Multimode Nonlinear Optical Fibers

A special issue of Fibers (ISSN 2079-6439).

Deadline for manuscript submissions: closed (30 November 2023) | Viewed by 3979

Special Issue Editors


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Guest Editor
Department of Information Engineering, Electronics and Telecommunications, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy
Interests: nonlinear optics; multimode fibers; glass materials

E-Mail Website
Guest Editor
Department of Information Engineering, Electronics and Telecommunications, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy
Interests: nonlinear optics; multimode fibers; electromagnetic scattering; metamaterials
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Department of Information Engineering, Electronics and Telecommunications, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy
Interests: nonlinear dynamics; soliton formation; applied bifurcation theory; pattern formation; spatiotemporal complex dynamics

Special Issue Information

Dear Colleagues,

As its name conceptualizes, a multimode fiber is an optical fiber which supports the simultaneous propagation of a multitude of guided modes. This is achieved by a large core area whose diameter may range from a few tens to several hundreds of microns. The degree of freedom enabled by the multimodality provides several advantages both for the investigation of fundamental effects, e.g., those that exploit the complex coupling among the multitude of modes, and for applications, e.g., in the field of space-division-multiplexed telecommunications.

Interest in multimode fibers has recently experienced exponential growth, mostly owing to their breakthrough potential for technologies based on nonlinear optical effects. For instance, in the field of high-power photonic devices, multimode fibers allow for the demonstration of high-power fiber lasers and their application in material micromachining. Moreover, nonlinear optics in multimode fibers permit, on the one hand, the enhancement of the resolution of biomedical imaging devices and, on the other hand, the generatation of supercontinuum light, which is a frontier topic in the field of optical sources.

As a matter of fact, at variance with their single mode counterpart, which only allows the propagation of one mode, in multimode fibers, the nonlinearity of the material merges with a complex multimodality, giving rise to a novel universe of phenomena, such as the generation of the so-called spatiotemporal solitons. For this reason, multimode fibers have been targeted as testbeds for the investigation of complex physical systems.

This Special Issue aims at attracting all researchers working in this research field and at collecting new findings and recent advances in the field of multimode nonlinear fiber optics, both fundamental-science- and application-oriented. In particular, we encourage the submission of manuscripts, either research or review works, related to the following areas:

  • Nonlinear effects in multimode fibers;
  • Nonlinear dynamics in multimode fibers;
  • Ultrafast phenomena in multimode fibers;
  • Multimode fiber lasers and amplifiers;
  • Multimode nonlinear fiber design and fabrication;
  • Multimode fiber supercontinuum sources;
  • Specialty multimode nonlinear optical fibers;
  • Mid-IR multimode fibers;
  • Multimode fibers applications;
  • Multimode solitons and light bullets.

Dr. Mario Ferraro
Dr. Fabio Mangini
Dr. Pedro Parra-Rivas
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fibers is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • multimode fibers
  • nonlinear optical fibers
  • nonlinear optics
  • optical fibers
  • optical solitons
  • multimode solitons
  • spatiotemporal solitons
  • spatiotemporal complexity
  • multimode complexity
  • light bullets

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Published Papers (2 papers)

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16 pages, 6134 KiB  
Article
Optimization and Dispersion Tailoring of Chalcogenide M-Type Fibers Using a Modified Genetic Algorithm
by Nikolay I. Salnikov, Alexey V. Andrianov and Elena A. Anashkina
Fibers 2023, 11(11), 89; https://doi.org/10.3390/fib11110089 - 24 Oct 2023
Viewed by 1433
Abstract
M-type optical fibers in which a core is surrounded by a thin ring layer with a higher refractive index have attracted increasing attention in recent years. One of their advantageous features is the ability to operate a non-fundamental LP02 mode possessing unusual [...] Read more.
M-type optical fibers in which a core is surrounded by a thin ring layer with a higher refractive index have attracted increasing attention in recent years. One of their advantageous features is the ability to operate a non-fundamental LP02 mode possessing unusual dispersion properties, namely, a zero-dispersion wavelength (ZDW) shifted to the short wavelength region relative to the material ZDW. The LP02 mode can be selectively excited since it is predominantly localized near the core, while the fundamental LP01 and other higher modes are localized near the ring (for proper fiber parameters). In this paper, we present a comprehensive theoretical analysis of effective dispersion tailoring for the HE12 mode of highly nonlinear chalcogenide glass fibers (for which the LP mode approximation fails due to large refractive index contrasts). We demonstrate fiber designs for which ZDWs can be shifted to the spectral region < 2 μm, which is of great interest for the development of mid-IR supercontinuum sources and frequency-tunable pulse sources with standard near-IR pumping. We obtained the characteristic equation and solved it numerically to find mode fields and dispersion characteristics. We show the possibility of achieving dispersion characteristics of the HE12 mode with one, two, three, and four ZDWs in the wavelength range of 1.5–5.5 μm. We used a modified genetic algorithm (MGA) to design fibers with desired dispersion parameters. In particular, by applying an MGA, we optimized four fiber parameters and constructed a fiber for which HE12 mode dispersion is anomalous in the 1.735–5.155 μm range. Full article
(This article belongs to the Special Issue Multimode Nonlinear Optical Fibers)
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10 pages, 2758 KiB  
Article
Multimode Graded Index Fiber with Random Array of Bragg Gratings and Its Raman Lasing Properties
by Alexey G. Kuznetsov, Alexey A. Wolf, Zhibzema E. Munkueva, Alexander V. Dostovalov and Sergey A. Babin
Fibers 2023, 11(6), 48; https://doi.org/10.3390/fib11060048 - 24 May 2023
Cited by 2 | Viewed by 1852
Abstract
Light propagation in multimode fibers is known to experience various nonlinear effects, which are being actively studied. One of the interesting effects is the brightness enhancement at the Raman conversion of the multimode beam in graded index (GRIN) fiber due to beam cleanup [...] Read more.
Light propagation in multimode fibers is known to experience various nonlinear effects, which are being actively studied. One of the interesting effects is the brightness enhancement at the Raman conversion of the multimode beam in graded index (GRIN) fiber due to beam cleanup at Raman amplification and mode selective feedback in the Raman laser cavity based on fiber Bragg gratings (FBGs) with special transverse structure. It is also possible to explore random distributed feedback based on Rayleigh backscattering on natural refractive index fluctuations in GRIN fibers, but it is rather weak, requiring very high power multimode pumping for random lasing. Here, we report on the first realization of femtosecond pulse-inscribed arrays of weak randomly spaced FBGs in GRIN fibers and study Raman lasing at its direct pumping by highly multimode (M2~34) 940-nm laser diodes. The fabricated 1D–3D FBG arrays are used as a complex output mirror, together with the highly reflective input FBG in 1-km fiber. Above threshold pump power (~100 W), random lasing of the Stokes beam at 976 nm is obtained with output power exceeding 28 W at 174 W pumping. The beam quality parameter varies for different arrays, reaching M2~2 at the linewidth narrowing to 0.1–0.2 nm due to the interference effects, with the best characteristics for the 2D array. Full article
(This article belongs to the Special Issue Multimode Nonlinear Optical Fibers)
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