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diff --git a/Optical_Fiber_Communication_Principles_and_Practice/Chapter4.ipynb b/Optical_Fiber_Communication_Principles_and_Practice/Chapter4.ipynb
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+{
+ "metadata": {
+  "name": "Chapter_4"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": "Chapter 4 : Optical fibers and cables"
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": "Example 4.1, page 196"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "import math\n\n#Variable declaration\nl=0.16*10**-9                                #bond distance\nSt=2.6*10**6                                 #cohesive strength\npsi=6894.76\nE=9*10**10                                   #Young modulus of silica\nC=10**-8\n\n#Calculation\nYp=4*l*St**2/E\nSf=math.sqrt((2*E*Yp)/(math.pi*C))            #Fracture stress for elliptical crack\nStr=Sf/E                                      #Strain\n\n#Result\nprint'Fracture stress for elliptical crack = %.2f x 10^5 psi'%(Sf*10**-5)\nprint'Strain in percentage = %d percent'%(Str*6894.76*100)",
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": "*"
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file