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{
"metadata": {
"name": "Chapter_8"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": "Chapter - 8 : Optical detectors"
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8.1, page 454"
},
{
"cell_type": "code",
"collapsed": false,
"input": "#Variable declaration\nn=1.2*10**11 #no of electrons\nm=3*10**11 #no of photons\ne=1.602*10**-19 #1 electron volt\nh=0.85*10**-6 #wavelength\nh1=6.626*10**-34 #plancks constant\nc=2.998*10**8 #speed of light\n\n#Calculation\nQ=n/m #quantum efficiency\nR=(Q*e*h)/(h1*c) #responsivity\n\n#Result\nprint'Quantum efficiency = %.1f '%Q\nprint'Responsivity = %.3f A W^-1'%R",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Quantum efficiency = 0.4 \nResponsivity = 0.274 A W^-1\n"
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8.2, page 454"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\nh1=6.626*10**-34 #plancks constant\nc=2.998*10**8 #speed of light\nE=1.5*10**-19 #energy of photons\nn=0.65 #quantum efficiency\ne=1.602*10**-19 #1 electron volt\nio=25*10**-6 #photocurrent\n\n#Calculation\nh=h1*c/E #wavelength\nR=(n*e)/(E) #responsivity\npo=io/R #incident optical power\n\n#Result\nprint'(a) Wavelength = %.2f um'%(h*10**6)\nprint'(b) Incident optical power = %.2f uW'%(po*10**6)\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "(a) Wavelength = 1.32 um\n(b) Incident optical power = 36.01 uW\n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8.3, page 456"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\nh1=6.626*10**-34 #plancks constant\nc=2.998*10**8 #speed of light\ne=1.602*10**-19 #1 electron volt\nE=1.43 #bandgap energy in eV\n\n#Calculation\nh=h1*c/(E*e) #wavelength\n\n#Result\nprint'Wavelength = %.3f um'%(h*10**6)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Wavelength = 0.867 um\n"
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8.4, page 463"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\nw=20*10**-6 #width\nvd=10**5 #drift velocity\nr=500*10**-6 #diameter in meter\nes=10.5*10**-13 #permitivity\n\n#Calculation\ntd=w/vd #drift time\nA=math.pi*r**2 #area\ncj=es*A/w #junction capacitance\n\n#Result\nprint'Drift time = %.1f x 10^-10 S'%(td*10**10)\nprint'Junction capacitance = %.2f x 10^-13 F'%(cj*10**13)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Drift time = 2.0 x 10^-10 S\nJunction capacitance = 0.41 x 10^-13 F\n"
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8.5, page 464"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\nvd=3*10**4 #drift velocity\nw=25*10**-6 #width\n\n#Calculation\nBm=vd/(2*math.pi*w) #maximum bandwidth\ntr=1/Bm #maximum response time\n\n#Result\nprint'Maximum response time = %.1f ns'%(tr*10**9)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Maximum response time = 5.2 ns\n"
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8.6, page 470"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\nh1=6.626*10**-34 #plancks constant\nc=2.998*10**8 #speed of light\ne=1.602*10**-19 #1 electron volt\nl=8*10**-9 #dark current\nn=0.55 #quantum efficiency\nh=1.3*10**-6 #wavelength\nA=100*50*10**-12\n\n#Calculation\nnep=(h1*c*math.sqrt(2*e*l))/(n*e*h) #Noise equivalent power\nD=math.sqrt(A)/nep #Specific detectivity\n\n#Result\nprint'Noise equivalent power = %.2f x 10^-14 W'%(nep*10**14)\nprint'Specific detectivity = %.1f x 10^8 m Hz^(1/2) W^-1'%(D*10**-8)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Noise equivalent power = 8.78 x 10^-14 W\nSpecific detectivity = 8.1 x 10^8 m Hz^(1/2) W^-1\n"
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8.7, page 482"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\nh1=6.626*10**-34 #plancks constant\nc=2.998*10**8 #speed of light\ne=1.602*10**-19 #1 electron volt\nn=0.8 #quantum efficiency\nh=0.9*10**-6 #wavelength\npo=0.5*10**-6 #incident optical power\nI=11*10**-6 #output current\n\n#Calculation\nR=(n*e*h)/(h1*c) #resposivity\nIp=po*R #photocurrent\nM=I/Ip #multiplication factor\n\n#Result\nprint'Multiplication factor = %.2f '%M\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Multiplication factor = 37.89 \n"
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8.8, page 487"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\nh1=6.626*10**-34 #plancks constant\nc=2.998*10**8 #speed of light\ne=1.602*10**-19 #1 electron volt\nh=1.26*10**-6 #wavelength\nIc=15*10**-3 #collector current\npo=125*10**-6 #incident optical power\nn=0.4 #quantum efficiency\n\n#Calculation\ngo=(h1*c*Ic)/(h*e*po) #Optical gain\nhfe=go/n #Common emitter current gain\n \n#Result\nprint'Optical gain, Go = %.1f'%go\nprint'Common emitter current gain, hfe = %.1f '%hfe",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Optical gain, Go = 118.1\nCommon emitter current gain, hfe = 295.2 \n"
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 8.9, page 491"
},
{
"cell_type": "code",
"collapsed": false,
"input": "import math\n\n#Variable declaration\nt=5*10**-12 #electron transit time\nG=70 #Optical gain\n\n#Calculation\nB=1/(2*math.pi*t*G) #Maximum 3dB bandwidth\n\n#Result\nprint'Maximum bandwidth = %.1f MHz'%(B*10**-6)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Maximum bandwidth = 454.7 MHz\n"
}
],
"prompt_number": 9
}
],
"metadata": {}
}
]
}
|
