Optical Fiber Coatings

Schmid, Steven R.; Toussaint, Anthony F.

doi:10.1016/b978-012369406-5/50006-0

Cited by 24 publications

(16 citation statements)

References 20 publications

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“…The widespread industrial success of optical fibers as a practical alternative to copper wiring could be attributed to these UV-curable coatings. 2 Two typical coating processes are employed for making the double-layer coatings on the bare glass fiber while being pulled at high speed, wet-on-dry (WOD) process and wet-on-wet (WOW) process. In WOD coating process, glass fiber passes through a primary coating applicator, followed by immediate curing of the coated liquid by the UV lamps, and then the fiber enters a secondary coating applicator, again followed by the UV lamps.…”

Section: Introductionmentioning

confidence: 99%

Theoretical prediction on double-layer coating in wet-on-wet optical fiber coating process

et al. 2010

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A theoretical investigation is conducted on the wet-on-wet (WOW) process for double-layer resin coating of optical glass fiber. The coating process in the secondary coating die is modeled as a simple two-layer Couette flow of two immiscible fluids in an annulus with an assigned pressure gradient. The assumption of fully developed flow permits an exact solution to the Navier-Stokes equations. The solution discloses the relevant parameters in design and operation of a WOW coating applicator of optical fiber. For a given diameter of glass fiber and primary coating thickness, the secondary coating thickness is a function of the applied pressure gradient, the diameter of coating die, the viscosity ratio, and the fiber drawing speed. The influences of each of these control parameters on double-layer coating are scrutinized. A practical concept of thermal control of the coating process utilizing temperature-dependent viscosity of coating resins is explored.

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Section: Introductionmentioning

confidence: 99%

Theoretical prediction on double-layer coating in wet-on-wet optical fiber coating process

et al. 2010

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“…Therefore stretching of the glass can cause cracking and flaking of the carbon coating, making it less suitable for some coiled acoustic sensors. Acrylate coatings have a further option of a single coating layer and a dual coating 5 . Each option has benefits according to the application, as outlined in Table 2.…”

Section: Optical Fiber Sensors In Oil and Gas Explorationmentioning

confidence: 99%

A polarisation maintaining fiber optimized for high temperature gyroscopes

et al. 2015

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Fiber optic gyroscopes (FOGs) are being used within increasingly severe environments, requiring operational temperatures in excess of the standard operating range for FOGs. Applications requiring these higher temperatures include: directional drilling of wells in oil and gas fields, space applications and military FOG applications. This paper will describe the relative merits of two high temperature acrylate coatings for an optical fiber designed for a FOG in such operating environments.Results for two high temperature acrylates are presented, tested in a 200m length of loose wound fiber, coiled and supported at 75mm diameter, in line with TIA/EIA- . It can be seen that both coating types give very good polarization extinction ratio (PER) performance at high temperature up to 180 o C, with better performance shown by one coating type on the low temperature side, since it does not harden to the same extent below 0 o C.The long term thermal exposure effects will be discussed and experimental results presented which include testing the PER performance over temperature both before and after an extended period of high temperature endurance. This will demonstrate the relative merits of different styles of coatings. From the PER performance, the h-parameter of the fiber can be calculated and hence the preferred coating type selected and recommended for the customer operating environment.

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“…1(a). The dark blue section represents the secondary coating, which is strong enough to protect the fiber from mechanical damage [13]. The primary coating, inner layer, is however made of soft visco-elastic materials in order to reduce the attenuation caused by microbending.…”

Section: A Thermomechanical Modelmentioning

confidence: 99%

“…See http://www.ieee.org/publications standards/publications/rights/index.html for more information. strong outer layer (secondary coating) protects the fiber and a soft inner layer (primary coating) adheres the outer layer and the optical fiber together [13]. Actually, the CTE of this coating is also high, but it demonstrates almost no impact on the thermal response of the fiber, because the soft inner layer hinders the thermally-induced strain transferred from the coating to the silica fiber.…”

Section: Introductionmentioning

confidence: 99%

“…Actually, the CTE of this coating is also high, but it demonstrates almost no impact on the thermal response of the fiber, because the soft inner layer hinders the thermally-induced strain transferred from the coating to the silica fiber. However, as the inner layer becomes stiffer at low temperature, the impact of the thermal expansion of the coatings can no longer be neglected [13], and a higher temperature sensitivity can be expected. In this paper, the impact of the thermally-induced strain on the temperature response of Brillouin and Rayleigh distributed sensors is investigated theoretically and experimentally based on the thermomechanical behavior of SMFs with different coatings.…”

Section: Introductionmentioning

confidence: 99%

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Impact of the Fiber Coating on the Temperature Response of Distributed Optical Fiber Sensors at Cryogenic Ranges

Soto

Thévenaz

2018

J. Lightwave Technol.

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The thermomechanical behavior of a standard singlemode fiber with different coating materials is theoretically analyzed under different temperature conditions. Results show that the thermal expansion/shrinkage of the fiber coating introduces an extra strain on the optical fiber and can modify its thermal response. Distributed fiber sensors based on coherent Rayleigh and Brillouin scatterings are employed to characterize the impact of different coatings on the temperature sensitivity. The standard coating with dual-layer demonstrates a little influence on the thermal response at room temperature due to the softness of primary coating, but it increases the temperature sensitivity by some 50% at ∼220 K as the primary coating becomes stiffer at low temperature. Optical fibers with aluminum and Ormocer coatings are also experimentally tested. All the measured results agree well with the theoretical analysis.

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Optical Fiber Coatings

Cited by 24 publications

References 20 publications

Theoretical prediction on double-layer coating in wet-on-wet optical fiber coating process

Theoretical prediction on double-layer coating in wet-on-wet optical fiber coating process

A polarisation maintaining fiber optimized for high temperature gyroscopes

Impact of the Fiber Coating on the Temperature Response of Distributed Optical Fiber Sensors at Cryogenic Ranges

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