Crystallization and Optical Loss Studies of Dy3+ -Doped, Low Ga Content, Selenide Chalcogenide Bulk Glasses and Optical Fibers

AbstractThe nature of nanocrystalline inclusions and dopant distribution in bismuth-doped silicate fibers and preforms are studied by scanning and transmission electron microscopy, and energy and wavelength-dispersive X-ray microanalysis. The core compositions are Bi:SiO2, Bi:Al2O3–SiO2, Bi:GeO2–SiO2, Bi:Al2O3–GeO2–SiO2, and Bi:P2O5–Al2O3–GeO2–SiO2. Nanocrystals of metallic Bi, Bi2O3, SiO2, GeO2, and Bi4(GeO4)3 are observed in these glasses. These inclusions can be the reason for the background optical loss in bismuth-doped optical fibers. The bismuth concentration of 0.0048±0.0006 at% is directly measured in aluminosilicate optical fibers with effective laser generation (slope efficiency of 27% at room temperature).

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Bending-induced optical loss in random-hole optical fibers

Optics Letters ◽

10.1364/ol.33.001443 ◽

2008 ◽

Vol 33 (13) ◽

pp. 1443 ◽

Cited By ~ 4

Author(s):

Gary Pickrell ◽

Cheng Ma ◽

Anbo Wang

Keyword(s):

Optical Fibers ◽

Optical Loss

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Crystalline selenium core optical fibers with low optical loss

Optical Materials Express ◽

10.1364/ome.7.001804 ◽

2017 ◽

Vol 7 (6) ◽

pp. 1804 ◽

Cited By ~ 9

Author(s):

Shuai Peng ◽

Guowu Tang ◽

Kaimin Huang ◽

Qi Qian ◽

Dongdan Chen ◽

...

Keyword(s):

Optical Fibers ◽

Optical Loss

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Optical loss of metal coated optical fibers at temperatures up to 800°C

Optical Memory and Neural Networks ◽

10.3103/s1060992x12010080 ◽

2012 ◽

Vol 21 (1) ◽

pp. 45-51 ◽

Cited By ~ 8

Author(s):

S. M. Popov ◽

V. V. Voloshin ◽

I. L. Vorobyov ◽

G. A. Ivanov ◽

A. O. Kolosovskii ◽

...

Keyword(s):

Optical Fibers ◽

Optical Loss

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Dependence of optical attenuation on radiation wavelength and waveguide geometry in copper-coated optical fibers

EPJ Web of Conferences ◽

10.1051/epjconf/202023811013 ◽

2020 ◽

Vol 238 ◽

pp. 11013

Author(s):

Pavel Cherpak ◽

Renat Shaidullin ◽

Oleg Ryabushkin

Keyword(s):

Optical Fibers ◽

Near Infrared ◽

Optical Loss ◽

Single Mode ◽

Optical Losses ◽

Radiation Losses ◽

Optical Attenuation ◽

Novel Approach ◽

Laser Sources

We demonstrate a novel approach to the determination of optical loss coefficients in metal-coated fibers in a 0.4-1.9 μm wavelength range. It is based on measuring the change of temperature-dependent electrical resistance of the metal coating caused by laser radiation transmitted through the fiber. A number of single-mode and multimode metallized fibers were investigated using several laser sources operating in visible and near infrared ranges. The spectral dependencies of optical losses of copper-coated fibers were experimentally obtained. The region that corresponds to the minimum optical losses is located near 1 μm wavelength. The increase of radiation losses in 1.5-1.9 μm region is much steeper compared to polymer-coated fibers.

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Акустооптические модуляторы с расширенной частотной полосой для волоконно-оптических линий

Журнал технической физики ◽

10.21883/jtf.2021.06.50874.330-20 ◽

2021 ◽

Vol 91 (6) ◽

pp. 1021

Author(s):

В.М. Епихин ◽

А.В. Рябинин

Keyword(s):

Optical Fibers ◽

Frequency Band ◽

Switching Time ◽

Optical Loss ◽

Single Mode ◽

Operating Mode ◽

Center Frequency ◽

Frequency Shifter ◽

Focused Beam ◽

Good Agreement

A modulator-frequency shifter with single-mode optical fibers for a radiation wavelength of 1064 nm has been developed and manufactured. The light beam was focused in the center of the sound column. Modulator switching time ≃ 18 ns. Operating mode: pulse, continuous. Total optical loss at center frequency: -3.2 dB. An expression for the frequency band of reception of the modulator is obtained. The estimates are in good agreement with the experimental data ≃ 40 MHz. It is shown that the use of a scheme with a focused beam makes it possible to implement a modulator with a minimum switching time ≃ (2-3) ns and a receiving frequency band ≃ (200-300) MHz.

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Electron Paramagnetic Resonance and Optical Study of Radiation-Induced Defect Centers in Doped Silica Glasses

MRS Proceedings ◽

10.1557/proc-61-197 ◽

1985 ◽

Vol 61 ◽

Cited By ~ 5

Author(s):

Robert N. Schwartz ◽

Gregory L. Tangonan ◽

G. Richard Blair ◽

Walee Chamulitrat ◽

Larry Kevan

Keyword(s):

Electron Paramagnetic Resonance ◽

Radiation Dose ◽

Optical Fibers ◽

Optical Loss ◽

Complex Spectrum ◽

Epr Spectrum ◽

Paramagnetic Resonance ◽

Silica Glasses ◽

Defect Centers ◽

Electron Paramagnetic

ABSTRACTGamma- and UV-induced defect centers in germanium and fluorine doped silica have been studied by electron paramagnetic resonance (EPR) spectroscopy. The complex spectrum at g≃2 in γ-irradiated germanium doped glass corresponds to a superposition of resonances from several germanium E′-centers. In UV-irradiated samples, however, the EPR spectrum is dominated by only one type of germanium E′-centers. Significant spectral simplification of γ-irradiated germanium doped silica can be achieved by heating or broadband photoirradiation. Similar results are observed in multimode germanium doped core optical fibers. UV-induced optical loss spectra in the 0.5–1.5 μm wavelength range were also measured in these core fibers as well as the growth kinetics of the UL-induced absorption. Gamma-irradiation of fluorine doped silica generated two different types of silicon E′-centers, Ea1. At lower radiation dose one sees a mixture of Ea1 and Ea2, but at higher radiation dose Ea2 dominates. A spectrum dominated by the Ea2 variant is also observed in LW-irradiated samples and in photobleached low gamma dose samples.

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Effect of Below-Freezing Temperature on Optical Loss of Polyimide-Coated Optical Fibers

Bulletin of the Lebedev Physics Institute ◽

10.3103/s1068335619090021 ◽

2019 ◽

Vol 46 (9) ◽

pp. 276-278

Author(s):

M. I. Bulatov ◽

I. S. Azanova ◽

A. F. Kosolapov ◽

A. N. Smirnova ◽

I. D. Saranova

Keyword(s):

Optical Fibers ◽

Optical Loss ◽

Freezing Temperature

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Large Faraday effect and structural properties of heavily Tb3+-doped borogermanate glasses: a potential precursor of magneto-optical fibers

10.21203/rs.3.rs-235342/v1 ◽

2021 ◽

Author(s):

Douglas Franco ◽

Yannick Ledemi ◽

Wagner Correr ◽

Steeve Morency ◽

Conrado Afonso ◽

...

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Faraday Effect ◽

Morphological Analysis ◽

Optical Loss ◽

Homogeneous Distribution ◽

Excellent Thermal Stability ◽

High Concentrations ◽

Potential Precursor ◽

Glass Compositions

Abstract New glass compositions containing high concentrations of Tb3+ ions were developed aiming at the production of magneto-optical (MO) fibers. This work reports on the structural and MO properties of a new glass composition based on (100-x)(41GeO2-25B2O3-4Al2O3-10Na2O-20BaO) – xTb4O7. Morphological analysis (HR-TEM) of the sample with the highest concentration of Tb3+ ions confirmed the homogeneous distribution of Tb3+ ions and the absence of nanoclusters. All the samples presented excellent thermal stability against crystallization (ΔT > 100 oC). An optical fiber was manufactured by a fiber drawing process. The UV-Vis spectra of the glasses showed Tb3+ electronic transitions and optical windows varying from 0.4 to 1.6 µm. The magneto-optical properties and the paramagnetic behaviors of the glasses were investigated using Faraday rotation experiments. The Verdet constant (VB) values were calculated at 500, 650, 880, 1050, 1330, and 1550 nm. The maximum VB values obtained at 650 and 1550 nm for the glass with x = 18 mol% were − 128 and − 17.6 rad T− 1 m− 1, respectively. The VB values at 500 and 1550 nm for the optical fiber containing 8 mol% of Tb4O7 were − 110.2 and − 9.5 rad T− 1 m− 1, respectively, while the optical loss at around 880 nm was 6.4 dB m− 1.

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Bend loss fiber optics design based on sinusoidal and ellipse configurations

Optica Applicata ◽

10.37190/oa210301 ◽

2021 ◽

Vol 51 (3) ◽

Author(s):

Noor Azie Azura Mohd Arif ◽

Dilla Durhya Burhanuddin ◽

Sahbudin Shaari ◽

Abang Annuar Ehsan

Keyword(s):

Fiber Optics ◽

Optical Fibers ◽

Optical Loss ◽

Single Mode ◽

Fiber Optic Sensor ◽

Curvature Radius ◽

Sensor Applications ◽

Bending Loss ◽

Bending Radius ◽

Bending Sensor

Bending losses in optical fibers comprise one of the extrinsic attenuations that contribute to optical loss and they are essential for optical fiber bending sensor applications. This work investigated the optical loss in a standard single-mode step-index fiber optics due to fiber bending at 1550 nm wavelength. Variations in macro-bending loss with curvature radius and turn number have been measured. Curvature radius and turn number are examined for sinusoidal and elliptical shaped bending configurations. It has been found that the loss increases as the bending radius and number of turns increase. The result also showed that elliptical shaped bending configuration produced more loss in contrast to that of sinusoidal shaped at bending angles of 180° and 360°. The study on the macro-bending loss in terms of curvature radius and turn number for both elliptical and sinusoidal shaped bending configurations is beneficial for future fiber optic sensor applications.

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