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diff --git a/backup/Optical_Communiation_by_Anasuya_Kalavar_version_backup/chapter6.ipynb b/backup/Optical_Communiation_by_Anasuya_Kalavar_version_backup/chapter6.ipynb new file mode 100755 index 00000000..2383415f --- /dev/null +++ b/backup/Optical_Communiation_by_Anasuya_Kalavar_version_backup/chapter6.ipynb @@ -0,0 +1,252 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:1a1f7133700fa452f49cfaeb319a776f69d7e64235d3f11f1abd2825b262e6e8" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "chapter6 - Optical sources" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.3.1, page 6-7 " + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from __future__ import division\n", + "x=0.07 \n", + "Eg=1.424+1.266*x+0.266*x**2 \n", + "lamda=1.24/Eg #computing wavelength\n", + "print \"Wavlength is %.3f micrometer.\" %lamda " + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Wavlength is 0.819 micrometer.\n" + ] + } + ], + "prompt_number": 7 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.3.2, page 6.12" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "n=1.7 #refractive index\n", + "L=5*10**-2 #distance between mirror\n", + "c=3*10**8 #speed of light\n", + "lamda=0.45*10**-6 #wavelength\n", + "k=2*n*L/lamda #computing number of modes\n", + "delf=c/(2*n*L) #computing mode separation\n", + "delf=delf*10**-9 \n", + "print \"Number of modes are %.2e.\\nFrequency separation is %.2f GHz.\"%(k,delf) " + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Number of modes are 3.78e+05.\n", + "Frequency separation is 1.76 GHz.\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.7.1, page 6-26" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from __future__ import division\n", + "tr=50 #radiative recombination lifetime\n", + "tnr=85 #non-radiative recombination lifetime\n", + "h=6.624*10**-34 #plank's constant\n", + "c=3*10**8 #speed of light\n", + "q=1.6*10**-19 #charge of electron\n", + "i=35*10**-3 #current\n", + "lamda=0.85*10**-6 #wavelength\n", + "t=tr*tnr/(tr+tnr) #computing total recombination time\n", + "eta=t/tr #computing internal quantum efficiency\n", + "Pint=eta*h*c*i/(q*lamda) #computing internally generated power\n", + "Pint=Pint*10**3\n", + "print \"Total recombinaiton time is %.2f ns.\\nInternal quantum efficiency is %.3f.\\nInternally generated power is %.2f mW.\" %(t,eta,Pint) \n", + "#answer in the book for Internal quantum efficiency & Internally generated power is wrong." + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Total recombinaiton time is 31.48 ns.\n", + "Internal quantum efficiency is 0.630.\n", + "Internally generated power is 32.20 mW.\n" + ] + } + ], + "prompt_number": 6 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.8.1, page 6-34" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from numpy import sqrt, pi\n", + "f1=10*10**6 #frequency\n", + "f2=100*10**6\n", + "t=4*10**-9 \n", + "Pdc=280*10**-6 #optincal output power\n", + "w1=2*pi*f1 #computing omega\n", + "Pout1=Pdc*10**6/(sqrt(1+(w1*t)**2)) #computing output power\n", + "w2=2*pi*f2 #computing omega\n", + "Pout2=Pdc*10**6/(sqrt(1+(w2*t)**2)) #computing output power\n", + "print \"\"\"Ouput power at 10 MHz is %.2f microwatt.\n", + "Ouput power at 100 MHz is %.2f microwatt.\n", + "Conclusion when device is drive at higher frequency the optical power reduces.\"\"\" %(Pout1,Pout2) \n", + "BWopt = sqrt(3)/(2*pi*t) \n", + "BWelec = BWopt/sqrt(2) \n", + "BWopt=BWopt*10**-6 \n", + "BWelec=BWelec*10**-6 \n", + "print \"3 dB optical power is %.2f MHz.\\n3 dB electrical power is %.2f MHz.\" %(BWopt,BWelec) \n", + "#calculation error. In the book square term in the denominater is not taken.\n", + "#answers in the book are wrong." + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Ouput power at 10 MHz is 271.55 microwatt.\n", + "Ouput power at 100 MHz is 103.52 microwatt.\n", + "Conclusion when device is drive at higher frequency the optical power reduces.\n", + "3 dB optical power is 68.92 MHz.\n", + "3 dB electrical power is 48.73 MHz.\n" + ] + } + ], + "prompt_number": 8 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.8.2, page 6-35" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "n1=3.5 #refractive index\n", + "n=1 #refractive index of air\n", + "F=0.69 #transmission factor\n", + "eta = 100*(n1*(n1+1)**2)**-1 #computing eta\n", + "print \"eta external is %.1f percent i.e. small fraction of intrnally generated opticalpower is emitted from the device.\" %eta \n", + "r= 100*F*n**2/(4*n1**2) #computing ratio of Popt/Pint\n", + "print \"Popt/Pint is %.1f percent\" %r\n", + "#printing mistake at final answer." + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "eta external is 1.4 percent i.e. small fraction of intrnally generated opticalpower is emitted from the device.\n", + "Popt/Pint is 1.4 percent\n" + ] + } + ], + "prompt_number": 9 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.8.3, page 6-39" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from numpy import log, exp\n", + "beta0=1.85*10**7 \n", + "T=293 #temperature\n", + "k=1.38*10**-23 #Boltzman constant\n", + "Ea=0.9*1.6*10**-19 \n", + "theta=0.65 #thershold\n", + "betar=beta0*exp(-Ea/(k*T)) \n", + "t=-log(theta)/betar \n", + "print \"Degradation rate is %.1e per hour.\\nOperating lifetime is %.1e hour.\" %(betar,t) \n", + "#answer in the book for Degradation rate & Operating lifetime is wrong." + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Degradation rate is 6.3e-09 per hour.\n", + "Operating lifetime is 6.8e+07 hour.\n" + ] + } + ], + "prompt_number": 12 + } + ], + "metadata": {} + } + ] +}
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