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diff --git a/Optical_Communication_by_Anasuya_Kalavar/chapter9.ipynb b/Optical_Communication_by_Anasuya_Kalavar/chapter9.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:c071b41323ac94460e204090d265021c7f2c7744a035dad84fc7193e1854e444"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "chapter9 - Link design"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9.4.1, page 9-8"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "output=13       #laser output\n",
+      "sensitivity=-31     #APD sensitivity\n",
+      "coupling_loss=0.5 \n",
+      "L=80    #length in km\n",
+      "sl=0.1  #loss correspond to one splice in dB\n",
+      "fl=0.35     #fiber loss in dB/km\n",
+      "noise=1.5 \n",
+      "allowed_loss=output-sensitivity \n",
+      "splices_loss=(L-1)*sl \n",
+      "fiber_loss=L*fl \n",
+      "margin=allowed_loss-(splices_loss+fiber_loss+coupling_loss+noise) \n",
+      "print \"Final margin is %.1f dB.\" %margin"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Final margin is 6.1 dB.\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 9.6.1, page 9-12"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from numpy import sqrt\n",
+      "L=10 \n",
+      "ts=10 \n",
+      "tD=8 \n",
+      "tmod=L*6 \n",
+      "tt=L*2 \n",
+      "Tsys=1.1*sqrt(ts**2+tmod**2+tt**2+tD**2) \n",
+      "Bt=0.7/Tsys \n",
+      "Bt=Bt*10**3 \n",
+      "print \"Maximum bit rate for link using NRZ data format is %.2f Mbits/sec.\" %Bt \n",
+      "#calculation error in the book."
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Maximum bit rate for link using NRZ data format is 9.86 Mbits/sec.\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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