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研究生： 索羅門 格塔喬海鲁
Solomon Getachew Hailu
論文名稱： Tunable Optical Delay Lines Based on Racetrack Resonators with Tunable Coupling and Stable Wavelength
Tunable Optical Delay Lines Based on Racetrack Resonators with Tunable Coupling and Stable Wavelength
指導教授： 李三良
San-Liang Lee
口試委員: 徐世祥
Shih-Hsiang Hsu
廖顯奎
Shien-Kuei Liaw
宋峻宇
Jiun-Yu Sung
張祐嘉
You-Chia Chang
曹恒偉
Hen Wai Tsao
學位類別： 博士
Doctor
系所名稱： 電資學院 - 光電工程研究所
Graduate Institute of Electro-Optical Engineering
論文出版年： 2020
畢業學年度： 108
語文別： 英文
論文頁數： 103
外文關鍵詞： Balanced Mach-Zehnder Interferometer, Racetrack Resonator, Tunable Optical Delay Line, Thermal Heating
相關次數： 點閱：216  下載：1 
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    • The integrated optical delay lines (ODLs), can be implemented using various structures, such as single or coupled resonators, gratings, photonic crystals, multi-path switchable structures, and recirculating loop structures. The delay tuning in ODLs is enabled by either changing the group refractive index of the waveguide or changing the length of the optical path. For optical sensing or biomedical sensing where the light source usually has a stable and narrow linewidth, the design rule of the tunable optical delay line (ODL) can be different from the ODLs for optical communications and buffering.
    In this work, we present here a novel way to tune a racetrack resonator based on a single-stage and two-stage ODL by a push-pull operation to stabilize the resonant wavelength. Full device simulation that accounts for the thermal tuning effect and the integrated device is conducted to verify the characteristics of the tunable optical delay lines.
    With the simple racetrack resonator, the group delay can simply be tuned by changing the coupling coefficient of the resonator while the wavelength is stabilized by tuning the racetrack loop. We demonstrate the tuning of group delay to nearly 20 ps for a single-stage and 40 ps for two-stage while fixing the resonant wavelength by adjusting the heating power of Heater 1 and Heater 3, respectively. The maximum group delay, in a single-stage and two-stage, as high as 200 ps, and 400 ps respectively can be achieved by tuning the coupling coefficient to have an even sharper resonant peak. With the proper control scheme, the novel architecture of two-stage ODLs doubles the group delay tunability range compared to a single-stage ODL. The tuning of hundreds of ps is achievable with a very compact device and very small power consumption.

    ABSTRACT I ACKNOWLEDGMENTS II TABLE OF CONTENTS III LIST OF FIGURES V LIST OF TABLES IX GLOSSARY OF TERMS………………………………………….............IX NOTATIONS………………………………………………………………XI CHAPTER 1 – INTRODUCTION…………………………………………1 1.1. Silicon Photonics 1 1.2. SOI Technology 5 1.3. Thermo-Optic Effect in Silicon 6 1.4 Motivation for the Work………………………………………………………..7 1.5 Organization of the Dissertation 10 CHAPTER 2 - LITERATURE REVIEW 11 2.1 Photonic Integrated Circuits for TODLs 11 2.2 Overview of Optical Delay Lines 13 2.2.1 Coupled Ring Resonator Based on Delay Lines………………………...14 2.2.2 Photonic Crystal Delay Lines 15 2.2.3 Recirculating Loop Delay Lines 17 2.2.4 Application of ODLs................................................................................18 CHAPTER 3 – PROPOSED ARCHITECTURE AND OPERATION PRINCIPLES 25 3.1 Single-Stage Tunable ODL Based on Racetrack Resonator with BMZI 27 3.2 Cascaded Integrated Tunable Optical Delay Line (ODL) 30 CHAPTER 4 – THEORETICAL MODELING OF TUNABLE ODL 34 4.1 Group Delay of TODL 34 4.2 Transfer Function of TODL 36 CHAPTER 5 – SIMULATION RESULTS AND DISCUSSION 41 5.1 Thermal Heating Simulation 44 5.2 Integrated ODL Simulation Result 48 5.2.1 Single-Stage of Tunable ODL 48 5.2.2 Two Cascaded Identical Stages of Tunable ODL 54 CHAPTER 6 – CONCLUSIONS AND FUTURE WORK 72 6.1 Conclusions 73 6.2 Future Work 74 REFERENCES 75 APPENDIX…………………………………………………………………87

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