基于双发色团非线性分子的掩埋型共面波导电极聚合物电光调制器研究

项目名称： 基于双发色团非线性分子的掩埋型共面波导电极聚合物电光调制器研究

项目编号： No.61205032

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 孙小强

作者单位： 吉林大学

项目金额： 28万元

中文摘要： 极化聚合物相比于铌酸锂等无机材料，具有介电常数低、电光系数高的优点。聚合物电光调制器半波电压可降至0.65V，3dB带宽可达100GHz以上，是未来宽带光纤通信系统中极具竞争力的核心器件。高极化率发色团应用于波导结构中，存在极化效率降低和非线性弛豫问题，是聚合物调制器实用化面临的主要挑战。本项目从提高波导材料介电兼容性、优化层间界面形态和极化电荷的角度，揭示改善发色团介质氛围对增强波导电光稳定性和降低光损耗的作用，阐明分子极性对发色团溶解度和双发色团分子电光活性的影响，通过掩埋型共面波导电极提高电光重叠积分因子Γ和极化效率，抑制包层电弛豫导致的线性工作点漂移，采用光辅助极化方法制备基于SH1/DR1-PMMA的电光调制器，实现Γ×3＞25pm/V且2000h内衰减＜5%，光插入损耗＜8dB，3dB带宽＞20GHz。该项目为推动聚合物电光调制器实用化提供了重要的理论指导和实验依据。

中文关键词： 聚合物；光波导；电光调制器；双发色团分子；共面波导电极

英文摘要： Poled polymers have merits of low dielectric constant and high electro-optic (EO) coefficient contrasted with inorganic materials, such as LiNbO3. The half-wave voltage of poled polymer EO modulator can be reduced to 0.65V, while the 3dB bandwidth is improved to 100GHz. Thus, poled polymer modulator is a competitive device in the application of broadband optical fiber communication systems. The nonlinear relaxation in optical waveguide of high polarization chromophore must be resolved before the practical application. This project adopts the method based on the electrical and chemical compatibility to optimize performances of polymer EO modulators. The effect of improving dielectric surroundings and poling process on the basis of interface morphologies between layers and poled electric charges is revealed to enhance the EO stability and reduce optical losses. The interaction mechanism of binary chromophoreS, which is in favor of enhancing nonlinear optical performance, alleviating EO relaxation and optical losses, is studied. The DC drift induced by the electric relaxation of claddings is suppressed and the electro-optic overlap factor is enhanced through the application of buried coplanar waveguide (CPW) electrode and laser assistant poling. Device characteristics of optical insertion loss lower than 8dB, effec

英文关键词： Polymer；Optical waveguide；Electro-optic modulator；Binary chromophores；Co-planar waveguide electrode