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diff --git a/Fiber_Optics_Communication_by_H._Kolimbiris/chapter7_1.ipynb b/Fiber_Optics_Communication_by_H._Kolimbiris/chapter7_1.ipynb
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+{
+ "metadata": {
+  "celltoolbar": "Raw Cell Format",
+  "name": "",
+  "signature": "sha256:43cf13b531fcbbf3e0bcc8a424eeecc0242f15398c3e29eba296dbb99947d4d8"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 7: Optical Receivers"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 7.1,Page number 203"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#given\n",
+      "\n",
+      "Trec=54;            #in ns\n",
+      "Ttrans=40.0;          #in ns\n",
+      "Pwd=(Trec-Ttrans)/Ttrans*100;\n",
+      "\n",
+      "print\"PWD=\",Pwd,\"percent\";\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "PWD= 35.0 percent\n"
+       ]
+      }
+     ],
+     "prompt_number": 20
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 7.2,Page number 214"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#given\n",
+      "\n",
+      "#Vc=Vdin-Vdinq\n",
+      "Vc=5;                #in mV  Vdin-Vdinq=Vc\n",
+      "Irset =1.8*10**-3*(Vc*10**-3);     #in A\n",
+      "print\"Irset\",Irset*10**6,\"microA\";\n",
+      "Vs=1.5;              #Voltage at signal level below Vcc in V\n",
+      "Radj=Vs/Irset;                     #in Ohm\n",
+      "print\"Radj\",round(Radj*10**-3,4),\"kohm\";"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Irset 9.0 microA\n",
+        "Radj 166.6667 kohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 23
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 7.3,Page number 223"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#given\n",
+      "\n",
+      "Rl=50;      #in Ohm\n",
+      "Ro=100;     #in Ohm\n",
+      "Vos=450;            #in mV\n",
+      "Vref=(Rl+Ro)/Rl*Vos/2;\n",
+      "\n",
+      "print\"Vref= \",Vref,\"mV\";\n",
+      "\n",
+      "Vee=3.3;            #in V\n",
+      "R1=500;             #in Ohm\n",
+      "R2=16000.0;         #in Ohm\n",
+      "\n",
+      "#Rref=(Vee/Vref/10**3-1)*R1/(1-(R1/R2*(Vee/Vref/10**3-1)))\n",
+      "Rref=(((Vee/Vref)/(10**-3)-1)*R1)/((1-(R1/R2)*((Vee/Vref)/(10**-3)-1)));\n",
+      "print\"Rref= \",round(Rref,4),\"ohm\";\n",
+      "print\"Approx. Rref= \",round(Rref*10**-3,4),\"kohm\";\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Vref=  675 mV\n",
+        "Rref=  2213.4387 ohm\n",
+        "Approx. Rref=  2.2134 kohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 24
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file