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+{
+ "metadata": {
+  "celltoolbar": "Raw Cell Format",
+  "name": "",
+  "signature": "sha256:01140ffa208fb1ff4e49e5a80a5419f4194d3a8c5f0baf26d8febde3805a9450"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 4: Optical Detectors"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.1,Page number 99"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#given\n",
+      "\n",
+      "Tn=5;              #in micrometer\n",
+      "Vs=10**7;          #in m/s\n",
+      "tr=Tn*10**-6/Vs;\n",
+      "print\"Response time\",tr/10**-12,\"ps\";\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Response time 0.5 ps\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.2,Page number 106"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#given\n",
+      "\n",
+      "\n",
+      "Pd=1.15;            #in mW\n",
+      "\n",
+      "TA=25;              #in deg C\n",
+      "theta_JA=200;          #in C/W for hermetric led\n",
+      "TJ=TA+theta_JA*Pd/10**3;\n",
+      "TF=8.01*10**12 *math.e**-(8111/(TJ+273));\n",
+      "print\"Value of TJ is\" ,round(TJ,4), \"deg C\";\n",
+      "print\"Value of TF is\" ,round(TF,4), \"deg C\";\n",
+      "\n",
+      "BF=1.1*10**-3;               #from table\n",
+      "QF=0.5;                     #from table\n",
+      "EF=1;                       #from table\n",
+      "RF=BF*TF*EF*QF*1/10**6;\n",
+      "print\"Value of RF\",\"{0:.3e}\".format(RF);\n",
+      "print\"Value of MTBF is \",round(1/RF/10**6,4),\"*10^6 hours \\n\";"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Value of TJ is 25.23 deg C\n",
+        "Value of TF is 12.3614 deg C\n",
+        "Value of RF 6.799e-09\n",
+        "Value of MTBF is  147.0849 *10^6 hours \n",
+        "\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.3,Page number 114"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "\n",
+      "#given\n",
+      "\n",
+      "R1=0.7;\n",
+      "R2=0.99;\n",
+      "ad=0.1;\n",
+      "\n",
+      "Ld=1-R1*R2*math.e**-(2*ad);\n",
+      "print\"Decay Loss \",round(Ld,4);\n",
+      "trt=40;     #fs\n",
+      "tph=trt/Ld;\n",
+      "print\"Photon lifetime \",round(tph,4),\"fs\";\n",
+      "BW=1/tph;\n",
+      "print\"Bandwidth\",round(BW*1000,4) ,\"Thz\";  #Answer in Thz  \n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Decay Loss  0.4326\n",
+        "Photon lifetime  92.46 fs\n",
+        "Bandwidth 10.8155 Thz\n"
+       ]
+      }
+     ],
+     "prompt_number": 13
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file