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diff --git a/Fiber_Optics_Communication_by_H._Kolimbiris/chapter5.ipynb b/Fiber_Optics_Communication_by_H._Kolimbiris/chapter5.ipynb
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@@ -0,0 +1,101 @@
+{
+ "metadata": {
+  "celltoolbar": "Raw Cell Format",
+  "name": "",
+  "signature": "sha256:a2b560d73b954e9a1c7f8ed18b2499b5355c9c4b506d0daba4c1031f93d49041"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 5: Optical Amplifiers"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 5.1,Page number 128"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#given\n",
+      "\n",
+      "Vrms=0.3;       #in V\n",
+      "CF=0.75;        #in V/mW\n",
+      "Pi=Vrms/CF;         \n",
+      "print\" input power \",round(Pi,4),\"mW\";"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " input power  0.4 mW\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 5.2,Page number 131"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#given\n",
+      "\n",
+      "Di=155;         #in Mb/s\n",
+      "sl=10**-3*Di*10**6;           #in  bitstream\n",
+      "#PRBS=2**x-1=sl;\n",
+      "x=log(sl+1)/log(2);           #equation is made to pick value of x\n",
+      "print\" PRBS =(2^\",int(x),\")-1\";\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " PRBS =(2^ 17 )-1\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file