From 6279fa19ac6e2a4087df2e6fe985430ecc2c2d5d Mon Sep 17 00:00:00 2001 From: kinitrupti Date: Fri, 12 May 2017 18:53:46 +0530 Subject: Removed duplicates --- .../5.FIBER_OPTICS.ipynb | 651 --------------------- 1 file changed, 651 deletions(-) delete mode 100755 backup/ENGINEERING_PHYSICS_by_M.ARUMUGAM_version_backup/5.FIBER_OPTICS.ipynb (limited to 'backup/ENGINEERING_PHYSICS_by_M.ARUMUGAM_version_backup/5.FIBER_OPTICS.ipynb') diff --git a/backup/ENGINEERING_PHYSICS_by_M.ARUMUGAM_version_backup/5.FIBER_OPTICS.ipynb b/backup/ENGINEERING_PHYSICS_by_M.ARUMUGAM_version_backup/5.FIBER_OPTICS.ipynb deleted file mode 100755 index 49cd3086..00000000 --- a/backup/ENGINEERING_PHYSICS_by_M.ARUMUGAM_version_backup/5.FIBER_OPTICS.ipynb +++ /dev/null @@ -1,651 +0,0 @@ -{ - "cells": [ - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "#Chapter 5:Fiber Optics" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.1, Page number 5.28" - ] - }, - { - "cell_type": "code", - "execution_count": 125, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "The Critical angle = 78.5 degrees\n", - "The numerical aperture = 0.3\n", - "The acceptance angle = 17.4 degrees\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "n1=1.50 #Core refractive index\n", - "n2=1.47 #Cladding refractive index\n", - "\n", - "#Calculations\n", - "C_a=math.asin(n2/n1) #Critical angle \n", - "N_a=(n1**2-n2**2)**(1/2)\n", - "A_a=math.asin(N_a)\n", - "\n", - "#Results\n", - "print \"The Critical angle =\",round(C_a*180/math.pi,1),\"degrees\"\n", - "print \"The numerical aperture =\",round(N_a,2)\n", - "print \"The acceptance angle =\",round(A_a*180/math.pi,1),\"degrees\"\n" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.2, Page number 5.28" - ] - }, - { - "cell_type": "code", - "execution_count": 126, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "N = 490.0\n", - "Fiber can support 490.0 guided modes\n", - "In graded index fiber, No.of modes propogated inside the fiber = 245.0 only\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "d=50 #diameter\n", - "N_a=0.2 #Numerical aperture\n", - "lamda=1 #wavelength\n", - "\n", - "#Calculations\n", - "N=4.9*(((d*10**-6*N_a)/(lamda*10**-6))**2)\n", - "\n", - "#Result\n", - "print \"N =\",N\n", - "print \"Fiber can support\",N,\"guided modes\"\n", - "print \"In graded index fiber, No.of modes propogated inside the fiber =\",N/2,\"only\"" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.3, Page number 5.29" - ] - }, - { - "cell_type": "code", - "execution_count": 1, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "Numerical aperture = 0.008691\n", - "No. of modes that can be propogated = 1.0\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "d=50 #diameter\n", - "n1=1.450\n", - "n2=1.447\n", - "lamda=1 #wavelength\n", - "\n", - "#Calculations\n", - "N_a=(n1**2-n2**2) #Numerical aperture\n", - "N=4.9*(((d*10**-6*N_a)/(lamda*10**-6))**2)\n", - "\n", - "#Results\n", - "print \"Numerical aperture =\",N_a\n", - "print \"No. of modes that can be propogated =\",round(N)" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.4, Page number 5.29" - ] - }, - { - "cell_type": "code", - "execution_count": 34, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "Numerical aperture = 0.46\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "delta=0.05 \n", - "n1=1.46\n", - "\n", - "#Calculation\n", - "N_a=n1*(2*delta)**(1/2) #Numerical aperture\n", - "\n", - "#Result\n", - "print \"Numerical aperture =\",round(N_a,2)" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.5, Page number 5.29" - ] - }, - { - "cell_type": "code", - "execution_count": 40, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "V number = 94.72\n", - "maximum no.of modes propogating through fiber = 4486.0\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "a=50\n", - "n1=1.53\n", - "n2=1.50\n", - "lamda=1 #wavelength\n", - "\n", - "#Calculations\n", - "N_a=(n1**2-n2**2) #Numerical aperture\n", - "V=((2*math.pi*a)/lamda)*N_a**(1/2)\n", - "\n", - "#Result\n", - "print \"V number =\",round(V,2)\n", - "print \"maximum no.of modes propogating through fiber =\",round(N)" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.6, Page number 5.29" - ] - }, - { - "cell_type": "code", - "execution_count": 64, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "Number of modes = 24589.0 modes\n", - "No.of modes is doubled to account for the two possible polarisations\n", - "Total No.of modes = 49178.0\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "a=100\n", - "N_a=0.3 #Numerical aperture\n", - "lamda=850 #wavelength\n", - "\n", - "#Calculations\n", - "V_n=(2*(math.pi)**2*a**2*10**-12*N_a**2)/lamda**2*10**-18\n", - "#Result\n", - "print \"Number of modes =\",round(V_n/10**-36),\"modes\"\n", - "print \"No.of modes is doubled to account for the two possible polarisations\"\n", - "print \"Total No.of modes =\",round(V_n/10**-36)*2\n" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.7, Page number 5.29" - ] - }, - { - "cell_type": "code", - "execution_count": 88, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "Cutoff Wavellength = 1.315 micro m.\n" - ] - } - ], - "source": [ - "import math\n", - "\n", - "#variable declaration\n", - "a=5;\n", - "n1=1.48;\n", - "delta=0.01;\n", - "V=25;\n", - "\n", - "#Calculation\n", - "lamda=(math.pi*(a*10**-6)*n1*math.sqrt(2*delta))/V # Cutoff Wavelength\n", - "\n", - "#Result\n", - "print \"Cutoff Wavellength =\",round(lamda*10**7,3),\"micro m.\"" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.8, Page number 5.30" - ] - }, - { - "cell_type": "code", - "execution_count": 87, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "Maximum core radius= 9.95 micro m\n" - ] - } - ], - "source": [ - "import math\n", - "\n", - "#variable declaration\n", - "V=2.405\n", - "lamda=1.3\n", - "N_a=0.05\n", - "\n", - "#Calculations\n", - "a_max=(V*lamda)/(2*math.pi*N_a)\n", - "\n", - "#Result\n", - "print \"Maximum core radius=\",round(a_max,2),\"micro m\"" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.9, Page number 5.30" - ] - }, - { - "cell_type": "code", - "execution_count": 2, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "Acceptance angle, theta_a = 17.46 degrees\n", - "For skew rays,theta_as 34.83 degrees\n", - "#Answer given in the textbook is wrong\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "N_a=0.3\n", - "gamma=45\n", - "\n", - "#Calculations\n", - "theta_a=math.asin(N_a)\n", - "theta_as=math.asin((N_a)/math.cos(gamma))\n", - "\n", - "#Results\n", - "print \"Acceptance angle, theta_a =\",round(theta_a*180/math.pi,2),\"degrees\"\n", - "print \"For skew rays,theta_as \",round(theta_as*180/math.pi,2),\"degrees\"\n", - "print\"#Answer given in the textbook is wrong\"" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.10, Page number 5.30" - ] - }, - { - "cell_type": "code", - "execution_count": 115, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "Numerical aperture = 0.303\n", - "Acceptance angle = 17.63 degrees\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "n1=1.53\n", - "delta=0.0196\n", - "\n", - "#Calculations\n", - "N_a=n1*(2*delta)**(1/2)\n", - "A_a=math.asin(N_a)\n", - "#Result\n", - "print \"Numerical aperture =\",round(N_a,3)\n", - "print \"Acceptance angle =\",round(A_a*180/math.pi,2),\"degrees\"" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.11, Page number 5.30" - ] - }, - { - "cell_type": "code", - "execution_count": 4, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "delta = 0.01\n", - "Core radius,a = 1.55 micro m\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "n1=1.480\n", - "n2=1.465\n", - "V=2.405\n", - "lamda=850*10**-9\n", - "\n", - "#Calculations\n", - "delta=(n1**2-n2**2)/(2*n1**2)\n", - "a=(V*lamda*10**-9)/(2*math.pi*n1*math.sqrt(2*delta))\n", - "\n", - "#Results\n", - "print \"delta =\",round(delta,2)\n", - "print \"Core radius,a =\",round(a*10**15,2),\"micro m\"" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.12, Page number 5.31" - ] - }, - { - "cell_type": "code", - "execution_count": 147, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - " Critical angle= 83.38 degrees\n", - "Fiber length covered in one reflection= 430.84 micro m\n", - "Total no.of reflections per metre= 2321.0\n", - "Since L=1m, Total dist. travelled by light over one metre of fiber = 1.0067 m\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "n1=1.5\n", - "n2=1.49\n", - "a=25\n", - "\n", - "#Calculations\n", - "C_a=math.asin(n2/n1) #Critical angle\n", - "L=2*a*math.tan(C_a) \n", - "N_r=10**6/L \n", - "\n", - "#Result\n", - "print \"Critical angle=\",round(C_a*180/math.pi,2),\"degrees\"\n", - "print \"Fiber length covered in one reflection=\",round(L,2),\"micro m\"\n", - "print \"Total no.of reflections per metre=\",round(N_r)\n", - "print \"Since L=1m, Total dist. travelled by light over one metre of fiber =\",round(1/math.sin(C_a),4),\"m\"" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.13, Page number 5.31" - ] - }, - { - "cell_type": "code", - "execution_count": 155, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "No.of modes = 154.69 =155(approx)\n", - "Taking the two possible polarizations, Total No.of nodes = 309.0\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "alpha=1.85\n", - "lamda=1.3*10**-6\n", - "a=25*10**-6\n", - "N_a=0.21\n", - "\n", - "#Calculations\n", - "V_n=((2*math.pi**2)*a**2*N_a**2)/lamda**2\n", - "N_m=(alpha/(alpha+2))*V_n\n", - "\n", - "print \"No.of modes =\",round(N_m,2),\"=155(approx)\"\n", - "print \"Taking the two possible polarizations, Total No.of nodes =\",round(N_m*2)" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.14, Page number 5.32" - ] - }, - { - "cell_type": "code", - "execution_count": 2, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "a)Signal attention per unit length = 3.9 dB km**-1\n", - "b)Overall signal attenuation = 39.0 dB\n", - "#Answer given in the textbook is wrong\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "P_i=100\n", - "P_o=2\n", - "L=10\n", - "\n", - "#Calculations\n", - "S=(10/L)*math.log(P_i/P_o)\n", - "O=S*L\n", - "\n", - "#Result\n", - "print \"a)Signal attention per unit length =\",round(S,1),\"dB km**-1\"\n", - "print \"b)Overall signal attenuation =\",round(O),\"dB\"\n", - "print \"#Answer given in the textbook is wrong\"" - ] - }, - { - "cell_type": "markdown", - "metadata": {}, - "source": [ - "##Example 5.15, Page number 5.32" - ] - }, - { - "cell_type": "code", - "execution_count": 1, - "metadata": { - "collapsed": false - }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "Total dispersion = 1343.3 ns\n", - "Bandwidth length product = 37.22 Hz-km\n", - "#Answer given in the text book is wrong\n" - ] - } - ], - "source": [ - "import math\n", - "from __future__ import division\n", - "\n", - "#variable declaration\n", - "L=10\n", - "n1=1.55\n", - "delta=0.026\n", - "C=3*10**5\n", - "\n", - "#Calculations\n", - "delta_T=(L*n1*delta)/C\n", - "B_W=10/(2*delta_T)\n", - "\n", - "#Result\n", - "print \"Total dispersion =\",round(delta_T/10**-9,1),\"ns\"\n", - "print \"Bandwidth length product =\",round(B_W/10**5,2),\"Hz-km\"\n", - "print \"#Answer given in the text book is wrong\"" - ] - } - ], - "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 -} -- cgit