&lt;title&gt;Heat-flow modeling and visualization of catastrophic self-propagating damage in single-mode optical fibers at low powers&lt;/title&gt;

Kashyap, Raman; Sayles, Andre H.; Cornwell, G. F.

doi:10.1117/12.274219

Cited by 16 publications

(14 citation statements)

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“…Thereafter, there is a rapid increase in the α value. These results are consistent with the experimental results obtained by Kashyap and colleagues [9].…”

Section: Thermally Induced Optical-power Absorptionsupporting

confidence: 95%

Generation mechanism on fiber fuse phenomenon in single‐mode optical fibers

Shuto

Yanagi

Asakawa

et al. 2003

Electron Comm Jpn Pt II

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SUMMARYUnsteady-state thermal conduction process in the single-mode (SM) optical fiber was theoretically studied with the explicit finite-difference method. In the numerical calculation it was assumed that the electrical conductivity of the core layer increased rapidly above 1050 °C. The core-center temperature changed suddenly and reached over ten thousand Kelvin when the optical power of 1 W was input to the core layer heated above 1000 °C. This rapid heating phenomenon also occurred when the optical power was reflected at the edge wall of the thermally produced cavity in the core layer. The occurrence of this phenomenon was restricted by the decrease in either the input optical power or the normalized frequency of the SM optical fiber.

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“…Thereafter, there is a rapid increase in the α value. These results are consistent with the experimental results obtained by Kashyap and colleagues [9].…”

Section: Thermally Induced Optical-power Absorptionsupporting

confidence: 95%

Generation mechanism on fiber fuse phenomenon in single‐mode optical fibers

Shuto

Yanagi

Asakawa

et al. 2003

Electron Comm Jpn Pt II

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“…Using (1) and the optical constants, the absorption coefficient of graphite is estimated to be = 2.79 × 10 7 m −1 . This value is of about three orders of magnitude larger than the values (10 4 m −1 order) [6,31] required for fiber fuse generation.…”

Section: Absorption Coefficient Of Carbon Blackmentioning

confidence: 76%

End Face Damage and Fiber Fuse Phenomena in Single-Mode Fiber-Optic Connectors

Shuto¹

2016

Journal of Photonics

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The evolution of both the core melting and fiber fuse phenomena in a single-mode fiber-optic connector was studied theoretically. Carbon black was chosen as a light-absorbent material. A thin absorbent layer with a thickness of 1 m order was assumed to be formed between the fiber end faces in the connector. When a high-power laser operating at 1.48 or 1.55 m was input into the connector, the temperature on the fiber core surface increased owing to heat conduction from the light-absorbent material. The heat flow process of the core, which caused the core to melt or the fiber fuse phenomenon, was theoretically calculated with the explicit finite-difference method. The results indicated that initial attenuation of less than 0.5 dB was desirable to prevent core fusion in the connectors when the input 1.48 m laser power was 1 W. It was found that a core temperature of more than 4000 K was necessary to generate and maintain a fiber fuse.

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“…Shuto et al (Shuto et al, 2004 b ) have also proposed that the formation of Ge related defects could increase the number of free electrons and the subsequent electrical conductivity of the fibre core then enhances the absorption. In their opinion, this mechanism would explain the absorption values reported by Kashyap (Kashyap et al, 1997). This latter model also results in an Arrhenius law.…”

Section: Theoretical Modelmentioning

confidence: 53%