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提出了一种基于LiNbO3材料的非对称电极Y分叉数字光开关(DOS)结构。其特点是采用非对称电极结构加强锥形区和强耦合区的电极控制作用,从而提高开关的性能。计算机模拟显示,使用高于6 V的开关电压,其串扰可以压低到-26 dB左右,比对称电极结构约低8 dB,实验结果也验证了这种开关结构的可行性。在LiNbO3衬底上,通过Ti扩散波导工艺制作的样品,当开关电压为15 V时,串扰达到了-24 dB左右。
An asymmetric Y-branched digital optical switch (DOS) structure based on LiNbO3 was proposed. Its feature is the use of asymmetric electrode structure to strengthen the tapered area and the coupling area of the electrode control, thereby enhancing the performance of the switch. Computer simulations show that the crosstalk can be suppressed to about -26 dB with a switching voltage higher than 6 V, which is about 8 dB lower than that of the symmetrical electrode. The experimental results also verify the feasibility of this switching structure. On the LiNbO3 substrate, the sample produced by the Ti diffusion waveguide process achieves a -24 dB crosstalk at a switching voltage of 15 V.