研究生: |
GOPIKA UPPATH GOPIKA UPPATH |
---|---|
論文名稱: |
Beam steering of optical phased arrays by thermo-optic phase shifters for LIDAR applications Beam steering of optical phased arrays by thermo-optic phase shifters for LIDAR applications |
指導教授: |
李三良
San-Liang Lee |
口試委員: |
廖顯奎
Shein-Kuei Liaw 徐世祥 Shih-Hsiang Hsu 陳政寰 C.H.Chen 李三良 San-Liang Lee |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
論文出版年: | 2019 |
畢業學年度: | 107 |
語文別: | 英文 |
論文頁數: | 89 |
中文關鍵詞: | Thermo-optic phase shifter 、Crosstalk 、Beam steering 、Optical phased array 、Temperature Rise |
外文關鍵詞: | Thermo-optic phase shifter, Crosstalk, Beam steering, Optical phased array, Temperature Rise |
相關次數: | 點閱:191 下載:2 |
分享至: |
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Optical phased arrays (OPAs) have been widely used for many applications in the last few years. Optical phased arrays are used in many fields like holographic video displays, free-space optical communication systems and light detection and ranging (LIDAR) systems. Lidar is a remote sensing technique that emits the collimated light beam and measures the time it takes for the reflections to be detected by the signal. This is used to compute the distances to the objects.
Thermal tuning of the optical array with uniform spacing is used to induce a phase shift in waveguides. Heaters of the same length with a linear increase in power will change the refractive index of the waveguides. The change in refractive index will cause a phase shift to the waveguides. Since the waveguides in the optical phased array are placed in uniform spacing, the temperature rise (crosstalk) between the waveguides has been examined in this work. It has been noticed that the temperature rise (crosstalk) between the waveguides will increase in uniform spacing. Therefore, the temperature rise between the waveguides is reduced to 2 K for a fixed area by giving non-uniform spacing between the waveguides.
Then, the far-field analysis of the optical phased array with a single input has been evaluated. The electric field intensity and far-field pattern of the optical phased array are evaluated. The shifting of the beam along the theta direction is given in this work.
Optical phased arrays (OPAs) have been widely used for many applications in the last few years. Optical phased arrays are used in many fields like holographic video displays, free-space optical communication systems and light detection and ranging (LIDAR) systems. Lidar is a remote sensing technique that emits the collimated light beam and measures the time it takes for the reflections to be detected by the signal. This is used to compute the distances to the objects.
Thermal tuning of the optical array with uniform spacing is used to induce a phase shift in waveguides. Heaters of the same length with a linear increase in power will change the refractive index of the waveguides. The change in refractive index will cause a phase shift to the waveguides. Since the waveguides in the optical phased array are placed in uniform spacing, the temperature rise (crosstalk) between the waveguides has been examined in this work. It has been noticed that the temperature rise (crosstalk) between the waveguides will increase in uniform spacing. Therefore, the temperature rise between the waveguides is reduced to 2 K for a fixed area by giving non-uniform spacing between the waveguides.
Then, the far-field analysis of the optical phased array with a single input has been evaluated. The electric field intensity and far-field pattern of the optical phased array are evaluated. The shifting of the beam along the theta direction is given in this work.
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