Isiginali ye-Optical iguqulwa ibe ngumqondiso wangoku ngokufaka i-fiber optical.Imodyuli ye-Si PIN inesekethe yokwandiswa kwangaphambili eyenza ukuba isignali yangoku ebuthathaka yandiswe kwaye iguqulelwe kwisignali yombane ukufezekisa inkqubo yokuguqulwa kwe-photon-photoelectric-signal amplification.