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diff --git a/backup/Optical_Communiation_by_Anasuya_Kalavar_version_backup/chapter1.ipynb b/backup/Optical_Communiation_by_Anasuya_Kalavar_version_backup/chapter1.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:985ad452c65fa6c321f3f5a416b2ee95d94eb6cba2ef0da1eac4d7b73a848422"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "chapter1 - Overview of optical fiber communications"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1.6.1, page 1-15"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "Bit_rate = 2*10**9       # bit rate of channel\n",
+      "# Given sequence is 010111101110\n",
+      "Shortest_duration = 1*(1/Bit_rate)      # shortest duration is '1'\n",
+      "Widest_duration = 4*(1/Bit_rate)      #widest duration is '1111'\n",
+      "Shortest_duration = Shortest_duration        # seconds\n",
+      "Widest_duration = Widest_duration      # seconds\n",
+      "print \"Shortest duration is %.1g seconds.\" %Shortest_duration\n",
+      "print \"Widest duration is %.1g seconds.\" %Widest_duration"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Shortest duration is 5e-10 seconds.\n",
+        "Widest duration is 2e-09 seconds.\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1.12.1, page 1-28"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "from numpy import log2\n",
+      "Bandwidth = 2*10**6      #Bandwidth of channel\n",
+      "Signal_to_Noise_ratio = 1               #Signal to Noise ratio of channel\n",
+      "Capacity = Bandwidth * log2(1 + Signal_to_Noise_ratio)  #computing capacity\n",
+      "Capacity=Capacity/10**6 \n",
+      "print \"Maximum capacity of channel is %d Mb/sec.\" %Capacity"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Maximum capacity of channel is 2 Mb/sec.\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Question 10, page 1-31"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "Bit_rate = 2*10**9       # bit rate of channel\n",
+      "# Given sequence is 010111101110\n",
+      "Shortest_duration = 1*(1/Bit_rate)      # shortest duration is '1'\n",
+      "Widest_duration = 4*(1/Bit_rate)      #widest duration is '1111'\n",
+      "Shortest_duration = Shortest_duration        # seconds\n",
+      "Widest_duration = Widest_duration      # seconds\n",
+      "print \"Shortest duration is %.1g seconds.\" %Shortest_duration\n",
+      "print \"Widest duration is %.1g seconds.\" %Widest_duration"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Shortest duration is 5e-10 seconds.\n",
+        "Widest duration is 2e-09 seconds.\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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