Guided Wave Optics in Super-EO Materials

超级电光材料中的导波光学

• 批准号: 9522740
• 负责人: Henry Taylor
• 金额: $ 30万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9522740&HistoricalAwards=false
• 关键词: Guided; Wave; Optics; Super; EO

9522740 Taylor The overall objective of this research is to obtain analytical and experimental results which support and promote the application of high-electrooptic-coefficient tungsten bronze ferroelectric materials ("super-EO materials") in a variety of guided wave optical devices. Techniques developed at Texas A&M for making the first low-loss waveguides and electrooptic modulators in tungsten bronze substrates will serve as the foundation for the proposed project. The waveguides are produced by a simple process in which static strain from a patterned surface film creates a localized refractive index increase. The Rockwell International Science Center, which has supplied super-EO materials to Texas A&M for several years, will continue in this collaborative role during the course of the proposed project. Research will be conducted in five critical task areas: (1) static strain optic (SSO) waveguide modeling, (2) device design, (3) material characterization, (4) modulator and switch development, and (5) tunable filter investigations. Two-dimensional refractive index profiles for TE and TM polarizations in SSO waveguides will be computed, considering both strain-optic and electrooptic contributions to the localized index change. A variation method will be utilized for waveguide mode analysis. Parameters needed for the waveguide and device models, such as strain-optic and electrooptic coefficients, refractive indices, and thermal expansion coefficients, will be measured. The recently discovered "self-poling" effect will be investigated experimentally to determine the conditions under which a large electrooptic effect is present without poling after processing of an SSO device at elevated temperatures. Electrooptic cutoff modulators, coupled waveguide switches, and tunable channel dropping filters which make use of the SSO waveguides will be designed, fabricated in the Rockwell substrates, and characterized. The proposed research will lay the groundwork for using super-EO materials in guided wave devices which could find increasing application in broadband communication networks over the next decade. Modulators and switches which exhibit order-of-magnitude improvement in performance over their counterparts in LiNbO3 - the traditional substrate of choice for guided wave electrooptic devices - will be sought. New channel-dropping filters for wavelength multiplexing with unprecedented tuning range, low crosstalk, and minimal electrical power dissipation will be explored. Successful demonstrations should reinforce Rockwell's expressed interest in commercializing the tungsten bronze substrates so that they will be generally available for research and device application. ***

9522740 Taylor 这项研究的总体目标是获得分析和实验结果，支持和促进高电光系数钨青铜铁电材料（“超级EO材料”）在各种导波光学器件中的应用。 德克萨斯农工大学开发的用于在钨青铜基板上制造第一批低损耗波导和电光调制器的技术将成为该项目的基础。波导是通过简单的工艺生产的，其中来自图案化表面膜的静态应变导致局部折射率增加。罗克韦尔国际科学中心多年来一直向德克萨斯农工大学提供超级环氧乙烷材料，该中心将在拟议项目过程中继续发挥这一合作作用。 研究将在五个关键任务领域进行：（1）静态应变光学（SSO）波导建模，（2）器件设计，（3）材料表征，（4）调制器和开关开发，以及（5）可调谐滤波器研究。将计算 SSO 波导中 TE 和 TM 偏振的二维折射率分布，同时考虑应变光学和电光对局部折射率变化的贡献。 波导模式分析将采用变分法。将测量波导和器件模型所需的参数，例如应变光学和电光系数、折射率和热膨胀系数。最近发现的“自极化”效应将通过实验进行研究，以确定在高温下处理 SSO 器件后，在没有极化的情况下出现大电光效应的条件。利用 SSO 波导的电光截止调制器、耦合波导开关和可调谐通道分出滤波器将在罗克韦尔基板上进行设计、制造和表征。 拟议的研究将为在导波器件中使用超级电光材料奠定基础，导波器件可能在未来十年在宽带通信网络中得到越来越多的应用。人们将寻求与LiNbO3（导波电光器件选择的传统衬底）中的同类产品相比性能有数量级改进的调制器和开关。将探索用于波长复用的新型通道下降滤波器，其具有前所未有的调谐范围、低串扰和最小的电功率耗散。成功的演示应该会加强罗克韦尔公司对钨青铜基材商业化的兴趣，以便它们普遍用于研究和设备应用。 ***