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Diffstat (limited to 'Optical_fiber_communication_by_gerd_keiser/chapter8.ipynb')
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diff --git a/Optical_fiber_communication_by_gerd_keiser/chapter8.ipynb b/Optical_fiber_communication_by_gerd_keiser/chapter8.ipynb new file mode 100755 index 00000000..7624efd8 --- /dev/null +++ b/Optical_fiber_communication_by_gerd_keiser/chapter8.ipynb @@ -0,0 +1,335 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:c41fce225679ac457a37b8135a3b4343e35e5bc26e64b35427fb89f090d39c55"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chepter 8: Digital links"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.1, Page Number: 287"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#variable declaration\n",
+ "system_margin = 6 # (dB)\n",
+ "alpha = 3.5 #attenuation (dB/Km)\n",
+ "L =6 #Length of transmission path (Km)\n",
+ "lc = 1 #connector loss (dB)\n",
+ "\n",
+ "#calculation\n",
+ "PT = 2*lc+alpha*L+system_margin #total optical power loss(dB)\n",
+ "\n",
+ "#result\n",
+ "print \"Total optical power loss = \" , round(PT) ,\"dB\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Total optical power loss = 29.0 dB\n"
+ ]
+ }
+ ],
+ "prompt_number": 34
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.2, Page Number: 288"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#variable declaration\n",
+ "Ps = 3 #laser output (dBm)\n",
+ "APD_sen = -32 #APD sensitivity (dBm)\n",
+ "lsc = 1 #source connectorloss (dB)\n",
+ "ljc = 2*4 #two (jumper+connector loss) (dB)\n",
+ "alpha = 0.3 #attenuation (dB/Km)\n",
+ "L = 60 #cable length (Km)\n",
+ "cable_att = alpha*60 #cable attenuation (dB)\n",
+ "lrc = 1 #receiver connector loss (dB)\n",
+ "\n",
+ "#calculation\n",
+ "Allowed_Loss = Ps-APD_sen # (dB)\n",
+ "system_margin = Allowed_Loss-lsc-ljc-cable_att-lrc #system margin(dB)\n",
+ "\n",
+ "#result\n",
+ "print \"Allowed loss between light source and photodetector = \",Allowed_Loss,\"dB\"\n",
+ "print \"The Final power margin = \" , round(system_margin) , \"dB\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Allowed loss between light source and photodetector = 35 dB\n",
+ "The Final power margin = 7.0 dB\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.3, Page Number: 291"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#variable declaration\n",
+ "t_tx = 15*10**-9 #transmitter rise time(ns)\n",
+ "t_mat = 21*10**-9 #material dispersion related rise time(ns)\n",
+ "t_mod = 3.9*10**-9 #rise time resulting from modal dispersion(ns)\n",
+ "t_rx = 14*10**-9 #receiver rise time(ns)\n",
+ "\n",
+ "#calculation\n",
+ "tsys = math.sqrt(t_tx**2+t_mat**2+t_mod**2+t_rx**2) #link rise time(ns)\n",
+ "\n",
+ "#result\n",
+ "print \"Link rise time = \" , round(tsys*10**9),\"ns\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Link rise time = 30.0 ns\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.4, Page Number: 292"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#variable declaration\n",
+ "t_tx = 25*10**-12 #transmission rise time (sec)\n",
+ "t_GVD = 12*10**-12 #GVD rise time (sec)\n",
+ "t_rx = 0.14*10**-9 #receiver rise time (sec)\n",
+ "\n",
+ "#calculation\n",
+ "tsys = math.sqrt(t_tx**2+t_GVD**2+t_rx**2) #Link rise time(ns)\n",
+ "\n",
+ "#result\n",
+ "print \"System rise time = \" , round(tsys*10**9,2) , \"ns\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "System rise time = 0.14 ns\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.5, Page Number: 306"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#variable declaration\n",
+ "bit_error_dur = 1*10**-3 #bit-corrupting burst noise duration (ms)\n",
+ "B = 10*10**3 #data rate (kb/sec)\n",
+ "\n",
+ "#calculation\n",
+ "N = B*bit_error_dur #number of bits affected by by burst error (MB/s)\n",
+ "\n",
+ "#result\n",
+ "print \"Number of bits affected by a burst error = \" , round(N) , \"Mb/s\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Number of bits affected by a burst error = 10.0 Mb/s\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.6, Page Number: 308"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#variable declaration\n",
+ "x=1\n",
+ "\n",
+ "#calculation\n",
+ "polynomial = str(x**7)+\"0\"+str(x**5)+\"0\"+\"0\"+str(x**2)+str(x)+\"1\" #generator polynommial\n",
+ "\n",
+ "#result\n",
+ "print \"The generator polynomial to 8-bit binary represantation = \",polynomial"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The generator polynomial to 8-bit binary represantation = 10100111\n"
+ ]
+ }
+ ],
+ "prompt_number": 39
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.8, Page Number: 309"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#variable declaration\n",
+ "N = 32.0 #number of CRC\n",
+ "\n",
+ "#calculation\n",
+ "Ped = 1.0-(1.0/(2.0**N)) #burst error\n",
+ "\n",
+ "#result\n",
+ "print \"Burst error detected by CRC = \" , round(Ped*100,8), \"%\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Burst error detected by CRC = 99.99999998 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.9, Page Number: 309"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#variable declaration\n",
+ "S = 8 #Reed-Solomon code with 1 byte\n",
+ "n = (2**S-1) #length of coded sequence\n",
+ "k = 239.0 #length of message sequence\n",
+ "\n",
+ "#calculation\n",
+ "r = n-k #number of redundent bytes\n",
+ "over_head = (r/k) #overhead %\n",
+ "\n",
+ "#result\n",
+ "print \"Number of redundent bytes r = \" ,round(r),\"bytes\"\n",
+ "print \"Percent overhead = \" , round(over_head*100) , \"%\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Number of redundent bytes r = 16.0 bytes\n",
+ "Percent overhead = 7.0 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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