Q. A _____________ coupler comprises a number of cascaded stages, each incorporating three or four-port FBT couplers to obtain a multiport output.

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Q. A number of three-port single-mode fiber couplers are used in the fabrication of a ladder coupler with 16 output ports. The three-port couplers each have an excess loss of 0.2 dB along with a splice loss of 0.1 dB at the interconnection of each stage. Determine the excess loss.

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Q. An FBG is developed within a fiber core having a refractive index of 1.30. Find the grating period for it to reflect an optical signal with a wavelength of 1.33 μm.

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Q. It is a passive device which allows the flow of optical signal power in only one direction and preventing reflections in the backward direction.

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Q. Which feature of an optical isolator makes it attractive to use with optical amplifier?

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Q. Magneto-optic devices can be used to function as isolators.

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Q. How many implementation methods are available for optical isolators?

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Q. A device which is made of isolators and follows a closed loop path is called as a ____________

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Q. The commercially available circulators exhibit insertion losses around ________________

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Q. A combination of a FBG and optical isolators can be used to produce non-blocking optical wavelength division add/draw multiplexers.

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