Q. The beat length in a single mode optical fiber is 8 cm when light from a laser with a peak wavelength 0.6 μm is launched into it. Estimate the modal birefringence.

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Q. Beat length of a single mode optical fiber is 0.6 cm. Calculate the difference between propagation constants for the orthogonal modes.

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Q. A polarization maintaining fiber operates at a wavelength 1.2 μm and have a modal birefringence of 1.8*10⁻³. Calculate the period of perturbation.

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Q. When two components are equally excited at the fiber input, then for polarization maintaining fibers δΓg should be around ___________

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Q. Polarization modal noise can _________ the performance of communication system.

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Q. The nonlinear effects in optical fibers are large.

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Q. How many categories of nonlinear effects are seen in optical fibers?

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Q. Which of the following is not related to Kerr effects?

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Q. Linear scattering effects are _______ in nature.

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Q. Which thing is more dominant in making a fiber function as a bidirectional optical amplifier?

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Q. _________ semiconductor laser sources generally have broader bandwidths.

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Q. Nonlinear effects which are defined by the intensity – dependent refractive index of the fiber are called as ________

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Q. Self-phase modulation causes modifications to the pulse spectrum.

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Q. Self-phase modulation can be used for _____________

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Q. The beating between light at different frequencies or wavelengths in multichannel fiber transmission causes ________

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Q. What is different in case of cross-phase modulation from self-phase modulation?

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Q. When three wave components co-propagate at angular frequency w1, w2, w3, then a new wave is generated at frequency w4, which is given by?

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Q. _____________ results from a case of nonlinear dispersion compensation in which the nonlinear dispersion compensation in which the nonlinear chirp caused by self-phase modulation balances, postpones, the temporal broadening induced by group velocity delay.

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