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{
"metadata": {
"name": "",
"signature": "sha256:c071b41323ac94460e204090d265021c7f2c7744a035dad84fc7193e1854e444"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"chapter9 - Link design"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9.4.1, page 9-8"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"output=13 #laser output\n",
"sensitivity=-31 #APD sensitivity\n",
"coupling_loss=0.5 \n",
"L=80 #length in km\n",
"sl=0.1 #loss correspond to one splice in dB\n",
"fl=0.35 #fiber loss in dB/km\n",
"noise=1.5 \n",
"allowed_loss=output-sensitivity \n",
"splices_loss=(L-1)*sl \n",
"fiber_loss=L*fl \n",
"margin=allowed_loss-(splices_loss+fiber_loss+coupling_loss+noise) \n",
"print \"Final margin is %.1f dB.\" %margin"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Final margin is 6.1 dB.\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9.6.1, page 9-12"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from numpy import sqrt\n",
"L=10 \n",
"ts=10 \n",
"tD=8 \n",
"tmod=L*6 \n",
"tt=L*2 \n",
"Tsys=1.1*sqrt(ts**2+tmod**2+tt**2+tD**2) \n",
"Bt=0.7/Tsys \n",
"Bt=Bt*10**3 \n",
"print \"Maximum bit rate for link using NRZ data format is %.2f Mbits/sec.\" %Bt \n",
"#calculation error in the book."
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Maximum bit rate for link using NRZ data format is 9.86 Mbits/sec.\n"
]
}
],
"prompt_number": 6
}
],
"metadata": {}
}
]
}
|
