The optical couplers are optical products that split a single optical input (signal) into two or combine optical inputs (signals) from two directions into a single output. The optical fiber used is a large-diameter HPCF fiber with a 400 µm core, making it ideal for applications requiring high light quantities. The fiber splitter uses Oki Electric Cable's proprietary mechanical method, which is highly resistant to mechanical stress and maintains high quality over a long period of time.