In optical networks, it is often necessary to split an optical signal into many identical signals, or to combine many signals into a single signal.
Na netwọk anya, ọ na-adịkarị mkpa iji kewaa mgbaàmà anya na ọtụtụ akara ngosi, ma ọ bụ iji jikọta ọtụtụ akara n'ime otu akara.