ching-ting lee institute of microelectronics, department of electrical engineering,
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Integrated LiNbO 3 Electrooptical Electromagnetic Field Sensor. Ching-Ting Lee Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University. Introduction Principle and Configuration Experiments and Discussions Conclusions. Outline. Introduction. - PowerPoint PPT PresentationTRANSCRIPT
1OEIC LAB
National Cheng Kung University
Ching-Ting Lee
Institute of Microelectronics,
Department of Electrical Engineering,
National Cheng Kung University
Integrated LiNbO3 Electrooptical Electromagnetic Field Sensor
2OEIC LAB
National Cheng Kung University
Outline
• Introduction
• Principle and Configuration
• Experiments and Discussions
• Conclusions
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Application of electromagnetic waveApplication of electromagnetic wave
IntroductionIntroduction
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Integrated LiNbO3 Electrooptical Electromagnetic Field Sensor with Micro Multi-antenna
Multi-annular antenna
Laserdiode
Spectrum analyzer
xyz
Photodetector
LiNbO3
crystalSingle-mode fiber
Matching resistance
SiO2
buffer layer
Polarizationmaintainingfiber
AZ4260buffer layer
Mach-Zehnder modulator
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Mach-Zehnder modulatorMach-Zehnder modulator
LiNbO3 substrate
Modulator electrode
Output waveguide
Input waveguide
PrinciplePrinciple
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Ti-diffusionWaveguide
Modulator electrode
Z-cut LiNbO3 substrate
zeeeez Enrnnnn 3332
1
r33 = 3110-12 m/V
Lnz
2
zz EL
rn
333
: optical phase L: length of electrode: wavelengthd: gap between electrodes
Y
Z
X
Bufferlayer
dEV dLrn
Vz
333
LiNbOLiNbO3 3 Crystal’s Electro-optic effectCrystal’s Electro-optic effect
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Vi
V
optical output intensity
½
Amplitude modulationAmplitude modulation
applied voltage
modulator voltage
t
optical output signal
electrical signal
optical signal
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ResultResult
4V
• On-off extinction ratio is 25.6dB• V is about 4V
9OEIC LAB
National Cheng Kung University
Integrated LiNbO3 Electrooptical Electromagnetic Field Sensor with Micro Multi-antenna
Multi-annular antenna
Laserdiode
Spectrum analyzer
xyz
Photodetector
LiNbO3
crystalSingle-mode fiber
Matching resistance
SiO2
buffer layer
Polarizationmaintainingfiber
AZ4260buffer layer
Mach-Zehnder modulator
10OEIC LAB
National Cheng Kung University
load
30mm
20mm
12mm 14mm
10mm
10mm
0.2mm
Experiments and DiscussionsExperiments and Discussions
Configuration of multi-annular antennaConfiguration of multi-annular antenna
H E
S
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Simulated resonant frequencySimulated resonant frequency of multi-annular antennaof multi-annular antenna
S11
1.34
5.022.73
Frequency (GHz)
Return loss (dB)
0 1 2 3 4 5 6
0
-5
-10
-15
12OEIC LAB
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AdvantagesAdvantages
To obtain the frequency information
To avoid the influence of the coaxial cable
Microminiaturize
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Emitter (Horn antenna)
E
D=3m
Test sensor
Anechoic chamber (500MHz to Anechoic chamber (500MHz to 6GHz)6GHz)
Laser diode
Photodetector
Spectrum analyzer
Signal generator
14OEIC LAB
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load
30mm
20mm
12mm 14mm
10mm
10mm
0.2mm
Experiments and DiscussionsExperiments and Discussions
Configuration of multi-annular antennaConfiguration of multi-annular antenna
H E
S
15OEIC LAB
National Cheng Kung University
Simulated resonant frequencySimulated resonant frequency of multi-annular antennaof multi-annular antenna
S11
1.34
5.022.73
Frequency (GHz)
Return loss (dB)
0 1 2 3 4 5 6
0
-5
-10
-15
16OEIC LAB
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Sensitivity factor SSensitivity factor Sff
E(V/m) Sf Voutput(V)
0 1 2 3 4 5 670
80
90
100
110
120
Sen
siti
vit
y f
act
or (d
B)
Frequency (GHz)
1.42.8 5.2
17OEIC LAB
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The sensitivity of the sensorThe sensitivity of the sensor
Average minimum detectable
field intensity 2.24mV/m
-70 -60 -50 -40 -30 -20 -10 0-70
-60
-50
-40
-30
-20
-10
0 1.4 GHz 2.8 GHz 5.2 GHz
Normalized electric field intensity (dB)
Nor
mal
ized
indu
ced
volt
age
(dB
)
0
1
2
3
4
5
6
7
8
Ele
ctri
c fi
eld
inte
nsit
y (V
/m)
Load
H
E-nullconfiguration
E
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Experimental Measurement of Electromagnetic Source Azimuth Using Electrooptical
Electromagnetic Field Probe
Vertical view
90o
60o
60o
60o
Y
X
Z
Axis of sensor probe
Lateral view
60o
60o
60o
Sensor
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Probe
Sensor 2
Sensor 3
Schematic diagram of the electrooptical Schematic diagram of the electrooptical electromagnetic field probe systemelectromagnetic field probe system
Spectrum analyzer
Photodetector
Photodetector
Photodetector
Sensor 1
Laser diode
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Signal intensity (dBm)
Directional sensitivity pattern at 2.8 GHzDirectional sensitivity pattern at 2.8 GHz
E
H
S
H
0
30
60
90
120
150
180
210
240
270
300
330
-64
-62
-60
-58
-56
-64
-62
-60
-58
-56
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The response bandwidth of electromagnetic field sensor is successfully superposed by integrating micro multi-antenna. This is demonstrated that the center frequencies of response spectrum can be controlled by designing micro multi-antenna.
When the sensor probe axis was pointed toward the electromagnetic radiation source, the highest sensitivity was obtained. The variation of the sensitivity is within about 0.4 dB with rotating the probe around its axis. By using the electrooptical electromagnetic field probe system, the azimuth of the electromagnetic radiation source can be measured.
ConclusionsConclusions
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Thank you!