We report on an integrated 1 × 5 beam splitter based on optical waveguides with type I and type II modifications of femtosecond laser (fs-laser) writing in lithium tantalate (LiTaO₃) crystal. The cladding waveguides consisting of type-II modified tracks are used for optical signal transmission, photon crosstalk reduction, and mode field regulation. The single-line waveguides with type I modification are utilized for light beam splitting. Type-I single-line waveguides are with relatively weak thermal stability, which are utilized to produce a recoverable and rewritable optical beam splitter, and the structure still possesses good transmission properties after the reconstruction. Especially, the type-I modified waveguides can be rewritten in very short time (1–2 min). The beam splitter shows good performance in outputting programmable optical signals, which provides a possible strategy for the development of erasable photonic data processors.

我们报告了一种基于光波导的集成 1 × 5 分束器，具有 I 型和 II 型飞秒激光（fs-laser）在钽酸锂（LiTaO ₃） 水晶。由 II 型改进轨道组成的包层波导用于光信号传输、光子串扰减少和模式场调节。具有 I 型修改的单线波导用于光束分裂。I型单线波导的热稳定性相对较弱，用于制作可恢复和可重写的分束器，该结构在重构后仍具有良好的传输性能。特别是，I 型改进波导可以在很短的时间内（1-2 分钟）改写。该分束器在输出可编程光信号方面表现出良好的性能，为可擦除光子数据处理器的发展提供了可能的策略。