Fundamentals of Electromagnetics with Engineering Applications
Fundamentals of Electromagnetics with Engineering Applications
1st Edition
ISBN: 9780470105757
Author: Stuart M. Wentworth
Publisher: Wiley, John & Sons, Incorporated
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Chapter 7, Problem 7.30P
To determine

The power margin and maximum frequency of analog signal.

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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.
(c) Figure Q(c) shows the electron mobility in a semiconductor with different dopant concentrations as a function of temperature. Explain the scattering mechanisms in the semiconductor that responsible for such results. 10000 N -tos 1000 100 10 70 100 S00 Temperature (K) Figure Q(c) Electron Drift Mobility(cm Vls)
What are transferred electron devices (TEDs)? A Gunn diode, being one example of TED is atwo-terminal passive semiconductor electronic component, which is used in high-frequencyelectronics. Discuss the principle of operation of this diode with help of energy band diagram.
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