of controllable nondiffracting beams using Multimode optical fibers
Applied Physics Letters, 2009Co-Authors: Xiushan Zhu, Axel Schülzgen, Nasser N PeyghambarianAbstract:A method of generating nondiffracting beams using Multimode optical fibers is reported. When a large-core Multimode fiber is spliced onto a piece of single-mode fiber, only linearly polarized (LP0,n) modes are excited inside the Multimode fiber segment because of mode orthogonality and on-axis excitation. Since the excited LP0,n modes are actually Bessel fields with different transverse wave vectors truncated by the core of the Multimode fiber, the beam exiting the Multimode fiber facet can form a variety of readily controllable and nearly nondiffracting optical patterns resulting from interference of apertured Bessel fields.
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detailed investigation of self imaging in largecore Multimode optical fibers for application in fiber lasers and amplifiers
Optics Express, 2008Co-Authors: Axel Schülzgen, Jerome V Moloney, H Li, L Li, Nasser N PeyghambarianAbstract:Properties of the self-imaging effect based on Multimode interference (MMI) in large-core passive optical fibers are investigated and analyzed in detail, with the purpose of using Multimode active fibers for high power single-transverse-mode emission. Although perfect self-imaging of the input field from a standard single-mode fiber (SMF-28) in a Multimode fiber becomes practically impossible as its core diameter is larger than 50 µm, a quasi-reproduction of the input field occurs when the phase difference between the excited modes and the peak mode inside the Multimode fiber is very small. Our simulation and experimental results indicate that, if the length of the Multimode fiber segment can be controlled accurately, reproduction of the input field with a self-imaging quality factor larger than 0.9 can be obtained. In this case, a low-loss hybrid fiber cavity composed of a SMF-28 segment and a very-large-core active Multimode fiber segment can be built. It is also found that for the hybrid fiber cavity, increasing the mode-field diameter of the single-mode fiber improves both the self-imaging quality and the tolerance on the required length accuracy of the Multimode fiber segment. Moreover, in this paper key parameters for the design of MMI-based fiber devices are defined and their corresponding values are provided for Multimode fibers with core diameters of 50 µm and 105 µm.
Wan Hui-jun - One of the best experts on this subject based on the ideXlab platform.
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Equal-power 2(2m+1)-th power Y-squeezing of generalized magnetic-field component in new kind of Multimode quantum light field state ｜Ψ~(3)〉_q
Journal of Shaanxi Normal University, 2004Co-Authors: Wan Hui-junAbstract:By utilizing the theory of Multimode squeezed states established recently, the generalized nonlinear even number power equal-power N-th power Y-squeezing effects of generalized magnetic-field component in the new kind of Multimode quantum light-field state (｜Ψ~((3))〉_q) is studied firstly in detail, which is composed of the linear superposition of macroscopically distinct three quantum states named Multimode complex conjugation imaginary coherent state, the contrary state of Multimode complex conjugation imaginary coherent state and Multimode complex conjugation coherent state. It is found that under certain and fixed conditions, the generalized magnetic-field component in the state ｜Ψ~((3))〉_q can always display the effects of even number power generalized nonlinear equal-power N-th power Y-squeezing.
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Effect of Generalized Nonlinear Unequal-Power Higher-Power Sum Squeezing of Generalized Electric-Field Component in│Ψ~(3)>_q
Journal of University of Science and Technology of Suzhou, 2003Co-Authors: Wan Hui-junAbstract:According to the linear superposition principle of state in quantum mechanics,the three state superposi-tion Multimode Schr dinger-Cat State light-field,namely,Multimode SCS light-field) │ Ψ ,3) q is constructed,which is composed of Multimode complex conjugation imaginary coherent state,the contrary state of Multimode complex conjugation imaginary coherent state,and Multimode complex conjugation coherent state.The Multimode squeezed state theory established recently by pro fessor Yang Zhiyong and academician Hou Xun is utilized to study the char-acteristics of generalized nonlinear unequal-power higher-power sum squeezing of the generalized electric-field com-ponent in the Multimode SCS light-field │ Ψ ,3) q mentioned above in detail.The results show that under the condi-tion of the sum of squeezing-power-number for every mode being an even number,while some other fixed conditions are respectively satisfied by the sum of the products between the squeezing-power-number of each mode and the ini-tial phase which is in accordance with each mode above,by the interstate initial phase difference,and by the mean photon-number of each Multimode coherent state light-field,the generalized electric-field component of the multi-mode SCS light-field │ Ψ ,3) q can always display the effects of any N j -th power generalized nonlinear unequal-power higher-power sum squeezing that change periodically and alternatively.
Wei Xia - One of the best experts on this subject based on the ideXlab platform.
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All-fiber passively mode-locked laser using nonlinear Multimode interference of step-index Multimode fiber
Photonics Research, 2018Co-Authors: Tao Chen, Haikun Zhang, Qiaoli Zhang, Xin Li, Yaping Zhang, Wei XiaAbstract:We experimentally demonstrate for the first time, to the best of our knowledge, an all-fiber passively mode-locked laser operation based on the nonlinear Multimode interference of step-index Multimode fiber. Such a structure couples the light in and out of the Multimode fiber via single-mode fibers, and its physical mechanisms for saturable absorption have been analyzed theoretically based on the third-order nonlinear Kerr effect of Multimode fiber. Using the nonlinear Multimode interference structure with 48.8 mm length step-index Multimode fiber, the modulation depth has been measured to be ∼5%. The passively mode-locked laser output pulses have a central wavelength of 1596.66 nm, bandwidth of 2.18 nm, pulsewidth of ∼625 fs, and fundamental repetition rate of 8.726 MHz. Furthermore, the influence of total cavity dispersion on the optical spectrum, pulse width, and output power is investigated systematically by adding different lengths of single-mode fiber and dispersion compensation fiber in the laser cavity.
