Silver-halide segmented cladding fibers for the middle infrared

Millo, Arnon; Naeh, Itay; Lavi, Yaron; Katzir, Abraham

doi:10.1063/1.2213958

Cited by 23 publications

(6 citation statements)

References 13 publications

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“…As we can see from the summary, Fig. 6, intensity profile of FM shows that smaller MFR would anticipate higher nonlinear effects on incidence, whereas NA of an angularly segmented cladding can be defined by replacing n 2 with n eff [33], thus NA = n 2 1 − n 2 eff , and its plot as a function of wavelength is shown in Fig. 7.…”

Section: Mode Field Radius (Mfr) and Numerical Aperture (Na)mentioning

confidence: 99%

A Star-Wheel Design of Single Crystal Sapphire Optical Fiber Promoting Single Mode Operation in the Infrared Regime

Mumtaz¹,

Dai²,

Ashraf³

et al. 2021

PIER C

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In this study, a star-wheel design of single crystal sapphire optical fiber is proposed to achieve single mode operation in the infrared regime. In the azimuthal direction the structure retains a reduced core of higher refractive index. It is connected to the outer boundary via star-wheel configuration of segments. The region of alternating symmetrical truncated cavities of lower refractive index is air. The enclosed alternating layers of sapphire and air cavities around the reduced core function as cladding. Fiber structure in the azimuthal direction is uniformly distributed in the radial direction. Finite element method is employed to analyze the modal characteristics of fundamental and higher order modes. Under strongly guided approximation, the structure can effectively eliminate the large modal interference. The proposed waveguides, at operating wavelength of ∼ 1.55 µm, with the diameters of ∼ 50 µm, 75 µm, 100 µm, and 125 µm diameter, exhibit confinement loss of ∼ 0.0314 dB/m, 0.0072 dB/m, 0.0023 dB/m, and 0.0009 dB/m, respectively. It is anticipated that such a fiber can be a potential candidate in addressing a wide range of optical sensors and communication systems, which unable to sustain in extremely harsh environments. COMSOL multi-physics R is used to perform numerical investigations.

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Section: Mode Field Radius (Mfr) and Numerical Aperture (Na)mentioning

confidence: 99%

A Star-Wheel Design of Single Crystal Sapphire Optical Fiber Promoting Single Mode Operation in the Infrared Regime

Mumtaz¹,

Dai²,

Ashraf³

et al. 2021

PIER C

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“…[14][15][16][17][18] Under this circumstance, researches on the rare earth doped segmented-cladding polymer optical fibers (SCPOF) were started in our group based on our previous work on rare earth doped multi-mode POF. [19][20][21][22][23][24][25][26][27][28] In this work, a model for selection of suitable core and cladding polymers for SCPOF is proposed in terms of the physical principle and requirements for a preform of SCPOF.…”

Section: Introductionmentioning

confidence: 99%

“…A new design of fiber structure called segmented‐cladding fiber (SCF) gave another way to fabricate SMFs, which has a uniform core of a high refractive index and a cladding with alternating angularly regions of high and low refractive indices 12, 13. For it's unique structure, especially for the single‐moded operation realized in a large core diameter, application of SCF concept in POF has attracted much attention in recent years 14–18. Under this circumstance, researches on the rare earth doped segmented‐cladding polymer optical fibers (SCPOF) were started in our group based on our previous work on rare earth doped multi‐mode POF 19–28.…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of SCPOF preform doped with rare earth complexes

Luo

et al. 2008

J of Applied Polymer Sci

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Segmented-cladding fibers (SCF) consist of a uniform core of high refractive index and a cladding with regions of high and low refractive index alternating angularly, which can effectively realize single mode with a large core diameter. Because polymer optical fibers are usually of large diameter, theoretical model for SCF was further extended to segmented-cladding polymer optical fibers (SCPOF) doped with rare earth complex in this article. On the basis of the physical principle, a material model for SCPOF was established, from which refractive index and glass transition temperature of polymer materials was predetermined for the core and cladding of SCPOF, respectively. According to the model, a preform for SCPOF was fabricated with the core doped with Eu(DBM) 3 Phen that has characteristic emission at 613 nm under excitation at 365 nm. From results of fluorescence photograph, it is clearly seen that the expected preform has been obtained by a two-step method developed in this work.

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“…The structure of SCF, which contains alternate high-and low-index segments in the angular direction in the cladding, makes it difficult to fabricate it with conventional optical fiber fabrication technologies. 4 It is very difficult to fabricate the SCF in silica glass as it is a comparatively hard material and not easy to shape into segments of the desired geometry. [4][5][6][7] Yeung et al experimentally demonstrated fabrication of polymer SCF and used two methods to fabricate the fiber.…”

Section: Introductionmentioning

confidence: 99%

Segmented cladding fiber fabricated in silica-based glass

et al. 2015

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We report fabrication of a segmented cladding fiber (SCF) in silica-based glass. An SCF with a uniform core of pure silica and cladding of periodically arranged pure silica and fluorine-doped silica in an angular direction has been fabricated by using the stack-and-draw technique. The fabricated fiber has been characterized by capturing its near-field intensity pattern at 633 nm wavelength. The number of modes has been estimated from the captured near-field intensity pattern by using neural network analysis. A four-segment SCF of 30-μm core diameter and 0.43% relative index differences between the high-and low-index segments shows few-mode operation by filtering out higher-order modes of an otherwise highly multimode fiber.

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Silver-halide segmented cladding fibers for the middle infrared

Cited by 23 publications

References 13 publications

A Star-Wheel Design of Single Crystal Sapphire Optical Fiber Promoting Single Mode Operation in the Infrared Regime

A Star-Wheel Design of Single Crystal Sapphire Optical Fiber Promoting Single Mode Operation in the Infrared Regime

Design and fabrication of SCPOF preform doped with rare earth complexes

Segmented cladding fiber fabricated in silica-based glass

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