Q. ______________ is required in case of graded index fibers.

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Q. _______________ have been widely used to determine the refractive index profiles of optical fibers.

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Q. Which of the following is not an interference microscope?

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Q. What stands for x in the given equation?

δn = qλ/x

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Q. The ________ method gives an accurate measurement of the refractive index profile.

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Q. Which of the following is the main drawback of the slab technique?

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Q. ________________ method is used to measure the nonlinear refractive index of the silica fiber.

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Q. Near field scanning method provides a rapid method for acquiring the refractive index profile.

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Q. A multimode fiber has many cutoff wavelengths.

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Q. What does ‘a’ stands for in the given equation?

Mg=(πa/λ)²(n₁² – n₂²)

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Q. The _________ wavelength is defined as the wavelength greater than which the ratio of the total power and the fundamental mode power has to be decreased to less than 0.1 dB.

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Q. How many methods are used to determine the effective cutoff wavelength?

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Q. What is the name of the test used to determine the efficient values of the effective cutoff wavelength?

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Q. The effective cutoff wavelength for a cabled single mode fiber will be generally smaller than that of the un-cabled fiber.

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Q. How many bend effects are produced in the fiber?

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Q. _______________ method does not require a leaky mode correction factor or equal mode excitation.

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Q. The _______ method is the most commonly used method for the determination of the fiber refractive index profile.

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Q. The ____________ affects the light gathering capacity and the normalized frequency of the fiber.

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Q. The numerical aperture for a step index fiber is sine angle of the ____________

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Q. The calculations of the numerical aperture from a refractive index data are less accurate for the graded index fibers than for step index fibers.

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