21. Single mode fibers allow single mode propagation; the cladding diameter must be at least
22. Insertion of a record in a linked list involves the modification of
23. Which one of the following is the ratio of power lost per unit length to the twice of power transmitted?
24. Dispersion in an optical fibre used in a communication link is of which type?
25. The cladding that surrounds the fibre core:
26. Which optical detector is used when high sensitivity and bandwidth are required?
27. Which among the following is provided by an optical receiver for the regeneration of data signal with minimum error?
28. In an optical communication system, having an operating wavelength λ in meters, only X% of its source frequency can be used as its channel bandwidth. The systems is to be used for transmitting TV signal requiring a bandwidth of f Hz. The number of channels transmitted by this system simultaneously is (c = speed of light)
29. The cut-off wavelength for an optical fibre with 5 µm core diameter and core cladding indices of refraction 1.84 and 1.402 is nearly
30. Which one of the following statements is NOT true for a step index optical fibre?
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