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{
"metadata": {
"name": "Chapter_10"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": "Chapter 10 : Optical amplification, wavelength conversion and regeneration\n"
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 10.1, page 555"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\nh=1.5*10**-6 #peak gain wavelength\ndelt=10**-9 #mode spacing\nl=300*10**-6 #length\nc=2.998*10**8 #speed of light\nr=0.09 #facet reflectivities\ngs=3.020\n\n#Calculation\nn=(h**2)/(2*delt*l) #refractive index\na=c/(math.pi*n*l)\nd=1-(math.sqrt(r)*gs)\nf=2*math.sqrt(math.sqrt(r)*gs)\nB=a*math.asin(d/f) #spectral bandwidth\n#Result\nprint'Refractive index of a medium = %.2f'%n\nprint'3dB spectral bandwidth = %.1f GHz'%(B*10**-9)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Refractive index of a medium = 3.75\n3dB spectral bandwidth = 4.2 GHz\n"
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 10.3, page 562"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\ngs=30 #gain in dB\ng=200 #net gain\nloge=0.434 #log(e)\ngs1=1000\nm=2.2 #mode no\nnsp=4 #spontaneous emission factor\nh1=6.626*10**-34 #plancks constant\nf=1.94*10**14\nB=1.0*10**12 #bandwidth\n\n#Calculation\nL=gs/(10*g*loge) #length of the device\nP=m*nsp*(gs1-1)*h1*f*B #noise power spectral density\n\n#Result\nprint'(a) Length of the device = %.2f mm'%(L*10**3)\nprint'(b) Noise power spectral density = %.2f mW'%(P*10**3)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "(a) Length of the device = 34.56 mm\n(b) Noise power spectral density = 1.13 mW\n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 10.4, page 580"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\nGp=62.2 #parametric peak gain in dB\nlog=10*math.log10(0.25)\nPp=1.4 #signal power in watt\nL=500 #length in meter\nlog2=20*math.log10(2.7182818284)\n\n\n#Calculation\ny=(Gp-log)/(Pp*L*log2) #fiber nonlinear coefficient\nGp2=10*math.log10((y*Pp*L)**2) #parametric gain\n \n#Result\nprint'(a) Fiber nonlinear coefficient = %.2f x 10^-3 W^-1 km^-1'%(y*1000)\nprint'(b) Quadratic gain, Gp = %.2f dB'%(Gp2)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "(a) Fiber nonlinear coefficient = 11.22 x 10^-3 W^-1 km^-1\n(b) Quadratic gain, Gp = 17.90 dB\n"
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 10.5, page 589 "
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\npt=0.5*10**-3 #input signal power\ndpt=0.01*10**-6 #input signal power variation\nh=1.55*10**-6 #signal wavelength\na=-1 #linewidth enhancement factor\ndn=-1.2*10**-26 #differential refractive index\n\n#Calculation\ndelt=(-a*dpt)/(4*math.pi*pt) #frequency chirp\ndg=(4*math.pi*dn)/(h*a) #differential gain\n \n#Result\nprint'(a) Frequency chirp variation = %.2f MHz'%(delt*10**6)\nprint'(b) Differential gain = %.2f x10^-20 m^2'%(dg*10**20)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "(a) Frequency chirp variation = 1.59 MHz\n(b) Differential gain = 9.73 x10^-20 m^2\n"
}
],
"prompt_number": 4
}
],
"metadata": {}
}
]
}
|
