We propose and experimentally demonstrate a novel high resolution lx4 adaptive optical power splitter based on the use of an Opto-VLSI processor and a 4-f imaging system with an optimized optical beam waist profile. By uploading optimized multicasting phase holograms onto the software-driven Opto VLSI processor, an input optical signal is dynamically split into different output fiber ports with user-defined splitting ratios.Experimental results showing dynamic optical splitting over a wavelength range exceeding 50 nm are presented.Index Terms-adaptive optical splitter, beam splitter, liquid crystal devices, optical communication, opto-VLSI processor.