Sopto PON SFP is a series of optical transceiver modules operating in Passive Optical Networks (PON).
From the Central Office's (CO) Optical Line Terminal (OLT, with PON SFP transceiver/module) a single strand of fiber goes out to a passive optical splitter where its signal is multiplied to maximum 128/64 different lines in GPON/EPON. The Transmit and Receive signals operate on different wavelengths realizing bi-directional operation at 1490nm/1310nm wavelengths over a single fiber.
Gigabit Passive Optical Networks (GPON) ITU G.984 standards have defined downstream data rates up to 2.5Gbps.
Ethernet Passive Optical Networks (GEPON or EPON) IEEE 802.3ah standards have defined downstream data rates up to 1.25Gbps.