The Bit Error Rate Evaluation of an Electrooptic Modulator under the Influence of Polarization Mode Dispersion

• Main Authors: Lin Nan-Ying, 林男穎
• Other Authors: Tarn Chen-Wen
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/23278368473161139345

碩士 === 國立臺灣科技大學 === 電子工程系 === 93 === In high-speed optical fiber communication systems, polarization mode dispersion (PMD) becomes a major factor which degrades the quality of the system and limits the capability of transmission. The electro-optic (E-O) modulator which modulates optical carrier by means of electro-optic effect is an essential component in optical fiber communication systems. In this thesis, the phenomenon of PMD in the E-O modulator is investigated and the theoretical model is developed. The differential group delay (DGD) of the output light which passes through the E-O modulator PMD is estimated and verified by the experimental data. The E-O modulator which is fabricated by an inhomogeneous crystal with an anisotropic property is used generally in modern optical communication systems. Assuming the incident lightwave with an arbitrary state of polarization, the coupled-wave equations can be derived from the three dimension Maxwell's equations. A theoretical model which is used to estimate the PMD can be developed. The theoretical mode is verified by the eye diagrams simulated by the Virtual Photonics Incorporated (VPI) ActivePhotonics software and is confirmed by the a set of experimental deviations measured by synchronous and asynchronous amplitude histogram techniques.