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diff --git a/Fiber_Optics_and_Optoelectronics_by_R._P._Khare/Chapter12.ipynb b/Fiber_Optics_and_Optoelectronics_by_R._P._Khare/Chapter12.ipynb new file mode 100644 index 00000000..e76e4fcc --- /dev/null +++ b/Fiber_Optics_and_Optoelectronics_by_R._P._Khare/Chapter12.ipynb @@ -0,0 +1,259 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# Chapter12 - Fiber-optic communiation systems" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.1 : Page 299" + ] + }, + { + "cell_type": "code", + "execution_count": 1, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "maximum possible link length = 8.00 km\n", + "total rise time of the system in ns is 30.0\n" + ] + } + ], + "source": [ + "from __future__ import division\n", + "from math import sqrt, pi\n", + "#link length and reise time\n", + "af=2.5##dB/km\n", + "ac=0.5##dB/splice\n", + "nc=1##\n", + "lc=1##dB\n", + "ncc=2##\n", + "plx=-10##dBm\n", + "prx=-42##dBm\n", + "Ms=6##dB\n", + "L=((plx-prx-Ms-(lc*ncc))/(af+ac))##\n", + "TTX=12##NS\n", + "TRX=11##NS\n", + "NS1=3##NS/KM\n", + "NS2=1##NS/KM\n", + "tmat=(NS1*L)##ns\n", + "tint=(NS2*L)##ns\n", + "tsys=sqrt((TTX**2+tmat**2+tint**2+TRX**2))##ns\n", + "print\"maximum possible link length = %0.2f km\"% L\n", + "print \"total rise time of the system in ns is\",round(tsys)" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.2: Page 305" + ] + }, + { + "cell_type": "code", + "execution_count": 2, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "part (a)\n", + "maximum possible link length = 4.71 km\n", + "part (b)\n", + "system bandwidth = 8.00 MHz\n" + ] + } + ], + "source": [ + "## link length and bandwidth\n", + "print \"part (a)\"\n", + "af=3##dB/km\n", + "ac=0.5##dB/splice\n", + "nc=1##\n", + "lc=1##dB\n", + "ncc=1.5##\n", + "plx=0##dBm\n", + "prx=-25##dBm\n", + "Ms=7##dB\n", + "L=((plx-prx-Ms-(lc*ncc))/(af+ac))##\n", + "TTX=12##NS\n", + "TRX=11##NS\n", + "NS1=3##NS/KM\n", + "NS2=1##NS/KM\n", + "tmat=(NS1*L)##ns\n", + "tint=(NS2*L)##ns\n", + "tsys=sqrt((TTX**2+tmat**2+tint**2+TRX**2))##ns\n", + "print \"maximum possible link length = %0.2f km\"%L\n", + "print \"part (b)\"\n", + "af=3##dB/km\n", + "ac=0.5##dB/splice\n", + "nc=1##\n", + "lc=1##dB\n", + "ncc=1.5##\n", + "plx=-0##dBm\n", + "prx=-25##dBm\n", + "Ms=7##dB\n", + "L=((plx-prx-Ms-(lc*ncc))/(af+ac))##\n", + "TTX=1##NS\n", + "TRX=5##NS\n", + "NS1=9##NS/KM\n", + "NS2=2##NS/KM\n", + "tf=((NS1*L)**2+(NS2*L)**2)##\n", + "tsys=sqrt((TTX**2+tf+TRX**2))##ns\n", + "df=0.35/(tsys*10**-3)##\n", + "print \"system bandwidth = %0.2f MHz\"%round(df)" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.3 : Page 310" + ] + }, + { + "cell_type": "code", + "execution_count": 3, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "no. of subscribers are 38.0\n" + ] + } + ], + "source": [ + "from math import log10\n", + "#no. of subscribers\n", + "pt=1##mW\n", + "pn=-40##dBm\n", + "pn1=10**(pn/10)##\n", + "c=0.05##\n", + "d=0.11##\n", + "x=((pn1)/(pt*c))##\n", + "y=((log10(x))/(log10((1-d)*(1-c))))##\n", + "n=y+1##\n", + "print \"no. of subscribers are\",round(n)" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.4: Page 311" + ] + }, + { + "cell_type": "code", + "execution_count": 4, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Total power, P_tot = 92.4 mW\n" + ] + } + ], + "source": [ + "# Total power\n", + "#given data :\n", + "L_eff=20## in km\n", + "del_lamdaC=125## in nm\n", + "gR=6*10**-14## m/W\n", + "A_eff=55*10**-12## in m**2#\n", + "del_lamdaS=0.8## in nm\n", + "N=32## number of channels\n", + "F=0.1## constant\n", + "P_tot=(4*F*del_lamdaC*A_eff)/(gR*del_lamdaS*L_eff*(N-1))#\n", + "print \"Total power, P_tot = %0.1f mW\"%P_tot" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 12.5 : Page 312" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "SBS threshold power for the worst case = 8.66 mW\n", + "SBS threshold power for the best possible case = 17.33 mW\n" + ] + } + ], + "source": [ + "#SBS threshold power\n", + "#given data :\n", + "gb=4*10**-11## in m/W\n", + "A_eff=55*10**-12## in m**2\n", + "L_eff=20## in km\n", + "lamda_p=1.55## micro-m\n", + "n=1.46## constant\n", + "Va=5960## for the silica fiber in m-s**-1\n", + "Vb=(2*n*Va)/lamda_p#\n", + "del_v=100*10**6## in Hz\n", + "del_Vb=20*10**6## in Hz\n", + "b1=1#\n", + "b2=2#\n", + "P_th=((21*b1*A_eff)/(gb*L_eff))*(1+(del_v/del_Vb))\n", + "P_th1=((21*b2*A_eff)/(gb*L_eff))*(1+(del_v/del_Vb))\n", + "print \"SBS threshold power for the worst case = %0.2f mW\"%P_th\n", + "print \"SBS threshold power for the best possible case = %0.2f mW\"%P_th1" + ] + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 2", + "language": "python", + "name": "python2" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 2 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython2", + "version": "2.7.9" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} |