STTR Phase II: Hybrid Optical Module with a Narrowband Electro-Optically Tunable Filter

完成第一阶段工作的主要目标是证明在LiNbO3波导上高反射低损耗硅光栅的可行性。我们从理论上和实验上证明，高折射率Si覆盖层可以实现LiNbO3波导中有效模式折射率的实质性扰动，而不会增加导模的光学损耗。利用这一现象构建了具有80%反射率的高性能Si分布式Bragg反射器。随后，利用硅光栅在LiNbO3波导上实现了具有电光可调谐性的窄带非对称法布里-珀罗滤波器。该滤波器在混合激光滤光模块中进行了测试。利用Si-on-LiNbO3结构开发的高性能DBR光栅技术有助于开发各种先进器件，特别是滤波器和紧凑型波导激光源，如连续波、锁模、调q和可调谐激光器。这些设备在电缆和电信行业，特别是在WDM网络中是非常需要的。＊＊＊

*** 9805388 Tavlykaev The primary goal of the completed Phase I effort was to prove the feasibility of hig-reflectance low-loss silicon gratings on LiNbO3 waveguides. We showed theoretically and demonstrated experimentally that a substantialperturbationof the effective mode index ina LiNbO3 waveguide can be achieved with a high-index Si overlay without increasing optical loss for the guided mode. This phenomenon was used to build a high performance Si Distributed Bragg reflector with 80% reflectivity. Subsequently, a narrowband asymmetric Fabry-Perot filter with electro0optical tunability was realized using a Si grating on a LiNbO3 waveguise. The filter was tested in a hybrid laser-filter module. The developed technology of high performance DBR gratings using Si-on-LiNbO3 structures is useful in developing a variety of advanced devices, in particular, filters and compact waveguide laser sources, such as CW, mode locked, Q-switched, and tunable lasers. These devices are sorely needed inthe cable and telecommunication industry, especially in WDM networks. ***