研究生: |
張晏維 Yan-Wei Chang |
---|---|
論文名稱: |
鈮酸鋰電光調變器在不同偏壓情形的穆勒矩陣表示式 A Mueller Matrix Modeling of a Lithium Niobate Electro-Optic Modulator under Different Electronic Bias Conditions |
指導教授: |
譚昌文
Chen-Wen Tarn |
口試委員: |
黃柏仁
Bohr-Ran Huang 黃柏仁 Bohr-Ran Huang |
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: | 中文 |
論文頁數: | 69 |
中文關鍵詞: | 鈮酸鋰調變器 、電光效應 、穆勒矩陣 |
外文關鍵詞: | Lithium niobate modulator, Electro optic effect, Mueller matrix |
相關次數: | 點閱:175 下載:0 |
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本論文提出了一種推導非等向性晶體(anisotropic crystal)穆勒矩陣(Mueller Matrix)的新方法,這類晶體如鈮酸鋰(LiNbO3),經常用於電光調變器。非等向性電光晶體中的偏振光波傳播可以透過向量波方程式(vector wave equation)來描述,而晶體的介電常數張量會隨著所施加的外部電信號偏壓產生微擾的情形。利用史托克斯向量(Stokes Vector)形式表示的入射偏振光,可以使用系統概念將非等向性晶體建模為一個從向量波方程式推導出的四乘四矩陣,即為穆勒矩陣。
輸出偏振光的史托克斯向量可以經由輸入光的史托克斯向量和晶體的穆勒矩陣的矩陣乘法運算獲得。為了驗證該理論,我們將三種不同相位的偏振光入射到內部具有鈮酸鋰晶體的電光調變器中來計算出輸出光的史托克斯向量。此外,利用邦加球(Poincaré sphere)的模擬結果、晶體中的方位角和橢圓角,我們可以找出輸出光的偏振態。
This thesis proposes a novel method to derive a Mueller Matrix of an anisotropic crystal, the Lithium Niobate (LiNbO3) which is common used in electro-optic modulators. The polarized optical wave propagation in an anisotropic electro-optic crystal can be properly described by the vector wave equation with the permittivity tensor is perturbed by the applied, external electrical signal. With the incident polarized optical wave represented in the form of the Stokes vector, the anisotropic crystal can be modeled using the system concept as a four-by-four matrix which is derived from the vector wave equation and is named as a Mueller Matrix of the crystal. The Stokes vector of the output polarized light wave can be simply obtained by a matrix multiplication operation of the input light Stokes vector and the Mueller Matrix of the crystal. To verify the theory, we simulate the Stokes vector of the output light by injecting three different phases polarized light into the electro-optic modulator which has a Lithium Niobate crystal inside. Moreover, with the simulation result of the Poincaré sphere, azimuth angle and ellipse angle in crystal, we can find the polarization states of the output light.
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