Q. Which of the following is not a metallic impurity found in glass in extrinsic absorption?

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Q. Optical fibers suffer radiation losses at bends or curves on their paths.

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Q. A multimode fiber has refractive indices n1 = 1.15, n2 = 1.11 and an operating wavelength of 0.7 μm. Find the radius of curvature?

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Q. A single mode fiber has refractive indices n1=1.50, n2 = 2.23, core diameter of 8 μm, wavelength = 1.5 μm cutoff wavelength = 1.214 μm. Find the radius of curvature?

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Q. How the potential macro bending losses can be reduced in case of multimode fiber?

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Q. Sharp bends or micro bends causes significant losses in fiber.

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Q. Rayleigh scattering and Mie scattering are the types of _____________

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Q. Dominant intrinsic loss mechanism in low absorption window between ultraviolet and infrared absorption tails is ___________

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Q. Rayleigh scattering can be reduced by operating at smallest possible wavelengths.

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Q. The scattering resulting from fiber imperfections like core-cladding RI differences, diameter fluctuations, strains, and bubbles is?

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Q. Mie scattering has in-homogeneities mainly in ___________

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Q. The in-homogeneities in Mie scattering can be reduced by coating of a fiber.

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Q. Raman and Brillouin scattering are usually observed at ___________

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Q. The phonon is a quantum of an elastic wave in a crystal lattice.

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Q. A single-mode optical fiber has an attenuation of 0.3 dB/km when operating at wavelength of 1.1 μm. The fiber core diameter is 4 μm and bandwidth is 500 MHz. Find threshold optical power for stimulated Brillouin scattering.

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Q. 0.4 dB/km, 1.4 μm, 6 μm, 550MHz. Find threshold optical power for stimulated Raman scattering.

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Q. Stimulated Brillouin scattering is mainly a ___________

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Q. High frequency optical phonon is generated in stimulated Raman scattering.

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Q. Stimulated Raman scattering occur in ___________

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Q. Stimulated Raman scattering may have an optical power threshold of may be three orders of magnitude ___________

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