Q. In the given equation, if r is the radial distance, n is the refractive index; what does z stands for?

dr²/dz² = (1/n) (dn/dr)

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Q. The majority of the GRIN-rod lenses have diameters in the range of ____________

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Q. Which of the following factors does not cause divergence of the collimated beam from a GRIN-rod lens?

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Q. GRIN-rod lens connectors have loss characteristics that are independent of the modal power distribution in the fiber.

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Q. When considering source-to-fiber coupling efficiencies, the ________ is an important parameter than total output power.

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Q. It is a device that distributes light from a main fiber into one or more branch fibers.

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Q. Optical fiber couplers are also called as ________________

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Q. How many types of multiport optical fiber couplers are available at present?

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Q. The optical power coupled from one fiber to another is limited by ____________

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Q. ________ couplers combine the different wavelength optical signal onto the fiber or separate the different wavelength optical signal output from the fiber.

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Q. How many fabrication techniques are used for 3 port fiber couplers?

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Q. Which is the most common method for manufacturing couplers?

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Q. Couplers insertion loss is same as that of excess loss.

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Q. A four-port multimode fiber FBT coupler has 50 μW optical power launched into port 1. The measured output power at ports 2,3 and 4 are 0.003, 23.0 and 24.5 μW respectively. Determine the excess loss.

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Q. A four-port FBT coupler has 60 μW optical power launched into port one. The output powers at ports 2, 3, 4 are 0.0025, 18, and 22 μW respectively. Find the split ratio?

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Q. How many manufacturing methods are used for producing multimode fiber star couplers?

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Q. Calculate the splitting loss if a 30×30 port multimode fiber star coupler has 1 mW of optical power launched into an input port.

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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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