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{
"metadata": {
"name": "",
"signature": "sha256:0e6d6451a42a64c2f14a17049d585a97e1d159d84d0a7abf55f333e84dfeeece"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"chapter10 - Performance measurement and monitoring"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10.5.1, page 10-24"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from numpy import sqrt\n",
"from __future__ import division\n",
"To=12.6 #width of output pulse\n",
"Ti=0.3 #width of input pulse\n",
"l=1.2 #length of measurement\n",
"Pulse_dispersion = sqrt(To**2 - Ti**2) #computing pulse dispersion\n",
"PDKM=Pulse_dispersion/l #computing pulse dispersion per Kilometer\n",
"BW=0.44/PDKM #computing optical bandwidth\n",
"BW=BW*1000 \n",
"print \"Pulse broadning is %.1f ns/km.\\nOptical bandwidth is %.1f MHz.Km.\" %(PDKM,BW) "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Pulse broadning is 10.5 ns/km.\n",
"Optical bandwidth is 41.9 MHz.Km.\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10.6.1, page 10-28"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from numpy import log10\n",
"V2=12 \n",
"V1=2.5 \n",
"L2=3 \n",
"L1=0.004 \n",
"alpha_dB = 10* log10(V2/V1)/(L2-L1) \n",
"un = 0.2/(L2-L1) \n",
"print \"Attenuation is %.2f dB/km\\nUncertainity +/- %.3f dB.\" %(alpha_dB,un) \n",
"#answer for attenuation in the book is wrong."
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Attenuation is 2.27 dB/km\n",
"Uncertainity +/- 0.067 dB.\n"
]
}
],
"prompt_number": 2
}
],
"metadata": {}
}
]
}
|
