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diff --git a/Optical_Fiber_Communication_Principles_and_Practice/Chapter13.ipynb b/Optical_Fiber_Communication_Principles_and_Practice/Chapter13.ipynb
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-{
- "metadata": {
-  "name": "Chapter_13"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": "Chapter 13: Optical fiber systems 2: coherent and phase-modulated"
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": "Example 13.1, page 832"
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": "#Variable declaration\nf1=150*10**6                            #reciever IF\nf2=19*10**9                             #output frequency change\n\n\n#Calculation\nm=f1*f2**-1                             #maximum tempreture change\n\n#Result\nprint'Maximum tempreture change = %d \u00d7 10^-3 \u00b0C '%round(m*10**3)",
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": "Maximum tempreture change = 8 \u00d7 10^-3 \u00b0C \n"
-      }
-     ],
-     "prompt_number": 5
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": "Example 13.2, page 834"
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": "import math\n\n#Variable declaration\np=-85.45/10\nn=0.86                                       #quantum efficiency\nh1=1.54*10**-6                               #homodyne receiver operating wavelength\nsn=10**-1.2                                  #SNR\nh=6.626*10**-34                             #plancks constant\nc=2.998*10**8                               #velocity of light\n\n\n#Calculation\nps=10**(p)                                 #incoming signal power in dB\nB=(n*ps*sn*h1)/(h*c)                       #Bandwidth\n\n#Result\nprint'Incoming signal power, Ps = %f nW'%(ps*10**9)\nprint'Operating bandwidth, B = %.1f GHz'%(B*10**-9)",
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": "Incoming signal power, Ps = 2.851018 nW\nOperating bandwidth, B = 1.2 GHz\n"
-      }
-     ],
-     "prompt_number": 1
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": "Example 13.3, page 878"
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": "#Variable declaration\npe=4.24                             #probability error function\npe2=20                              #probability exponential function\n\n\n#Calculation\nNp=pe**2*4                           #no of photons\nNp2=pe2*4\nNp3=pe**2/2\n\n#Result\nprint'(a) ASK heterodyne synchronous detection = %d photons'%round(Np)\nprint'(b) ASK heterodyne asynchronous detection = %d photons'%round(Np2)\nprint'(c) pSK homodyne  detection = %d photons'%round(Np3)",
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": "(a) ASK heterodyne synchronous detection = 72 photons\n(b) ASK heterodyne asynchronous detection = 80 photons\n(c) pSK homodyne  detection = 9 photons\n"
-      }
-     ],
-     "prompt_number": 8
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": "Example 13.4, page 881"
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": "import math\n\n#Variable declaration\nh1=6.626*10**-34                     #plancks constant\nc=2.998*10**8                        #speed of light\nBt=400*10**6                         #FSK signal bit rate\nh=1.55*10**-6                        #wavelength\n\n#Calculation\nps=(36*h1*c*Bt)/(h)                #optical power\n\n#Result\nprint'Minimum incoming optical power level = %.1f nW'%(ps*10**9)",
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": "Minimum incoming optical power level = 1.8 nW\n"
-      }
-     ],
-     "prompt_number": 16
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": "Example 13.5, page 883"
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": "import math\n\n#Variable declaration\nNp=36                                     #average photons\nNp2=9                                     #average photons\nh=6.63*10**-34                            #plancks constant\nf=3*10**8                                 #frequency\nBt=50*10**6                               #bit rates\nBt2=10**9                                 #bit rates\nh1=1.55*10**-6                            #operating wavelength\na=0.2                                     #connector loss\n\n\n#Calculation\nPs=Np*h*f*Bt/h1                           #in watt\nPs1=10*math.log10(Ps*10**3)               #in dB\nma=4-Ps1                                  #Max. system margin\nmar=ma/a                                  #Max. repeater spacing \n \nPs2=Np*h*f*Bt2/h1                         #in watt\nPs3=10*math.log10(Ps2*10**3)              #in dB\nma1=4-Ps3                                 #Max. system margin\nmar1=ma1/a                                #Max. repeater spacing \n\nPs4=Np2*h*f*Bt/h1                         #in watt\nPs5=10*math.log10(Ps4*10**3)              #in dB\nma2=4-Ps5                                 #Max. system margin\nmar2=ma2/a                                #Max. repeater spacing \n\nPs6=Np2*h*f*Bt2/h1                        #in watt\nPs7=10*math.log10(Ps6*10**3)              #in dB\nma3=4-Ps7                                 #Max. system margin\nmar3=ma3/a                                #Max. repeater spacing \n\n\n#Result\nprint'(a)Max. repeater spacing (50 Mbit s^-1) = %.1f km'%round(mar)\nprint'                         (1 Gbit s^-1) = %.1f km'%round(mar1)\nprint'\\n(b)Max. repeater spacing (50 Mbit s^-1) = %.1f km'%round(mar2)\nprint'                         (1 Gbit s^-1) = %.1f km'%round(mar3)",
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": "(a)Max. repeater spacing (50 Mbit s^-1) = 352.0 km\n                         (1 Gbit s^-1) = 287.0 km\n\n(b)Max. repeater spacing (50 Mbit s^-1) = 382.0 km\n                         (1 Gbit s^-1) = 317.0 km\n"
-      }
-     ],
-     "prompt_number": 37
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": "Example 13.6, page 888"
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": "import math\n\n#Variable declaration\nnp=150\nh1=6.626*10**-34                     #plancks constant\nc=2.998*10**8                        #speed of light\nbf=20*10**12                         #optical bandwidth\nh=1.3*10**-6                         #wavelength\n\n#Calculation\ntx=(np*h1*c*bf)/h                    #transmitter power\n\n#Result\nprint'Minimum transmitter power = %.1f mW' %(tx*1000)",
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": "Minimum transmitter power = 0.5 mW\n"
-      }
-     ],
-     "prompt_number": 26
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
\ No newline at end of file