4 (a) “There are three types of optical fibers available for optic communication”. What are these three types and describe each. You may use diagrams to help you with your answers.
4 (a) “There are three types of optical fibers available for optic communication”. What are these three types and describe each. You may use diagrams to help you with your answers.
(b) Pin diodes and Avalanche photodiodes (APD) are detectors which are used to convert the transmitted light back into an electrical signal
I. Describe the operating principles of a PIN diode and an Avalanche photodiode
II. The quantum efficiency of APD is 80% for the detection of radiation at a wavelength of 0.9 μm. When the incident optical power is 0.5 μW, the output current from the device (after avalanche gain) is 11 μA. Determine the multiplication factor of the photodiode under these conditions.
(c) A silica optical fibre with a core diameter large enough to be considered by ray theory analysis has a core refractive index of 1.480 and a cladding refractive index of 1.44. Determine:
I. The critical angle at the core–cladding interface
II. The acceptance angle in air for the fibre.
Step by step
Solved in 4 steps with 3 images
