Reference no: EM132595027

Question 1

Calculate the carrier frequency for optical communication systems operating at 0.88, 1.3 and 1.55 μm.

Question 2

Calculate the transmission distance over which the optical power will attenuate by a factor of 10 for three fibres with losses of 0.2, 20, and 2000 dB/km. Assuming that the optical power decreases as exp(-αL), calculate α (in cm^-1) for the three fibres.

Question 3

Assume that a digital communication system can be operated at a bit rate of up to 1% of the carrier frequency. How many audio channels at 64 kb/s can be transmitted over a microwave carrier at 5 GHz and an optical carrier at 1.55 μm?

Question 4

A 1-hour lecture script is stored on the computer hard disk in ASCII format (which assigns a number in the range 0-127 to each letter of the alphabet). Estimate the total number of bits assuming a delivery rate of 200 words per minute and on average 5 letters per word. How long will it take to transmit the script at a bit rate of 1 Gb/s?

Question 5

A silica optical fibre with a core diameter large enough to be considered by ray theory analysis has a core refractive index of 1.5 and a cladding refractive index of 1.47. Determine (a) the critical angle at the core-cladding interface; (b) the NA for the fibre; (c) the acceptance angle in air for the fibre.

Question 6

Describe how light propagate inside an optical fibre.