Q. Optical fibre communications uses _______ dielectric waveguide structures for confining light.

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Q. __________ waveguide is formed when the film is sandwiched by layers of different refractive index.

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Q. When the dimensions of the guide are reduced, the number of ___________ also decreases.

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Q. What does hff stands for in the equation hff = h+x+x²?

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Q. ___________ waveguides are plagued by high losses.

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Q. The planar waveguides may be fabricated from glasses and other isotropic materials such as ___________ and ______________

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Q. Which of the following devices are less widely used in the field of optical fibre communications?

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Q. Which of the following materials have refractive index near two?

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Q. Passive devices are fabricated by __________ technique.

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Q. Strip pattern in waveguide structures is obtained through ____________

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Q. Propagation losses in slab and strip waveguides are smaller than the single mode fibre losses.

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Q. A passive Y-junction beam splitter is fabricated from __________

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Q. A passive Y-junction beam splitter is also used as a switch.

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Q. The linear variation of refractive index with the electric field is known as the ________

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Q. Planar waveguides are used to produce _______ coupler.

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Q. Monolithic integration for optical sources are confined to the use of __________ semiconductors.

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Q. Circuits fabricated from GaAs or AlGaAs operate in wavelength region of __________

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Q. The OEICs realization __________ as compared to the other developments in IO.

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Q. Compositional and structural differences between photonic and electronic devices __________

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Q. To avoid large chip __________ devices are used.

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