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Optical Communication: Fiber Optic Components
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Optical Communication: Fiber Optic Components
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25 Questions

1. What is the use of watch jewel in cylindrical ferrule connector?
2. How many types of fiber splices are available?
3. The commercially available circulators exhibit insertion losses around ________________
4. Calculate the splitting loss if a 30×30 port multimode fiber star coupler has 1 mW of optical power launched into an input port.
5. P2O5 is used as a _____________
6. In case of multiple fusion, splice losses using an electric arc fusion device with multimode graded index fiber range from ____________
7. Only graded index fibers are made with the help of vapor-phase deposition techniques.
8. 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 1.33μm.
9. Determine coupling efficiency if the misalignment loss in a graded index fiber is 0.102.
10. What is the use of an index-matching material in the connector between the two jointed fibers?
11. The ratio r = (n1 '
12. How many manufacturing methods are used for producing multimode fiber star couplers?
13. How many types of vapor-phase deposition techniques are present?
14. In score and break process, which of the following is not used as a cutting tool?
15. When considering source-to-fiber coupling efficiencies, the ________ is an important parameter than total output power.
16. The insertion losses of the fiber splices are much less than the Fresnel reflection loss at a butted fiber joint.
17. Mean splice insertion losses of 0.05 dB are obtained using multimode graded index fibers with the Springroove splice.
18. Which is the most common method for manufacturing couplers?
19. _____________ are formed by sandwiching the butted fiber ends between a V-groove glass substrate and a flat glass retainer plate.
20. Demountable fiber connectors are more difficult to achieve than optical fiber splices.
21. A GaAs optical source having a refractive index of 3.2 is coupled to a silica fiber having a refractive index of 1.42. Determine Fresnel reflection at interface in terms of percentage.
22. Modified Chemical Vapor Deposition (MCVD) process is also called as an inside vapor phase oxidation (IVPD) technique.
23. A _____________ coupler comprises a number of cascaded stages, each incorporating three or four-port FBT couplers to obtain a multiport output.
24. _____________ technique is method of preparing extremely pure optical glasses.
25. A graded index fiber has a parabolic refractive index profile (α=2) and core diameter of 42μm. Estimate an insertion loss due to a 2 μm lateral misalignment when there is index matching and assuming there is uniform illumination of all guided modes only.

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