Abstract: A multilayered rail guide vehicle system for use in three-dimensional planting in a plant factory and a control method therefor, the system includes an upper computer, cultivation shelves, traveling devices, lifting devices, and an electric control system. The traveling devices and the lifting devices are arranged in a body of a rail guide vehicle. The upper computer is in wireless communication with the electric control system. A nutrient solution tank is arranged on each of the cultivation shelves, and a plurality of cultivation positions are arranged on the nutrient solution tank. The electric control system is arranged in the body of the rail guide vehicle, so as to obtain an operation mode and target information after receiving a task instruction transmitted by the upper computer, select and switch a positioning mode, and drive the traveling devices and the lifting devices to perform traveling and lifting positioning according to operation procedures.

Abstract: A PIC comprising an optical edge coupler having a plurality of optical cores within a heterogeneous stack of dielectric layers providing an optical cladding for the optical cores. The layer stack comprises first and second groups of layers, wherein refraction-index differences between individual layers of the same group are much smaller than refraction-index differences between any two layers from different groups. The optical cores are arranged in a plurality of parallel planar arrays enabling a large MFD change. At least one of the arrays is located within the first group of layers, and at least another one of the arrays is located within the second group of layers. End sections of the optical cores are adjacent to an edge of the PIC and may be optically coupled to an external optical fiber or on-chip waveguide of another PIC for a low-loss transfer of optical power therebetween.