A Mueller Matrix Modeling of a Lithium Niobate Electro-Optic Modulator under Different Electronic Bias Conditions

• Main Authors: Yan-Wei Chang, 張晏維
• Other Authors: Chen-Wen Tarn
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/th7wj6

碩士 === 國立臺灣科技大學 === 電子工程系 === 107 === 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.