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diff --git a/Fiber_Optics_and_Optoelectronics_by_R_P_Khare/11-Wavelength_division_multiplexing.ipynb b/Fiber_Optics_and_Optoelectronics_by_R_P_Khare/11-Wavelength_division_multiplexing.ipynb
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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 11: Wavelength division multiplexing"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 11.1: interaction_length.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 11.1:interaction length \n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"format('v',6)\n",
+"po=1;//assume\n",
+"p1=po/2;//\n",
+"p2=p1;//\n",
+"kl=asin(sqrt(p1));//in degree\n",
+"disp(kl,'interaction length is')\n",
+"//answer is in the form of pi in the textbook"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 11.2: position_of_the_output_ports.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 11.2:position \n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"a=8.2;//in micro meter\n",
+"n1=1.45;//\n",
+"n2=1.446;//\n",
+"h1=1.31;//in micro meter\n",
+"h2=1.55;///in micro meter\n",
+"v1=((2*%pi*a*sqrt(n1^2-n2^2))/h1);//\n",
+"v2=((2*%pi*a*sqrt(n1^2-n2^2))/h2);//\n",
+"db=2.439;//\n",
+"del=5.5096*10^-3;//\n",
+"k1=1.0483;//mm^-1;//\n",
+"k2=1.2839///m^-1\n",
+"l1=((%pi)/(4*k1));//in mm\n",
+"l2=((%pi)/(4*k2));//in mm\n",
+"disp('output port positioned at '+string(l2)+' mm with respect to the input port will gather signals at h1=1310nm')\n",
+"disp('output port positioned at '+string(l1)+' mm with respect to the input port will gather signals at h1=1550nm')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 11.4: order.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 11.4: ARRAYED GUIDE\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"//given data :\n",
+"c=3*10^8;\n",
+"lamda_c=1.55*10^-6;// in m\n",
+"vc=c/lamda_c;\n",
+"n=16;// number of channel\n",
+"f=100*10^9;// in Hz\n",
+"delV_FSR=n*f;\n",
+"m=round(vc/delV_FSR);\n",
+"disp(m,'required order of the arrayed waveguide, = ')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}