Waveguide Structure: Inside the PLC splitter, the waveguide network is designed to divide the optical signal. This passive yet sophisticated device utilizes integrated optics technology to split a single input signal into multiple. A mini module splitter is a compact implementation of a PLC (Planar Lightwave Circuit) optical splitter, designed to divide a single optical input into multiple output fibers while occupying minimal physical space. It offers large output ports at low cost with a compact size, than fused couplers.