Fiber Optics Structural Mechanics: Brief Review

Suhir, Ephraïm

doi:10.1115/1.2792625

Cited by 12 publications

(2 citation statements)

References 39 publications

(30 reference statements)

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“…Compressive and tensile interfacial normal stresses induce microbending loss in the glass fiber and delamination of the coating, respectively, so both have been extensively studied. [3][4][5][6][7] Thermal shear stress also exists at the interface between the glass fiber and the primary coating. If this interfacial stress exceeds the adhesive strength, the polymeric coatings will be delaminated from the glass fibers and the optical fiber will thus lose its mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Long-term thermally interfacial-shear-stress-induced delamination of polymeric coatings from glass fibers in double-coated optical fibers

Shen

2003

Opt. Eng

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This study investigates the delamination of polymeric coatings from glass fibers in double-coated optical fibers, induced by longterm thermal interfacial shear stress. The shear stress between the fiber and the primary coating should always be lower than the interfacial shear strength to prevent delamination. It can be minimized by properly selecting the physical properties of the coatings as follows: The thickness and Young's modulus of the secondary coating can be decreased so long as the requirement for the strength of the secondary coating is satisfied. The thickness of the primary coating can be increased if the spring constant of the optical fiber is chosen to prevent microbending of the glass fiber at low temperature. Meanwhile, Poisson's ratio of the primary coating is set very close to 0.5. The Young's modulus and the relaxation time of the primary coating, and the thermal expansion coefficient and the relaxation time of the secondary coating, should all be minimized.

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Section: Introductionmentioning

confidence: 99%

Long-term thermally interfacial-shear-stress-induced delamination of polymeric coatings from glass fibers in double-coated optical fibers

Shen

2003

Opt. Eng

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“…Various problems of the thermal stress modeling in bare and coated optical silica fibers are addressed in [3,7,[87][88][89][90][91][92][93][94][95][96][97][98]. Low temperature microbending can result in substantial added transmission losses in dual-coated optical fibers.…”

Section: Optical Fibers and Other Photonic Structuresmentioning

confidence: 99%

Analytical Thermal Stress Modeling in Physical Design for Reliability of Micro- and Opto-Electronic Systems: Role, Attributes, Challenges, Results

Suhir

Micro- And Opto-Electronic Materials and Structures: Physics, Mechanics, Design, Reliability, Packaging

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"Mathematical formulas have their own life, they are smarter than we, even smarter than their authors, and provide more than what has been put into them"Heinrich Hertz, German Physicist "If my theory is in conflict with the experiment, I pity the experiment", Friedrich Hegel, German Philisopher"A formula longer than three inches is most likely wrong" Unknown Reliability Engineer ABSTRACTSome basic thermal stress and thermal stress related reliability problems in microelectronics (ME) and optoelectronics (OE) are addressed. The emphasis is on analytical ("mathematical") stress modeling and design for reliability. The review is based primarily on the author's research conducted during his eighteen-year tenure with Bell Laboratories, Basic Research, Physical Sciences and Engineering Research Division, as well as on his recent research, based on government contracts. THERMAL LOADING AND THERMAL STRESS FAILURESVarious areas of engineering differ, from the Structural Analysis and Structural Reliability point of view, by the employed materials, typical structures used, and the nature of the applied loads. The most typical ME and OE structures are bodies made of a large variety of dissimilar materials. The most typical loads are thermal loads. These are caused by CTE mismatch and/or by temperature gradients [1][2][3][4][5][6][7][8].Thermal loading takes place during the normal operation of the system, as well as during its fabrication, testing, or storage. Thermal stresses, strains and displacements are the major contributor to the finite service life and elevated failure rate of ME and OE equipment. Examples are ductile rupture, brittle fracture, thermal fatigue, creep, excessive deformation or displacement, stress relaxation (that might lead to excessive displacements), thermal shock, stress corrosion.Elevated thermal stresses and strains can lead not only to structural ("physical") failure, but also to functional (electrical or optical) failure. If the heat, produced by the chip, cannot readily escape, then the high thermal stress in the IC can result in failure of the p-n junction [9]. Low temperature microbending (buckling of the glass fiber within the low modulus primary coating) in dual-coated optical fibers, although might be too small to lead to appreciable bending stresses and delayed fracture ("static fatigue"), can result in appreciable added transmission losses. Loss in optical coupling efficiency can occur, when the displacement in the lateral (often less than 0.2 micrometers) or angular (often less than a split of one percent of a degree) misalignment in the gap between two light-guides or between a light source and a light-guide becomes too large, because of thermally induced deformations or because of thermal stress relaxation in a laser weld. Small lateral or angular displacements in MEMS-based photonic systems (such as, say, some types of tunable lasers) can lead to a complete optical failure of the device. Tiny temperature-change-induced changes in the distance between Bragg gratings "written" on an ...

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Fiber Optics Structural Mechanics and Nano-Technology Based New Generation of Fiber Coatings: Review and Extension

Suhir

Micro- And Opto-Electronic Materials and Structures: Physics, Mechanics, Design, Reliability, Packaging

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Fiber Optics Structural Mechanics: Brief Review

Cited by 12 publications

References 39 publications

Long-term thermally interfacial-shear-stress-induced delamination of polymeric coatings from glass fibers in double-coated optical fibers

Long-term thermally interfacial-shear-stress-induced delamination of polymeric coatings from glass fibers in double-coated optical fibers

Analytical Thermal Stress Modeling in Physical Design for Reliability of Micro- and Opto-Electronic Systems: Role, Attributes, Challenges, Results

Fiber Optics Structural Mechanics and Nano-Technology Based New Generation of Fiber Coatings: Review and Extension

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