Q. The difference between the modes’ refractive indices is called as ___________

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Q. A single mode fiber has a beat length of 4 cm at 1200 nm. What is birefringence?

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Q. How many propagation modes are present in single mode fibers?

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Q. Numerical aperture is constant in case of step index fiber.

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Q. Plastic fibers are less widely used than glass fibers.

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Q. Photonic crystal fibers also called as ___________

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Q. Conventional optical fibers has more transmission losses than photonic crystal fibers.

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Q. Losses in photonic crystal fibers are reduced to a level of ___________

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Q. The high index contrast enables the PCF core to be reduced from around 8 μmin conventional fiber to __________

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Q. The periodic arrangement of cladding air holes in photonic band gap fibers provides for the formation of a photonic band gap in the ___________

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Q. In index-guided photonic crystal fiber structure, the dark areas are air holes. What does white areas suggests?

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Q. Which is the unit of measurement of attenuation in optical fibers?

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Q. The optical fiber incurs a loss in signal power as light travels down the fiber which is called as ___________

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Q. If the input power 100 μW is launched into 6 km of fiber, the mean optical power at the fiber output is 2 μW. What is the overall signal attenuation through the fiber assuming there are no connectors or splices?

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Q. A device that reduces the intensity of light in optical fiber communications is ___________

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Q. A decibel may be defined as the ratio of input and output optical power for a particular optical wavelength.

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Q. When the input and output power in an optical fiber is 120 μW and 3 μW respectively and the length of the fiber is 8 km. What is the signal attenuation per km for the fiber?

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