Q. Two joined step index fibers are perfectly aligned. What is the coupling loss of numerical aperture are NAʀ= 0.26 for emitting fiber?

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Q. Two joined graded index fibers that are perfectly aligned have refractive indices αʀ = 1.93 for receiving fiber αᴇ = 2.15 for emitting fiber. Calculate the coupling loss.

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Q. How many types of misalignments occur when joining compatible fiber?

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Q. Losses caused by factors such as core-cladding diameter, numerical aperture, relative refractive index differences, different refractive index profiles, fiber faults are known as ____________

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Q. A step index fiber has a coupling efficiency of 0.906 with uniform illumination of all propagation modes. Find the insertion loss due to lateral misalignment?

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Q. A graded index fiber has a parabolic refractive index profile (α=2) and core diameter of 42 μm. Estimate an insertion loss due to a 2 μm lateral misalignment when there is index matching and assuming there is uniform illumination of all guided modes only.

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Q. Determine coupling efficiency if the misalignment loss in a graded index fiber is 0.102.

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Q. In a single mode fiber, the losses due to lateral offset and angular misalignment are given by 0.20 dB and 0.46 dB respectively. Find the total insertion loss.

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Q. The intrinsic loss through a multimode fiber joint is independent of direction of propagation.

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Q. A permanent joint formed between two different optical fibers in the field is known as a ____________

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Q. How many types of fiber splices are available?

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Q. The insertion losses of the fiber splices are much less than the Fresnel reflection loss at a butted fiber joint.

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Q. What is the main requirement with the fibers that are intended for splicing?

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Q. In score and break process, which of the following is not used as a cutting tool?

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Q. The heating of the two prepared fiber ends to their fusing point with the application of required axial pressure between the two optical fibers is called as ____________

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Q. Which of the following is not used as a flame heating source in fusion splicing?

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Q. The rounding of the fiber ends with a low energy discharge before pressing the fibers together and fusing with a stronger arc is called as ____________

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Q. _____________ is caused by surface tension effects between the two fiber ends during fusing.

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Q. Average insertion losses as low as _________ have been obtained with multimode graded index and single-mode fibers using ceramic capillaries.

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Q. _____________ are formed by sandwiching the butted fiber ends between a V-groove glass substrate and a flat glass retainer plate.

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