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Explain about the number of modes in the optical fibres.
Mode in the optical fibres:
A mode is a path occupied by a ray of light through an optical fibre. This is a mathematical concept of describing the propagation of light waves into an optical fibre. The number of modes of propagation into a fibre depends onto the diameter of the fibre core. Generally, narrower of the fibre core lesser is the number of modes of propagation. Therefore on the basis of number of modes, fibres are categorized as:
a. Single-mode fibre
b. Multimode fibre
As shown in the figure below, a source at S is sending out a spherical wave: E 1 =(A ×D/r) cos( wt-2πr/ λ) ; where r is the distance to source S. In addition, there is anoth
An oil film (n = 1.45) on the surface of a puddle of water on the street is 118 nm thick. What frequency of light would be reflected? 2d= (m+1/2)λ/n oil
1. An ionization chamber is used on Tuesday (T=22°C, P=760mmHg) and then on Wednesday (T=25°C, P=740 mmHg) to monitor the output from an x-ray tube. If the output from the tube is
Copper constantan is used for measuring temperature up to (A) 1400 o C (B) 800 o C. (C) 1100 o C. (D) 400 o C. Ans: Copper constantan is used for meas
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With the help of relevant diagrams, define the following terms: (i) Pulse-position modulation (PPM) (i) Pulse-duration modulation (PPM)
Working of Current Time base generator
composition of two SHM at right angle to each other and having time period in the ratio of 1: 2
Inertia in an automobile You can view the same effect as in experiment 8 when you are riding in a car that is rapidly stopped. You have to brace yourself to keep from sliding
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