31. Velocity of light travelling in an optical fibre is
32. In an optical fiber, dispersion:
33. Multimode graded index fibers are manufactured from materials with
34. Which one of the following is capable of giving the highest data speed?
35. Maximum data rate of a channel for a noiseless 2-kHz binary channel is-
36. A digital optical fiber communication system operating at a wavelength of 1 µm requires a maximum bit error rate of 10-9. What is the theoretical quantum limit at the receiver in terms of the quantum efficiency of the detector and the energy of an incident photon?
37. Match List-I with List-II and select
the correct answer using the options given below:
List-I (Different Fibre Generation)
List-II (Optical Components Used)
a. First
1. Graded index multimode fibre and 1310 nm LD
b. Second
2. Graded index multimode fibre and 850 nm LD
c. Third
3. Step index monomode fibre and 1550 nm LD
d. Fourth
4. Step index monomode fibre and 1310 nm LD
| List-I (Different Fibre Generation) | List-II (Optical Components Used) |
| a. First | 1. Graded index multimode fibre and 1310 nm LD |
| b. Second | 2. Graded index multimode fibre and 850 nm LD |
| c. Third | 3. Step index monomode fibre and 1550 nm LD |
| d. Fourth | 4. Step index monomode fibre and 1310 nm LD |
38. The cladding which surrounds the fibre core
39. A certain optical fiber has refractive index of clad (n1) = 1.40 and that of core (n2) = 1.05. Its numerical aperture will be
40. Losses in optical fibers can be caused by
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