Nonlinear beam self-cleaning in a coupled cavity composite laser based on multimode fiber

Guenard, R.; Krupa, Katarzyna; Dupiol, R.; Fabert, Marc; Bendahmane, Abdelkrim; Kermène, Vincent; Desfarges‐Berthelemot, Agnès; Auguste, Jean‐Louis; Tonello, Alessandro; Barthélémy, Alain; Millot, Guy; Wabnitz, Stefan; Couderc, Vincent

doi:10.1364/oe.25.022219

Cited by 50 publications

(25 citation statements)

References 21 publications

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“…An interesting subject to explore in the future is whether DNNs recognize inputs when the intensity of the light source is increased to the point where nonlinear effects significantly impact the output intensity patterns. A related question is whether neural network controllers [29] can be used to control nonlinear light propagation in MMF's [30,31].…”

Section: Resultsmentioning

confidence: 99%

Learning to see through multimode fibers

Borhani¹,

Kakkava²,

Moser³

et al. 2018

Optica

351

188

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We use Deep Neural Networks (DNNs) to classify and reconstruct a large database of handwritten digits from the intensity of the speckle patterns that result after the images propagated through multimode fibers (MMF). Images transmitted through fibers with up to 1km length were recovered. The ability of the network to recognize the input degraded with fiber length but the performance could be enhanced if the neural networks were trained to first reconstruct the image and then classify it rather than classify it directly from the speckle intensity.

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Section: Resultsmentioning

confidence: 99%

Learning to see through multimode fibers

Borhani¹,

Kakkava²,

Moser³

et al. 2018

Optica

351

188

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“…These findings are of great importance for the design of high power fiber amplifiers [15] and mode-locked lasers [16,17] based on MMFs, and their technological applications. The experimentally observed spatial beam reshaping into a quasi-fundamental mode of the nonlinear multimode fiber, accompanied by temporal pulse compression, is analogous to the discrete spatiotemporal focusing and compression, which occurs with pulses propagating in multicore optical fibers [18][19][20].…”

Section: Introductionmentioning

confidence: 81%

Spatiotemporal light-beam compression from nonlinear mode coupling

et al. 2018

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We experimentally demonstrate simultaneous spatial and temporal compression in the propagation of light pulses in multimode nonlinear optical fibers. We reveal that the spatial beam self-cleaning recently discovered in graded-index multimode fibers is accompanied by significant temporal reshaping and up to four-fold shortening of the injected sub-nanosecond laser pulses. Since the nonlinear coupling among the modes strongly depends on the instantaneous power, we explore the entire range of the nonlinear dynamics with a single optical pulse, where the optical power is continuously varied across the pulse profile.

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“…In particular, graded-index multimode fibers (GRIN MMFs), thanks to their reduced modal dispersion which permits relatively long interaction lengths among the guided modes, were found to host a rich variety of spatiotemporal dynamical effects [1][2][3]. Among these, we may cite multimode solitons [4], ultra-wideband spectral sideband series generation from either oscillating multimode solitons [1,5] or quasi continuous-wave (CW) pulses (also known as geometric parametric instability, GPI) [6][7][8][9], intermodal four-wave mixing (IMFWM) [10,11], beam self-cleaning in passive [7,8,12,13] and active MMFs [14], supercontinuum generation [15,16], spatio-temporal mode-locking [17,18], and wavefront shaping control of frequency conversion processes [19], to name a few.…”

Section: Introductionmentioning

confidence: 99%

Refractive index profile tailoring of multimode optical fibers for the spatial and spectral shaping of parametric sidebands

Krupa¹,

Couderc²,

Tonello³

et al. 2019

J. Opt. Soc. Am. B

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We introduce the concept of spatial and spectral control of nonlinear parametric sidebands in multimode optical fibers by tailoring their linear refractive index profile. In all cases, the pump experiences Kerr self-cleaning, leading to a bell-shaped profile close to the fundamental mode. Geometric parametric instability, owing to quasi-phase-matching from the grating generated via the Kerr effect by pump self-imaging, leads to frequency multicasting of beam self-cleaning across a wideband array of sidebands. Our experiments show that introducing a gaussian dip in the refractive index profile of a graded index fiber permits to dramatically change the spatial content of spectral sidebands into higher-order modes. This is due to the breaking of oscillation synchronism among fundamental and higher-order modes. Hence modal-four-wave mixing prevails over geometric parametric instability as the main sideband generation mechanism. Observations agree well with theoretical predictions based on a perturbative analysis, and with full numerical solutions of the (3D + 1) nonlinear Schrödinger equation.

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Nonlinear beam self-cleaning in a coupled cavity composite laser based on multimode fiber

Cited by 50 publications

References 21 publications

Learning to see through multimode fibers

Learning to see through multimode fibers

Spatiotemporal light-beam compression from nonlinear mode coupling

Refractive index profile tailoring of multimode optical fibers for the spatial and spectral shaping of parametric sidebands

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