Fiber optic beam splitters are used to divide light from one fiber into two or more fibers. Key Laboratory of Ultra-Weak Magnetic Field Measurement Technology, Ministry of Education, School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China 2. Research Institute for Frontier Science, Beihang University, Beijing, China The construction of large-scale. This paper presents composite beam splitters realized with polymer materials for developing photonic integrated circuits. Both 1XN and 2XN. Schematic illustration of a beam splitter cube. This division allows for the simultaneous analysis or utilization of the light's properties along two separate paths.