The (2+1)x1 Multimode Pump & Signal Combiner is a high-performance passive optical component specifically designed for high-power fiber laser and fiber amplifier systems. It efficiently combines two multimode pump inputs with one signal input into a single double-clad output fiber, where the signal propagates through the core and the pump light propagates through the inner cladding. This configuration enables simultaneous transmission of pump and signal light within the same fiber, ensuring high pump efficiency, low insertion loss, and high output stability.