Q. An Si-O bond with a Young’s modulus of 9*10¹⁰ nm⁻¹ have an elliptical crack of depth 7 nm. The surface energy is 2.29 J. Estimate fracture stress for silica fiber.

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Q. Calculate percentage strain at break for a Si-O bond with a fracture strength of 3.52*10¹⁰ nm⁻¹ and Young’s modulus of 9 *10⁹ nm⁻¹.

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Q. Stress corrosion must be considered while designing and testing optical fiber cables.

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Q. Which statistics are used for calculations of strengths of optical fibers?

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Q. What does n denotes in the equation given below, if vc is the crack velocity; A is the constant for the fiber material and KI is the strength intensity factor?

vc = AKIⁿ

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Q. ____________ results from small lateral forces exerted on the fiber during the cabling process.

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Q. Microscopic meandering of the fiber core axis that is micro-bending is caused due to ___________

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Q. How many forms of modal power distribution are considered?

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Q. What does micro-bending losses depend on _____________

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Q. The fiber should be________________ to avoid deterioration of the optical transmission characteristics resulting from mode-coupling-induced micro-bending.

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Q. The diffusion of hydrogen into optical fiber affects the ______________

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Q. __________ can induce a considerable amount of attenuation in optical fibers.

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Q. The radiation-induced attenuation can be reduced through photo-bleaching.

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Q. The losses due to hydrogen absorption and reaction with fiber deposits can be temporary.

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Q. The losses caused due to hydrogen absorption mechanisms are in the range of ___________

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Q. The cable must be designed such that the strain on the fiber in the cable does not exceed __________

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Q. How many categories exists in case of cable design?

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Q. How many types of buffer jackets are used in fiber buffering?

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Q. Loose tube buffer jackets exhibits a low resistance to movement of the fiber.

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Q. An inclusion of one or more structural members in an optical fiber so as to serve as a cable core foundation around which the buffer fibers may be wrapped is called _____________

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