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{
"metadata": {
"name": "",
"signature": "sha256:1cf24b70876a8aeb6aa008651e71d8cde215c5cbb4fe65495bcd461a3cc2b49b"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter24-Fibre Optics"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex1-pg701"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 24.1\n",
"##Fiber optics\n",
"\n",
"##given values\n",
"n=1.5;##refractive index\n",
"x=.0005;##fractional index difference\n",
"\n",
"##calculation\n",
"u=n*(1-x);\n",
"print'%s %.2f %s'%('cladding index is',u,'');\n",
"alpha=math.asin(u/n)*180/math.pi;\n",
"print'%s %.2f %s'%('critical internal reflection angle(in degree) is',alpha,'');\n",
"theta=math.asin(math.sqrt(n**2-u**2))*180/math.pi;\n",
"print'%s %.2f %s'%('critical acceptance angle(in degree) is',theta,'');\n",
"N=n*math.sqrt(2.*x);\n",
"print'%s %.2f %s'%('numerical aperture is',N,'');"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"cladding index is 1.50 \n",
"critical internal reflection angle(in degree) is 88.19 \n",
"critical acceptance angle(in degree) is 2.72 \n",
"numerical aperture is 0.05 \n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex2-pg701"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 24.2\n",
"##calculation of acceptance angle\n",
"\n",
"##given values\n",
"n=1.59;##cladding refractive index\n",
"u=1.33;##refractive index of water\n",
"N=.20;##numerical aperture offibre\n",
"##calculation\n",
"x=math.sqrt(N**2+n**2.);##index of fibre\n",
"N1=math.sqrt(x**2-n**2.)/u;##numerical aperture when fibre is in water\n",
"alpha=math.asin(N1)*180./math.pi;\n",
"print'%s %.2f %s'%('acceptance angle in degree is',alpha,'');"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"acceptance angle in degree is 8.65 \n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex3-pg705"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 24.3\n",
"##calculation of normalised frequency\n",
"\n",
"##given values\n",
"n=1.45;##core refractive index\n",
"d=.6;##core diametre in m\n",
"N=.16;##numerical aperture of fibre\n",
"l=.9*10**-6.;##wavelength of light\n",
"\n",
"##calculation\n",
"u=math.sqrt(n**2.+N**2.);##index of glass fibre\n",
"V=math.pi*d*math.sqrt(u**2.-n**2.)/l;\n",
"print'%s %.2f %s'%('normalised frequency is',V,'');"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"normalised frequency is 335103.22 \n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex4-pg705"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 24.4\n",
"##calculation of normailsed frequency and no of modes\n",
"\n",
"##given values\n",
"n=1.52;##core refractive index\n",
"d=29*10**-6.;##core diametre in m\n",
"l=1.3*10**-6.;##wavelength of light\n",
"x=.0007;##fractional refractive index\n",
"\n",
"##calculation\n",
"u=n*(1.-x);##index of glass fibre\n",
"V=math.pi*d*math.sqrt(n**2-u**2)/l;\n",
"print'%s %.2f %s'%('normalised frequency is',V,'');\n",
"N=V**2./2.;\n",
"print'%s %.2f %s'%('no of modes is',N,'');"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"normalised frequency is 3.99 \n",
"no of modes is 7.94 \n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex5-pg706"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 24.5\n",
"##calculation of numerical aperture and maximum acceptance angle\n",
"\n",
"##given values\n",
"n=1.480;##core refractive index\n",
"u=1.47;##index of glass\n",
"l=850*10**-9.;##wavelength of light\n",
"V=2.405;##V-number\n",
"\n",
"##calculation\n",
"r=V*l/math.sqrt(n**2-u**2)/math.pi/2;##in m\n",
"print'%s %.2f %s'%('core radius in micrometre is',r*10**6,'');\n",
"N=math.sqrt(n**2-u**2);\n",
"print'%s %.2f %s'%('numerical aperture is',N,'');\n",
"alpha=math.asin(N)*180/math.pi;\n",
"print'%s %.2f %s'%('max acceptance angle is',alpha,'');"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"core radius in micrometre is 1.89 \n",
"numerical aperture is 0.17 \n",
"max acceptance angle is 9.89 \n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex6-pg712"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 24.6\n",
"##calculation of power level\n",
"\n",
"##given values\n",
"a=3.5;##attenuation in dB/km\n",
"Pi=.5*10**-3.;##initial power level in W\n",
"l=4.;##length of cable in km\n",
"\n",
"##calculation\n",
"Po=Pi*10**6./(10**(a*l/10.));\n",
"print'%s %.2f %s'%('power level after km(in microwatt) is',Po,'');\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"power level after km(in microwatt) is 19.91 \n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex7-pg712"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"##Example 24.7\n",
"##calculation of power loss\n",
"\n",
"##given values\n",
"Pi=1*10**-3.;##initial power level in W\n",
"l=.5;##length of cable in km\n",
"Po=.85*Pi\n",
"\n",
"##calculation\n",
"a=(10./l)*math.log10(Pi/Po);\n",
"print'%s %.2f %s'%('loss in dB/km is',a,'');\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"loss in dB/km is 1.41 \n"
]
}
],
"prompt_number": 7
}
],
"metadata": {}
}
]
}
|
