质子交换的新型集成光学TM通偏振器的研究

Study on A Novel Integrated Optical Proton Exchanged TM Pass Polarizers in LiNbO 3

提出了用扩钛和质子交换相结合的方法在x-切,y-传的LiNbO3 衬底上制成TM 通集成光波导偏振器的新方案, 即在扩钛波导两侧的适当位置引入锯齿形的质子交换区。用二维BPM法分析了这类新型偏振器的消光特性, 给出了质子交换区几何形状以及质子交换区与扩钛波导之间的间隙对TE波消光比的影响, 给出了数值分析结果, 并得到了优于23

A new method to fabricate TM pass polarizers by introducing zig zag shaped proton exchanged regions adjacent to a Ti diffusion waveguide on X cut, Y propagation lithium niobate is presented. A two dimension BPM (Beam Propagation Method) has been used to analyse this new kind of polarizer. The performance of the device is shown to depend strongly on the geometrical shapes of the proton exchange regions and their distances to channel waveguide. Through optimizing the parameters, a perfect device have been realized, and a TE extinction of 23 dB has been obtained experimentally.