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{
"metadata": {
"name": "",
"signature": "sha256:256c8b99e0e56930e177cf311c8d82ebc12805b19dc6acba2736a9016b128039"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 1: Overview of optical fiber communication"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.1, Page Number: 8"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#variable declaration\n",
"f1 = 100*1e3 #frequency1 = 100KHz\n",
"f2 = 1e9 #frequency2 = 1GHz\n",
"T1 = 1.0/f1 #Time period1 = 0.01ms\n",
"T2 = 1.0/f2 #Time period2 = 1 ns\n",
"\n",
"#calculation\n",
"phi = (0.25)*360.0 # Phase shift(degree)\n",
"\n",
"#result\n",
"print \"Phase shift = \",round(phi),\"Degree\",\"= \",round((round(phi)*math.pi)/180,4), \"radian\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Phase shift = 90.0 Degree = 1.5708 radian\n"
]
}
],
"prompt_number": 24
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.2, Page Number: 10"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#variable Declaration\n",
"flow=10*1e3 #Lowest frequency\n",
"fhigh=100*1e3 #Highest frequency\n",
"\n",
"#calculation\n",
"bandwidth=fhigh-flow\n",
"\n",
"#result\n",
"print \"Bandwidth=\",bandwidth/1000 ,\"KHz\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Bandwidth= 90.0 KHz\n"
]
}
],
"prompt_number": 25
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.4, Page Number: 12"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#variable Declaration\n",
"B = 10*1e6 # Bandwidth of noisy channel 1MHZ\n",
"S_N = 1 # signal to noise ratio is 1\n",
"\n",
"#calculation\n",
"C=B*(math.log(1+S_N)/math.log(2)) #capacity of channel(Mb/s)\n",
"\n",
"#result\n",
"print \"Capacity of channel =\",C/(10*1e6),\"Mb/s\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Capacity of channel = 1.0 Mb/s\n"
]
}
],
"prompt_number": 26
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.5, Page Number: 12"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#variable Declaration\n",
"fLow = 3*1e6 #low frequency = 3MHz\n",
"fHigh = 4*1e6 #high frequency = 4MHz\n",
"SNR_dB = 20 #signal to noise ratio 20 dB\n",
"\n",
"#calculation\n",
"B = fHigh-fLow #Bandwidth(MHz)\n",
"S_N = 10**(SNR_dB/10)\n",
"C = B*(math.log(1+S_N)/math.log(2)) #capacity of channel(Mb/s)\n",
"\n",
"#result\n",
"print \"Capacity of channel=\",round(C/(1e6),1),\"Mb/s\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Capacity of channel= 6.7 Mb/s\n"
]
}
],
"prompt_number": 27
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.6, Page Number: 14"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#variable Declaration\n",
"P1 = 1 # Let p1 be 1 watt\n",
"P2 = P1*0.5 # P2 is half of p1 so 1/2\n",
"\n",
"#calculation\n",
"Atten_dB = 10*(math.log(P2/P1)/math.log(10)) #attenuation or loss of power(dB)\n",
"\n",
"#result\n",
"print \"Attenuation loss =\",round(Atten_dB,0), \"dB\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Attenuation loss = -3.0 dB\n"
]
}
],
"prompt_number": 28
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.7, Page Number: 14"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#variable Declaration\n",
"Loss_line1 = -9 #attenuation of signal between point 1 to 2 = 9 dB\n",
"Amp_gain2 = 14 #Amplification of signal between point 2 to 3 = 14 dB\n",
"Loss_line3 = -3 #attenuation of signal between point 3 to 4 = 3 dB\n",
"\n",
"#calculation\n",
"dB_at_line4 = Loss_line1+Amp_gain2+Loss_line3 #power gain\n",
"\n",
"#result\n",
"print \"Power gain for a signal travelling from point1 to another point4 = \",dB_at_line4, \"dB\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Power gain for a signal travelling from point1 to another point4 = 2 dB\n"
]
}
],
"prompt_number": 29
}
],
"metadata": {}
}
]
}
|
