Research on the Performance Enhancement of the Beam Splitter in Photonics Communication Chips

In the era of vigorous development of optoelectronic technology, the high-performance lithium niobate optical beam splitter, as a core component for optical signal processing and transmission, provides an excellent material basis for optical signal modulation with its outstanding electro-optical properties. At present, it has been found in research and application that three-dimensional
ridge-shaped strip waveguides can enhance the interaction between light and electric fields. Multimode interferometric couplers (MMI) have the advantages of compact structure, simple fabrication and stable mode conversion. The combination of the two can achieve efficient optical beam splitting and precise modulation, effectively improving the modulation efficiency. Through theoretical analysis and numerical simulation, the light field distribution, mode characteristics and modulation performance parameters of this structure were deeply studied. The results show that compared with the traditional structure, this design significantly improves the modulation efficiency, and can effectively reduce mode crosstalk at the same time, achieving stable optical signal beam splitting and modulation. This research provides a new approach for the application of lithium niobate beam splitters in high-speed optical communication, optical signal processing and other fields, which is conducive to promoting the development of optoelectronic integrated devices.