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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"#13: Fiber Optics "
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 13.1, Page number 13.5"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"numerical aperture is 0.391\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"n1=1.55; #refractive index of core\n",
"n2=1.50; #refractive index of cladding\n",
"\n",
"#Calculation\n",
"NA=math.sqrt(n1**2-n2**2); #numerical aperture\n",
"\n",
"#Result\n",
"print \"numerical aperture is\",round(NA,3)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 13.2, Page number 13.6"
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"angle of acceptance is 26 degrees 29.5 minutes\n",
"answer varies due to rounding off errors\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"n1=1.563; #refractive index of core\n",
"n2=1.498; #refractive index of cladding\n",
"\n",
"#Calculation\n",
"NA=math.sqrt(n1**2-n2**2); #numerical aperture\n",
"alpha_i=math.asin(NA); #angle of acceptance(radian)\n",
"alpha_i=(alpha_i*180/math.pi); #angle(degrees)\n",
"alpha_id=int(alpha_i);\n",
"alpha_im=60*(alpha_i-alpha_id);\n",
"\n",
"#Result\n",
"print \"angle of acceptance is\",alpha_id,\"degrees\",round(alpha_im,1),\"minutes\"\n",
"print \"answer varies due to rounding off errors\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 13.3, Page number 13.6"
]
},
{
"cell_type": "code",
"execution_count": 13,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"refractive index of core is 1.2333\n",
"answer varies due to rounding off errors\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"NA=0.39; #numerical aperture\n",
"delta=0.05; #difference of indices\n",
"\n",
"#Calculation\n",
"n1=NA/math.sqrt(2*delta); #refractive index of core\n",
"\n",
"#Result\n",
"print \"refractive index of core is\",round(n1,4)\n",
"print \"answer varies due to rounding off errors\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 13.4, Page number 13.7"
]
},
{
"cell_type": "code",
"execution_count": 15,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"fractional index change is 0.0416\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"n1=1.563; #refractive index of core\n",
"n2=1.498; #refractive index of cladding\n",
"\n",
"#Calculation\n",
"delta=(n1-n2)/n1; #fractional index change\n",
"\n",
"#Result\n",
"print \"fractional index change is\",round(delta,4)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 13.5, Page number 13.7"
]
},
{
"cell_type": "code",
"execution_count": 19,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"numerical aperture is 0.2965\n",
"angle of acceptance is 17 degrees 15.0 minutes\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"n1=1.48; #refractive index of core\n",
"n2=1.45; #refractive index of cladding\n",
"\n",
"#Calculation\n",
"NA=math.sqrt(n1**2-n2**2); #numerical aperture\n",
"alpha_i=math.asin(NA); #angle of acceptance(radian)\n",
"alpha_i=(alpha_i*180/math.pi); #angle(degrees)\n",
"alpha_id=int(alpha_i);\n",
"alpha_im=60*(alpha_i-alpha_id);\n",
"\n",
"#Result\n",
"print \"numerical aperture is\",round(NA,4)\n",
"print \"angle of acceptance is\",alpha_id,\"degrees\",round(alpha_im),\"minutes\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"##Example number 13.6, Page number 13.14"
]
},
{
"cell_type": "code",
"execution_count": 22,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"attenuation loss is 3.98 dB\n"
]
}
],
"source": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"Pout=40; #power(mW)\n",
"Pin=100; #power(mW)\n",
"\n",
"#Calculation\n",
"al=-10*math.log10(Pout/Pin); #attenuation loss(dB)\n",
"\n",
"#Result\n",
"print \"attenuation loss is\",round(al,2),\"dB\""
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.9"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
