Optical Fiber Corrosion: Coating Contribution to Zero-Stress Aging

Yuce, Hakan H.; Varachi, John P.; Kilmer, Joyce; Kurkjian, Charles R.; Matthewson, M. John

doi:10.1364/ofc.1992.pd21

Cited by 20 publications

(9 citation statements)

References 3 publications

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“…[1][2][3]In contrast, the present aging was done slowly, over a longer time, and involved removing the fibers from their soaking environment for a few hours every second month. This may have resulted in glass surface corrosion that is different from what occurs during continuous and rapid accelerated aging.…”

Section: Discussionmentioning

confidence: 99%

Aging behavior of fibers

1993

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Section: Discussionmentioning

confidence: 99%

Aging behavior of fibers

1993

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“…This is certainly the case for the corrosive regime in which the coating can have a dramatic effect on the onset of the zero-stress aging degradation. 9 In contrast, it appears that many coatings do not perturb the crack growth kinetics provided sufficient time is allowed for equilibration with the test environment. [10][11][12] These results are persuasive because they directly compare coated and bare fiber behavior.…”

Section: Effect Of Coatingsmentioning

confidence: 99%

Chemical Kinetics Models for the Fatigue Behavior of Fused Silica Optical Fiber

Matthewson

1998

MRS Proc.

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There have been numerous studies of the fatigue and strength behavior of fused silica optical fibers. However, no coherent model has emerged that self-consistently describes the simultaneous effects of stress, temperature and activity of the corroding species (e.g. water). A power law degradation kinetics model (relating the crack growth rate to the applied stress intensity factor, K I ) is widely used although various exponential forms based on chemical rate theory have also been proposed. The dependence of fatigue on parameters such as humidity, pH and temperature, has usually been treated in an empirical manner. Sometimes it is even ignoredfor example, the service environment is often assumed to be the same as the proof test environment when making lifetime predictions, thus avoiding the need for understanding the humidity dependence; this assumption is often unjustified. This paper reviews the dependence of fatigue on environmental factors and highlights some of the inconsistencies in published data. It is then attempted to present a coherent kinetics model that simultaneously accounts for stress temperature, humidity, etc. Several possible forms of the model are compared to a range of experimental data of several different types. The comparison is made using fitting techniques that account for correlation between fit parameters. It is found that a simple exponential form of the degradation kinetics model gives the best overall description of the temperature, humidity and pH effects on static and dynamic fatigue. It should be noted that the exponential form predicts shorter lifetimes than the ubiquitous power law model. Therefore, under some circumstances, the predictions of "worst case" models based on power law kinetics are unduly optimistic.

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“…VCk, (2) where k is the order of the reaction (i.e. the number of water molecules required to rupture one bond).…”

Section: Static Fatigue Modelmentioning

confidence: 99%