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--- a/Principles_Of_Electronic_Communication_Systems/chapter19.ipynb
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@@ -1,128 +0,0 @@
-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:bbbebe541ba21d9bbb4d54500aef67ec9a094ac72f21cf0a19a14aa93b9c61ce"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter 19 Optical communication"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 19.1 Page no 760"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#Given\n",
-      "NA = 0.29\n",
-      "\n",
-      "#Calculation\n",
-      "import math\n",
-      "critical_angle = math.asin(0.29)*180/3.14\n",
-      "\n",
-      "print\"The critical angle is \",round(critical_angle,2),\"degree\"\n",
-      " \n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "The critical angle is  16.87 degree\n"
-       ]
-      }
-     ],
-     "prompt_number": 3
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 19.2 Page no 767"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#Given\n",
-      "B_rating_Mhzkm =600*10**6\n",
-      "len_ft=500\n",
-      "\n",
-      "#Calculation\n",
-      "bandwidth = B_rating_Mhzkm/(len_ft/3274.0)\n",
-      "\n",
-      "#Result\n",
-      "print\"The bandwidth of the 500 feetr segment of the cable is \",bandwidth/10**6,\"MHz\"\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "The bandwidth of the 500 feetr segment of the ccable is  3928.8 MHz\n"
-       ]
-      }
-     ],
-     "prompt_number": 2
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 19.3 Page no 780"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#Given\n",
-      "R=43*10**6\n",
-      "D=1200/3274.0\n",
-      "\n",
-      "#Calculation\n",
-      "d=1/(5.0*R*D)\n",
-      "\n",
-      "#Result\n",
-      "print\"The dispersion factor is \",round(d*10**9,1),\"ns/km\"\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "The dispersion factor is  12.7 ns/km\n"
-       ]
-      }
-     ],
-     "prompt_number": 4
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file