1 files changed, 128 insertions, 0 deletions
diff --git a/backup/temp_version_backup/chapter19.ipynb b/backup/temp_version_backup/chapter19.ipynb
new file mode 100755
index 00000000..1ce8f35e
--- /dev/null
+++ b/backup/temp_version_backup/chapter19.ipynb
@@ -0,0 +1,128 @@
+{
+ "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