National Cheng Kung University Integrated Li Nb O
National Cheng Kung University Integrated Li. Nb. O 3 Electrooptical Electromagnetic Field Sensor Ching-Ting Lee Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University OEIC LAB 1
National Cheng Kung University Outline • • Introduction Principle and Configuration Experiments and Discussions Conclusions OEIC LAB 2
National Cheng Kung University Introduction Application of electromagnetic wave OEIC LAB 3
National Cheng Kung University Integrated Li. Nb. O 3 Electrooptical Electromagnetic Field Sensor with Micro Multi-antenna AZ 4260 Si. O 2 buffer layer Multi-annular antenna Matching resistance Polarization maintaining fiber Laser diode z y x Li. Nb. O 3 crystal Mach-Zehnder modulator Spectrum analyzer Single-mode fiber Photodetector OEIC LAB 4
National Cheng Kung University Principle Mach-Zehnder modulator Modulator electrode Input waveguide Output waveguide Li. Nb. O 3 substrate OEIC LAB 5
National Cheng Kung University Li. Nb. O 3 Crystal’s Electro-optic effect Buffer layer Modulator electrode Ti-diffusion Waveguide r 33 = 31 10 -12 m/V Z Z-cut Li. Nb. O 3 substrate X Y : optical phase L: length of electrode : wavelength d: gap between electrodes OEIC LAB 6
National Cheng Kung University Amplitude modulation optical output intensity optical output signal ½ V modulator voltage applied voltage Vi t electrical signal optical signal OEIC LAB 7
National Cheng Kung University Result 4 V • On-off extinction ratio is 25. 6 d. B • V is about 4 V OEIC LAB 8
National Cheng Kung University Integrated Li. Nb. O 3 Electrooptical Electromagnetic Field Sensor with Micro Multi-antenna AZ 4260 Si. O 2 buffer layer Multi-annular antenna Matching resistance Polarization maintaining fiber Laser diode z y x Li. Nb. O 3 crystal Mach-Zehnder modulator Spectrum analyzer Single-mode fiber Photodetector OEIC LAB 9
National Cheng Kung University Experiments and Discussions Configuration of multi-annular antenna 30 mm 20 mm 14 mm 12 mm load 10 mm H E S 0. 2 mm OEIC LAB 10
National Cheng Kung University Simulated resonant frequency of multi-annular antenna Return loss (d. B) 0 S 11 -5 5. 02 2. 73 -10 1. 34 -15 0 1 2 3 4 5 6 Frequency (GHz) OEIC LAB 11
National Cheng Kung University Advantages To obtain the frequency information To avoid the influence of the coaxial cable Microminiaturize OEIC LAB 12
National Cheng Kung University Anechoic chamber (500 MHz to 6 GHz) Emitter (Horn antenna) Test sensor Laser diode Photodetector E Signal generator Spectrum analyzer D=3 m OEIC LAB 13
National Cheng Kung University Experiments and Discussions Configuration of multi-annular antenna 30 mm 20 mm 14 mm 12 mm load 10 mm H E S 0. 2 mm OEIC LAB 14
National Cheng Kung University Simulated resonant frequency of multi-annular antenna Return loss (d. B) 0 S 11 -5 5. 02 2. 73 -10 1. 34 -15 0 1 2 3 4 5 6 Frequency (GHz) OEIC LAB 15
National Cheng Kung University Sensitivity factor Sf E(V/m) Sf Voutput(V) 1. 4 2. 8 5. 2 OEIC LAB 16
National Cheng Kung University The sensitivity of the sensor E-null configuration H E Load Average minimum detectable field intensity 2. 24 m. V/m OEIC LAB 17
National Cheng Kung University Experimental Measurement of Electromagnetic Source Azimuth Using Electrooptical Electromagnetic Field Probe Vertical view Lateral view Sensor 60 o 60 o 90 o 60 o 60 o Y X Z Axis of sensor probe OEIC LAB 18
National Cheng Kung University Schematic diagram of the electrooptical electromagnetic field probe system Probe Sensor 1 Laser diode Sensor 2 Sensor 3 Photodetector Spectrum analyzer Photodetector OEIC LAB 19
National Cheng Kung University H H S Signal intensity (d. Bm) Directional sensitivity pattern at 2. 8 GHz E OEIC LAB 20
National Cheng Kung University Conclusions ØThe 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 multiantenna. ØWhen 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 d. B 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. OEIC LAB 21
National Cheng Kung University Thank you! OEIC LAB 22
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