Group velocity dispersion characteristics of rib-type photonic wire(PW) based on LiNbO₃ on insulator(LNOI) were studied theoretically. The study focuses on flexibility in dispersion tailoring, zero dispersion, dispersion flatness and zero modal birefringence(ZMB). The results show that the LNOI PW is more flexible in dispersion tailoring than the conventional Ti-diffused LiNbO₃ waveguide and Si-on-Insulator (SOI) PW. Zero dispersion at 1.55 μm wavelength can be realized for both TE and TM modes. Zero dispersion wavelength shows definite polarization dependence. It can be tailored by adjusting the rib height. For a TE mode guided in a appropriately designed LNOI PW, zero dispersion can be realized in a broad wavelength range of 1.3–1.7 μm. The TE mode is thus more suitable for dispersion flatness application. The dispersion flatness of the LNOI PW is one order of magnitude better than that of the SOI PW. In contrast, the TM mode is more suitable for dispersion engineering as it shows more significant dispersion feature. ZMB can be realized by adopting an X-cut/Y-propagation scheme. A PW geometry for simultaneous realization of single-mode operation and ZMB is presented.

从理论上研究了基于LiNbO ₃的肋型光子导线在绝缘子（LNOI）上的群速度色散特性。该研究的重点是色散裁剪，零色散，色散平坦度和零模态双折射（ZMB）的灵活性。结果表明，LNOI PW比常规的Ti扩散LiNbO ₃更灵活地进行色散调节波导和绝缘体上硅（SOI）PW。TE和TM模式均可在1.55μm波长处实现零色散。零色散波长显示出明确的偏振依赖性。可以通过调整肋骨高度来定制。对于在适当设计的LNOI PW中引导的TE模式，可以在1.3–1.7μm的宽波长范围内实现零色散。因此，TE模式更适合于色散平坦度应用。LNOI PW的色散平坦度比SOI PW的色散平坦度好一个数量级。相比之下，TM模式更适合色散工程，因为它显示出更显着的色散特性。ZMB可以通过采用X切割/ Y传播方案来实现。提出了用于同时实现单模式操作和ZMB的PW几何。