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diff --git a/Optical_Fiber_Communication_Principles_and_Practice/Chapter11_2.ipynb b/Optical_Fiber_Communication_Principles_and_Practice/Chapter11_2.ipynb
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--- a/Optical_Fiber_Communication_Principles_and_Practice/Chapter11_2.ipynb
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-{
- "metadata": {
-  "name": "Chapter_11"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": "Chapter 1 : Integrated optics and photonics"
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": "Example 11.1, page 624"
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": "import math\n\n#Variable declaration\nh=1.3*10**-6                            #wavlength\nd=25*10**-6                             #distance between the electrodes\nn1=2.1                                  #refractive index\nr=30.8*10**-12                          #electro-optic coefficient\nl=2*10**-2                              #length\n\n\n#Calculation\nV=(h*d)/(n1**3*r*l)                       #voltage\n\n#Result\nprint'Voltage = %.1f V'%V",
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": "Voltage = 5.7 V\n"
-      }
-     ],
-     "prompt_number": 1
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": "Example 11.2, page 629"
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": "import math\n\n#Variable declaration\nn1=3.1                                         #refractive index\nthet=1                                      #angle in degree\nh=1.52*10**-6                                  #wavelength\nl=10**-2                                         #length\n\n#Calculation\nne=n1*math.sin(2*thet*math.pi/180)             #effective refractive index\nD=h/(2*ne)                                     #Corrugation period\ns=D*h/l                                        #filter bandwidth\n\n\n#Result\nprint'Corrugation period = %.1f um'%(D*10**6)\nprint'Filter 3 dB bandwidth = %.1f \u00c5 '%(s*10**10)",
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": "Corrugation period = 7.0 um\nFilter 3 dB bandwidth = 10.7 \u00c5 \n"
-      }
-     ],
-     "prompt_number": 2
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file