Experimental and Theoretical Study of Light Propagation in Suspended-Core Optical Fiber

Grabka, Michał; Wajnchold, Barbara; Pustelny, Szymon; Gawlik, Wojciech; Skorupski, Krzysztof; Mergo, Paweł

doi:10.12693/aphyspola.118.1127

Cited by 18 publications

(13 citation statements)

References 14 publications

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“…The high NA of the fibres allowed them to guide multiple modes with around 20 guided modes at 4.5μm for the D c =10μm and NA=1.0 fiber, which had a V-number around 7, so some of the pump power could be lost to higher order modes. However, proper incoupling can ensure excitation of the FM only, which would be responsible for the majority of the broadening [49][50][51]. Since the fibres considered were not polarisation maintaining, during propagation the power would be distributed between the two polarisations of FM due to Cross-Phase Modulation (XPM) [53], which would effectively reduce the available peak power by a factor of two thereby limiting the potential broadening.…”

Section: Small Core and Large Nonlinearity Fibre For Mid-infrared Supmentioning

confidence: 99%

Mid-infrared supercontinuum generation to 125μm in large NA chalcogenide step-index fibres pumped at 45μm

Kubat¹,

Agger²,

Møller³

et al. 2014

Opt. Express

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Abstract:We present numerical modeling of mid-infrared (MIR) supercontinuum generation (SCG) in dispersion-optimized chalcogenide (CHALC) step-index fibres (SIFs) with exceptionally high numerical aperture (NA) around one, pumped with mode-locked praseodymium-doped (Pr 3+ ) chalcogenide fibre lasers. The 4.5um laser is assumed to have a repetition rate of 4MHz with 50ps long pulses having a peak power of 4.7kW. A thorough fibre design optimisation was conducted using measured material dispersion (As-Se/Ge-As-Se) and measured fibre loss obtained in fabricated fibre of the same materials. The loss was below 2.5dB/m in the 3.3-9.4μm region. Fibres with 8 and 10μm core diameters generated an SC out to 12.5 and 10.7μm in less than 2m of fibre when pumped with 0.75 and 1kW, respectively. Larger core fibres with 20μm core diameters for potential higher power handling generated an SC out to 10.6μm for the highest NA considered but required pumping at 4.7kW as well as up to 3m of fibre to compensate for the lower nonlinearities. The amount of power converted into the 8-10μm band was 7.5 and 8.8mW for the 8 and 10μm fibres, respectively. For the 20μm core fibres up to 46mW was converted. References and links1. S. Dupont, C. Petersen, J. Thøgersen, C. Agger, O. Bang, and S. R. Keiding, "IR microscopy utilizing intense supercontinuum light source," Opt. Express 20, 4887-4892 (2012 picosecond pulsed, normal dispersion pumping for generating efficient broadband infrared supercontinuum in meter-length single-mode tellurite holey fiber with high Raman gain coefficient," J.

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Section: Small Core and Large Nonlinearity Fibre For Mid-infrared Supmentioning

confidence: 99%

Mid-infrared supercontinuum generation to 125μm in large NA chalcogenide step-index fibres pumped at 45μm

Kubat¹,

Agger²,

Møller³

et al. 2014

Opt. Express

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“…After the fiber, the light was projected onto the CCD beam profiler (for more information on investigating the beam profile and its diffraction pattern evolution see Ref. [14]). Figure 3(a) presents a measured profile of light departing the fiber.…”

Section: Optical Properties Of All-solid Microstructured Optical Fibersmentioning

confidence: 99%

Optical properties of all-solid microstructured optical fibers

Uminska¹,

Grabka²,

Pustelny³

et al. 2012

Photon. Lett. Poland

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Abstract-In this Letter, we study optical properties of all-solid microstructured optical fiber made of soft glass. Such fibers have various interesting features including good geometrical stability, low fundamental transmission losses, high Kerr nonlinearity, and large solubility of rare-earth ions. By investigating the transmission mechanism, mode structure, and numerical aperture of the fibers and confronting the results with theoretical calculations we demonstrate that the fibers have optical properties similar to those observed in air-silica microstructured optical fibers. This makes the all-solid soft-glass microstructured fibers very attractive for many potential applications. [10]. While sophisticated structures of MOFs are responsible for unique properties of the fibers, they also make them very sensitive to any fluctuations of waveguide geometry. In fact, one of the major challenges of MOFs is the preservation of optical properties of the fibers along their length. This becomes particularly challenging for air-glass MOFs, as the capillaries of the fiber preform tend to collapse during fiber drawing [11]. In order to prevent such a collapse, pressure is applied during fiber fabrication. Although this technique limits sizable capillary contraction, it does not fully eliminate fluctuations in the fiber geometry, in particular, distortions of air-glass interface, which often introduce light-power losses and alter dispersion of the waveguide [11].The problem of the instability of optical properties of MOFs may be relaxed by fabrication of all-solid (AS) MOFs [11]. In that case, the geometry deviations are reduced by the application of two or more types of glass with properly matched thermal and chemical properties. A significant difference between refractive indices of glass may provide a sufficient contrast between the core and cladding allowing for the total-internal-reflection (index) guidance or the photonic-bandgap light guidance.In this Letter, we investigate optical properties of the AS MOF made of two types of soft glass (F2 and NC-21) with the respective refractive indices n F2 =1.619 and n NC =1.533, similar to those investigated in [12]. The fiber possesses hexagonal structure with the lattice constant Λ ≈ 2.5µm and d/Λ ≈ 0.65, where d is the diameter of the F2-glass rods (Fig. 1). Its core was formed by replacing seven central F2 rods with a single NC-21 rod and was surrounded by eight rings of the F2 rods constituting a microstructured cladding of the fiber [ Fig. 1(a)]. The fiber has an attenuation of ~13.1dB/m at 855nm [12]. All measurements presented in this paper were performed with a fiber of 18cm in length. (c) Scheme of the experimental setup. Depending on the investigated property, we used a diode laser operating at 795nm (the transverse mode profile and the numerical aperture measurements) or a supercontinuum source (the photonic-bandgap determination). The light was delivered to the investigated MOF trough a polarization-maintaining PANDA fiber. Detector denotes one of three types of...

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“…Since the light is a linear combination of the fiber transverse modes with amplitudes depending on the coupling conditions, length and imperfections of the fiber, a proper description of the diffraction requires knowledge of the transverse mode excited in the fiber. Figure 3 presents the simulations of such first six modes that most significantly contribute to the observed power profiles of the light [27]. It was shown in [27] that the most efficient coupling of the light into the fiber is obtained when the light beam is focused exactly on the center of the fiber core.…”

Section: Evolution Of the Diffraction Pattern During The Transition Fmentioning

confidence: 99%

“…Figure 3 presents the simulations of such first six modes that most significantly contribute to the observed power profiles of the light [27]. It was shown in [27] that the most efficient coupling of the light into the fiber is obtained when the light beam is focused exactly on the center of the fiber core. It allows one to couple more than 90% of the light (characterize with the Gaussian profile) into the first two (fundamental) modes.…”

Section: Evolution Of the Diffraction Pattern During The Transition Fmentioning

confidence: 99%

“…However, in order to do so, one needs to find a real power profile of the diffracting light at the fiber end, i.e., evaluate complex amplitudes 3 characterizing contributions of all modes forming the resultant mode. As shown in [27], determination of the light coupled into a specific mode is possible based on the knowledge of the spatial distribution of coupling light its incidence angle, polarization and relative position to the fiber core center.…”

Section: Evolution Of the Diffraction Pattern During The Transition Fmentioning

confidence: 99%

See 1 more Smart Citation

Evolution of the diffraction pattern during the transition from the near-field toward the far-field region

Grabka¹,

Pustelny²,

Wajnchold³

et al. 2011

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. In the paper we experimentally and theoretically analyze diffraction of light propagating through a microstructured optical fiber on the fiber end face. In the measurements the diffracting light is spatially inhomogeneous and the diffracting object is a solid-state core with a triangular shape. Application of optical system enables detailed experimental investigations of evolution diffraction pattern in the near-field region, in particular, rotation of the observed structure while departing from the fiber end. The experimental results are confirmed with theoretical simulations based on the theory of the Fresnel diffraction.

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Experimental and Theoretical Study of Light Propagation in Suspended-Core Optical Fiber

Cited by 18 publications

References 14 publications

Mid-infrared supercontinuum generation to 125μm in large NA chalcogenide step-index fibres pumped at 45μm

Mid-infrared supercontinuum generation to 125μm in large NA chalcogenide step-index fibres pumped at 45μm

Optical properties of all-solid microstructured optical fibers

Evolution of the diffraction pattern during the transition from the near-field toward the far-field region

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