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diff --git a/Electronic_Communication_Systems_by_Roy_Blake/Chapter25.ipynb b/Electronic_Communication_Systems_by_Roy_Blake/Chapter25.ipynb new file mode 100644 index 00000000..00dafb1b --- /dev/null +++ b/Electronic_Communication_Systems_by_Roy_Blake/Chapter25.ipynb @@ -0,0 +1,245 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# Chapter 25 : Fiber Optic Systems" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 1 : pg 919" + ] + }, + { + "cell_type": "code", + "execution_count": 1, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The system margin is 7.011 dB\n" + ] + } + ], + "source": [ + " \n", + "# page no 919\n", + "# prob no 25_1\n", + "#calculate the system margin\n", + "#given\n", + "from math import log10\n", + "span_length = 40#in km\n", + "Pin_mW = 1.5\n", + "signal_strength_dBm = -25\n", + "fiber_length = 2.5#in km\n", + "loss_per_slice_dB = 0.25\n", + "f_loss_dB_per_km = 0.3\n", + "loss_connector_dB = 4\n", + "#calculations\n", + "Pin_dBm = 10 * log10(Pin_mW)\n", + "splices = span_length / fiber_length - 1\n", + "fiber_loss = span_length * f_loss_dB_per_km\n", + "splice_loss = splices * loss_per_slice_dB\n", + "T_loss = fiber_loss + splice_loss + loss_connector_dB\n", + "P_out = Pin_dBm - T_loss\n", + "sys_margin = P_out - signal_strength_dBm\n", + "#results\n", + "print 'The system margin is',round(sys_margin,3),'dB'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 2 : pg 921" + ] + }, + { + "cell_type": "code", + "execution_count": 2, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The maximum permissible value for the pulse-spreading constant is 2.22 ns/km\n" + ] + } + ], + "source": [ + " \n", + "# page no 921\n", + "# prob no 25_2\n", + "#calculate the max permissible value\n", + "#given\n", + "L=45;#in km\n", + "dt=100.;#in ns\n", + "#calculations\n", + "#The maximum permissible value for the pulse-spreading constant is \n", + "D=dt/L;\n", + "#results\n", + "print 'The maximum permissible value for the pulse-spreading constant is',round(D,2),'ns/km'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 3 : pg 922" + ] + }, + { + "cell_type": "code", + "execution_count": 3, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "a) The maximum bit rate for NRZ 0.00743 GHz\n", + "b) The maximum bit rate for NRZ 0.00371 GHz\n" + ] + } + ], + "source": [ + " \n", + "# page no 922\n", + "# prob no 25_3\n", + "#calculate the max bitrate in both cases#given\n", + "#given\n", + "from math import sqrt\n", + "L=45.;\n", + "T_Rtx=50.; T_Rrx=75.; T_Rf=100.;\n", + "#calculations and results\n", + "T_RT=sqrt(T_Rtx**2 + T_Rrx**2 + T_Rf**2);\n", + "# a) for NRZ\n", + "fb=1/T_RT;\n", + "print 'a) The maximum bit rate for NRZ',round(fb,5),'GHz'\n", + "# b) for RZ\n", + "fb=1/(2*T_RT);\n", + "print 'b) The maximum bit rate for NRZ',round(fb,5),'GHz'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 4 : pg 924" + ] + }, + { + "cell_type": "code", + "execution_count": 4, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Dispersion is 1.0 ns/km\n", + "Total rise time is 5.0 ns\n" + ] + } + ], + "source": [ + " \n", + "# page no 924\n", + "# prob no 25_4\n", + "#calculate the total rise time and dispersion\n", + "#given\n", + "Bl=500.;#in MHz-km\n", + "L=5.;#in km\n", + "#calculations and results\n", + "# using the bandwidth-distance product formula dispersion is given as\n", + "D=500/Bl;\n", + "print 'Dispersion is',D,'ns/km'\n", + "# Total rise time is given as\n", + "T_rt= D*L;\n", + "print 'Total rise time is',T_rt,'ns'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 5 : pg 924" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "The maximum acceptable dispersion is 0.139 ns/km\n", + "The bandwidth-distance product is 3608.439 MHz-km\n" + ] + } + ], + "source": [ + " \n", + "# page no 924\n", + "# prob no 25_5\n", + "#calculate the max acceptable dispersion and bandwidth-distance product\n", + "#given\n", + "from math import sqrt\n", + "T_Rrx=3.*10**-9;\n", + "T_Rtx=2.*10**-9;\n", + "fb=100.*10**6;#in bps\n", + "L=25;#in km\n", + "#calculations and results\n", + "T_RT = 1/(2*fb)\n", + "# we have to compute rise time therefore\n", + "T_rf= sqrt(T_RT**2 - T_Rtx**2 - T_Rrx**2)\n", + "# dispersion per km is\n", + "D= T_rf/L;\n", + "print 'The maximum acceptable dispersion is',round(D/10**-9,3),'ns/km'\n", + "# using the bandwidth-distance product\n", + "Bl=500/D;\n", + "print 'The bandwidth-distance product is',round(Bl*10**-9,3),'MHz-km'" + ] + } + ], + "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": "2.7.11" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} |