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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 12: Fibre Optics"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 12.1: Numerical_aperture_and_acceptance_angle_of_optical_fibre.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"// Scilab Code Ex12.1: Page-12.6 (2004)\n",
"clc;clear;\n",
"n1 = 1.54; // Refractive index of fibre core\n",
"n2 = 1.50; // Refractive index of fibre cladding\n",
"NA = sqrt(n1^2 - n2^2); // Numerical aperture for optical fibre\n",
"// As sin(theta_a) = sqrt(n1^2 - n2^2), solving for theta_a\n",
"theta_a = asind(sqrt(n1^2 - n2^2)); // acceptance angle of optical fibre, degrees\n",
"printf('\nNumerical aperture for optical fibre = %5.3f', NA);\n",
"printf('\nThe acceptance angle of optical fibre = %4.1f degrees', theta_a);\n",
"\n",
"// Result\n",
"// Numerical aperture for optical fibre = 0.349\n",
"// The acceptance angle of optical fibre = 20.4 degrees \n",
""
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 12.2: V_and_mode_of_optical_fibre.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"// Scilab Code Ex12.2: Page-12.13 (2004)\n",
"clc;clear;\n",
"n1 = 1.53; // Refractive index of fibre core\n",
"n2 = 1.50; // Refractive index of fibre cladding\n",
"lamb = 1e-6; // absolute wavelength. m\n",
"d = 50e-6; // radius of core in m\n",
"V = 2*%pi/lamb*d*sqrt(n1^2 - n2^2); // volume of opical fibre\n",
"N = V^2/2; // no. of possible modes\n",
"printf('\nV of opical fibre = %6.2f ', V);\n",
"printf('\nNo. of possible modes = %5.3f ', N);\n",
"\n",
"// Results\n",
"// V of opical fibre = 94.72 \n",
"// No. of possible modes = 4485.735 "
]
}
,
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 12.3: Loss_in_signal.sce"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"// Scilab Code Ex12.3: Page-12.20 (2004)\n",
"clc;clear;\n",
"po = 40; // Refractive index of fibre core\n",
"pi = 100; // Refractive index of fibre cladding\n",
"p = po/pi; // ratio of powers\n",
"L = -10*(log(po/pi)); // Refractive index of medium\n",
"\n",
"printf('\nLoss in dB = %f dB', L);\n",
"\n",
"// Result\n",
"// Loss in dB = 9.162907 dB"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Scilab",
"language": "scilab",
"name": "scilab"
},
"language_info": {
"file_extension": ".sce",
"help_links": [
{
"text": "MetaKernel Magics",
"url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
}
],
"mimetype": "text/x-octave",
"name": "scilab",
"version": "0.7.1"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
