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diff --git a/Engineering_Physics_by_PV_Naik/Chapter13.ipynb b/Engineering_Physics_by_PV_Naik/Chapter13.ipynb new file mode 100755 index 00000000..83323d13 --- /dev/null +++ b/Engineering_Physics_by_PV_Naik/Chapter13.ipynb @@ -0,0 +1,386 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:46a82c7fe1b65af7ee26b9fa38521b26c61cee31bc75dd5001fe45442416739c"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "13: Optical Fibre"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.1, Page number 250"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "n1=1.49; #refractive index of core\n",
+ "n2=1.46; #refractive index of cladding\n",
+ "\n",
+ "#Calculation \n",
+ "NA=math.sqrt((n1**2)-(n2**2)); #Numerical aperture\n",
+ "\n",
+ "#Result\n",
+ "print \"The numerical aperture is\",round(NA,1)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The numerical aperture is 0.3\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.2, Page number 250"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "NA=0.5; #numerical aperture of fibre \n",
+ "n0=1; #refractive index of the medium(air)\n",
+ "\n",
+ "#Calculation \n",
+ "i=math.asin(NA/n0); #acceptance angle(radian)\n",
+ "i=i*180/math.pi; #angle(degrees)\n",
+ "\n",
+ "#Result\n",
+ "print \"The acceptance angle is\",i,\"degrees\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The acceptance angle is 30.0 degrees\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.3, Page number 250"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "NA=0.25; #numerical apperture\n",
+ "lamda=0.75; #wavelength(micro m)\n",
+ "a=25; #core radius(micro m)\n",
+ "\n",
+ "#Calculation \n",
+ "f=(2*math.pi*a*NA)/lamda; #normalised frequency\n",
+ "Ng=(f**2)/2; #number of guided modes\n",
+ "\n",
+ "#Result\n",
+ "print \"The number of guided modes is\",int(Ng)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The number of guided modes is 1370\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.4, Page number 250"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "pi=100; #mean optical power launched(micro m)\n",
+ "po=5; #mean optical power at fibre output(micro W)\n",
+ "l=6; #length(km)\n",
+ "\n",
+ "#Calculation \n",
+ "S=10*math.log10(pi/po); #signal attenuation(dB)\n",
+ "Sk=S/l; #signal attenuation(dB/km)\n",
+ "\n",
+ "#Result\n",
+ "print \"The signal attenuation is\",round(Sk,3),\"dB/km\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The signal attenuation is 2.168 dB/km\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.5, Page number 250"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "ns=2.89; #sum of refractive indices of core & cladding\n",
+ "nd=0.03; #difference of refractive indices of core & cladding\n",
+ "\n",
+ "#Calculation \n",
+ "NA=math.sqrt(ns*nd); #numerical apperture\n",
+ "\n",
+ "#Result\n",
+ "print \"The numerical apperture for the optical fibre is\",round(NA,2)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The numerical apperture for the optical fibre is 0.29\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.6, Page number 250"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "NA=0.28; #numerical aperture\n",
+ "a=30; #core radius(micro m)\n",
+ "lamda=0.8; #wavelength(micro m)\n",
+ "\n",
+ "#Calculation \n",
+ "f=(2*math.pi*a*NA)/lamda; #normalised frequency\n",
+ "Ng=f**2/2; #number of guided modes\n",
+ "\n",
+ "#Result\n",
+ "print \"The number of guided modes is\",int(Ng)\n",
+ "print \"answer in the book varies due to rounding off errors\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The number of guided modes is 2176\n",
+ "answer in the book varies due to rounding off errors\n"
+ ]
+ }
+ ],
+ "prompt_number": 14
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.7, Page number 250"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "S=2; #signal attenuation(dB/km)\n",
+ "l=1; #length(km)\n",
+ "p0=20; #mean optical power at fibre output(micro W)\n",
+ "\n",
+ "#Calculation \n",
+ "pi=p0*10**(S/10); #mean optical power launched into fibre(micro W)\n",
+ "\n",
+ "#Result\n",
+ "print \"The mean optical power launched into a fibre is\",round(pi,1),\"micro W\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The mean optical power launched into a fibre is 31.7 micro W\n"
+ ]
+ }
+ ],
+ "prompt_number": 16
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.8, Page number 251"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "S=2.3; #Signal attenuation(dB/km)\n",
+ "l=4; #length(km)\n",
+ "\n",
+ "#Calculation \n",
+ "S=S*l; #signal attenuation for 4km in dB\n",
+ "P=10**(S/10); #ratio of mean optical power\n",
+ "\n",
+ "#Result\n",
+ "print \"ratio of mean optical power is\",round(P,1)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "ratio of mean optical power is 8.3\n"
+ ]
+ }
+ ],
+ "prompt_number": 18
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 13.9, Page number 251"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "op=1/4; #ratio\n",
+ "\n",
+ "#Calculation \n",
+ "#S=10*log(pi/po)\n",
+ "S=10*math.log10(1/op); #signal attenuation(dB)\n",
+ "\n",
+ "#Result\n",
+ "print \"Signal attenuation is\",int(S),\"dB\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Signal attenuation is 6 dB\n"
+ ]
+ }
+ ],
+ "prompt_number": 20
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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