Gigabit Passive Optical Networks (GPON) is the leading technology being used in FTTx (FTTH) deployments. PON is different than other optical network topologies in that it is a Point to Multi-Point (P2MP) topology. From the Central Office’s (CO) Optical Line Terminal (OLT, with SFP GPON transceiver/module) a single strand of fiber goes out to a passive optical splitter where its signal is multiplied to 64(128) different lines. The Transmit and Receive signals operate on different wavelengths allowing bi-directional operation over a single fiber. Anything transmitted from the OLT is transmitted to all 32 lines. It is up to the customer’s system (Optical Network Unit - ONU) to determine what packets are for that customer. All other packets are discarded. The PON current standards have defined downstream data rates up to 2.5Gbps.

# ITU-T G.984 . GPON (Gigabit PON) is an evolution of the BPON standard. It supports higher rates, enhanced security, and choice of Layer 2 protocol (ATM, GEM, Ethernet). In early 2008, Verizon is in the process of installing millions of lines, while British Telecom and AT&T are in advanced trials.

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Part No.	Data Rate (TX/RX)	Wavelength (TX/RX)	Form	Distance	DDM	Application
						GEPON	GPON	FTTx
EOLF-GU5-X	1.25G/2.5G	1310nm/1490nm	2×5	Up to 20km			ONU
EOLF-GUA-X	1.25G/2.5G	1310nm/1490nm	2×10	Up to 20km			ONU
EOLS-GU-X	1.25G/2.5G	1310nm/1490nm	SFP	Up to 20km			ONU
EOLF-GT5-X	2.5G/1.25G	1490nm/1310nm	2×5	Up to 20km			OLT
EOLF-GTA-X	2.5G/1.25G	1490nm/1310nm	2×10	Up to 20km			OLT
EOLS-GT-X	2.5G/1.25G	1490nm/1310nm	SFP	Up to 20km			OLT