thermo-electric control board for integrated optical beam forming network · 2019-12-16 · boston...
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Thermo-Electric Control Board for Integrated Optical Beam Forming Network
James McKenna University of California, Santa Barbara Electrical Engineering Major
Yuan Liu, Professor Jonathan Klamkin Electrical and Computer Engineering Department
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! Utilizing higher frequency “millimeter wave” (75GHz-110GHz) for communications to drastically improve data transmission rates
! Shorter wavelength = More directional beam
! Using integrated optics to steer beam
Revolutionizing wireless communications
2 Adhikari, “Understanding millimeter wave wireless communication,” Loea Corporation 2008, pp 4.
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Beam steering schematic
Path 1 (Most Delayed)
Path 4 (Least Delayed)
Increasing Delay
Mckenna, Timothy P., Jeffrey A. Nanzer, and Thomas R. Clark. "Photonic beamsteering of a millimeter-wave array with 10-Gb/s data transmission."Photonics Technology Letters, IEEE 26.14 (2014): 1407-1410.
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! Each delay achieved by ring resonator
! Each ring resonator has heater paired with it
Ring resonator heater model
Chromium heater
Model of heater
Conductive Contact
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Waveguide
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! Need to control 64 independent current sources to tune delays
! Controlled from PC via I2C communication
Goal: Design 64-channel programmable current source
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! Utilizing a common op-amp feedback circuit with several additions to supply large amount of power ( > 1 Watt)
! Achieve max output conditions of 30 V, 43 mA given a 700 Ohm load
Amplifier design
Vout : 0-30 V
DAC0-5V
R2
R1
40V
Rout
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R3 = R1 || R2
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!
DAC Resolution Requirement
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! Main tests: Linearity and Stability
! Linearity: When changing the input voltages, the output varies linearly
! Stability: Output does not vary significantly if circuit is running at max power for long periods of time
Device testing
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y = 6.0281x - 0.1038
0
5
10
15
20
25
30
35
0 1 2 3 4 5 6
Testing results
Linearity Gain ~ 6
9
Out
put V
olta
ge (V
)
Input Voltage (V)
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20 21 22 23 24 25 26 27 28
0 1000 2000 3000 4000 5000
Stability
Testing results
Stability
Max variation = 0.3%
10
Out
put V
olta
ge (V
)
Time (s)
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Final Design
PCB Design For Board (In progress)
Example of another PCB control board
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C. Taddei et al., "Fully reconfigurable coupled ring resonator-based bandpass filter for microwave signal processing," Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP), 2014 International Topical Meeting on, Sendai, 2014, pp. 44-47. doi: 10.1109/MWP.2014.6994485
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! Next Step: Finish PCB design and solder final board
! The thermo-electric control board will help tune and optimize the integrated beam forming network
! A successful integrated optical beam forming network will bring us one step closer to revolutionizing wireless communication.
Conclusions and Future Work
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Acknowledgements
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Special thanks to:
! Mentor: Yuan Liu ! Faculty Advisor: Jonathan Klamkin ! Wendy Ibsen and the AIM Photonics Program ! All AIM participants and speakers