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diff --git a/backup/Engineering_Physics_by_P.K.Palanisamy_version_backup/Chapter13.ipynb b/backup/Engineering_Physics_by_P.K.Palanisamy_version_backup/Chapter13.ipynb new file mode 100755 index 00000000..fa599112 --- /dev/null +++ b/backup/Engineering_Physics_by_P.K.Palanisamy_version_backup/Chapter13.ipynb @@ -0,0 +1,274 @@ +{
+ "cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "#13: Fiber Optics "
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 13.1, Page number 13.5"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 2,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "numerical aperture is 0.391\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "n1=1.55; #refractive index of core\n",
+ "n2=1.50; #refractive index of cladding\n",
+ "\n",
+ "#Calculation\n",
+ "NA=math.sqrt(n1**2-n2**2); #numerical aperture\n",
+ "\n",
+ "#Result\n",
+ "print \"numerical aperture is\",round(NA,3)"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 13.2, Page number 13.6"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 8,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "angle of acceptance is 26 degrees 29.5 minutes\n",
+ "answer varies due to rounding off errors\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "n1=1.563; #refractive index of core\n",
+ "n2=1.498; #refractive index of cladding\n",
+ "\n",
+ "#Calculation\n",
+ "NA=math.sqrt(n1**2-n2**2); #numerical aperture\n",
+ "alpha_i=math.asin(NA); #angle of acceptance(radian)\n",
+ "alpha_i=(alpha_i*180/math.pi); #angle(degrees)\n",
+ "alpha_id=int(alpha_i);\n",
+ "alpha_im=60*(alpha_i-alpha_id);\n",
+ "\n",
+ "#Result\n",
+ "print \"angle of acceptance is\",alpha_id,\"degrees\",round(alpha_im,1),\"minutes\"\n",
+ "print \"answer varies due to rounding off errors\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 13.3, Page number 13.6"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 13,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "refractive index of core is 1.2333\n",
+ "answer varies due to rounding off errors\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "NA=0.39; #numerical aperture\n",
+ "delta=0.05; #difference of indices\n",
+ "\n",
+ "#Calculation\n",
+ "n1=NA/math.sqrt(2*delta); #refractive index of core\n",
+ "\n",
+ "#Result\n",
+ "print \"refractive index of core is\",round(n1,4)\n",
+ "print \"answer varies due to rounding off errors\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 13.4, Page number 13.7"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 15,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "fractional index change is 0.0416\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "n1=1.563; #refractive index of core\n",
+ "n2=1.498; #refractive index of cladding\n",
+ "\n",
+ "#Calculation\n",
+ "delta=(n1-n2)/n1; #fractional index change\n",
+ "\n",
+ "#Result\n",
+ "print \"fractional index change is\",round(delta,4)"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 13.5, Page number 13.7"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 19,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "numerical aperture is 0.2965\n",
+ "angle of acceptance is 17 degrees 15.0 minutes\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "n1=1.48; #refractive index of core\n",
+ "n2=1.45; #refractive index of cladding\n",
+ "\n",
+ "#Calculation\n",
+ "NA=math.sqrt(n1**2-n2**2); #numerical aperture\n",
+ "alpha_i=math.asin(NA); #angle of acceptance(radian)\n",
+ "alpha_i=(alpha_i*180/math.pi); #angle(degrees)\n",
+ "alpha_id=int(alpha_i);\n",
+ "alpha_im=60*(alpha_i-alpha_id);\n",
+ "\n",
+ "#Result\n",
+ "print \"numerical aperture is\",round(NA,4)\n",
+ "print \"angle of acceptance is\",alpha_id,\"degrees\",round(alpha_im),\"minutes\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 13.6, Page number 13.14"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 22,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "attenuation loss is 3.98 dB\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "Pout=40; #power(mW)\n",
+ "Pin=100; #power(mW)\n",
+ "\n",
+ "#Calculation\n",
+ "al=-10*math.log10(Pout/Pin); #attenuation loss(dB)\n",
+ "\n",
+ "#Result\n",
+ "print \"attenuation loss is\",round(al,2),\"dB\""
+ ]
+ }
+ ],
+ "metadata": {
+ "kernelspec": {
+ "display_name": "Python 2",
+ "language": "python",
+ "name": "python2"
+ },
+ "language_info": {
+ "codemirror_mode": {
+ "name": "ipython",
+ "version": 2
+ },
+ "file_extension": ".py",
+ "mimetype": "text/x-python",
+ "name": "python",
+ "nbconvert_exporter": "python",
+ "pygments_lexer": "ipython2",
+ "version": "2.7.9"
+ }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
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