Q. Lens-coupled expanded beam connectors exhibit average losses of _________ in case of single mode and graded index fibers.

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Q. Sapphire ball lens expanded beam design is successful than spherical lens coupled design.

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Q. The fiber is positioned at the ________ of the lens in order to obtain a collimated beam and to minimize lens-to-lens longitudinal misalignment effects.

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Q. ___________ exhibits a parabolic refractive index profile with a maximum at the axis similar to graded index fiber.

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Q. The GRIN-rod lens can produce a collimated output beam with a divergent angle α of between _____________ from a light source situated on, or near to, the opposite lens face.

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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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