This full GPON SFP guide explains ITU-T G.984 standard OLT/ONT transceivers, Class B+ / Class C+ optical budget difference, P2MP burst-mode transmission principle, passive splitter topology and FTTH/FTTB engineering application scenarios, providing parameter reference for telecom operators and network integrators.

We will introduce some basic knowledge about GPON SFP optical transceivers.

1.What Is GPON & GPON SFP Transceiver?

GPON is one of the key technologies that are being used in fiber-based (FTTx) access networks, including fiber to the home (FTTH), fiber to the business (FTTB), fiber to the curb (FTTC), etc.

GPON SFP is one type of gigabit optical transceivers that are used in GPON system.

GPON SFPs utilize both the upstream data and downstream data by means

of Optical Wavelength Division Multiplexing (WDM).

GPON full name Gigabit Passive Optical Network, formulated by ITU-T G.984 international standard;
GPON SFP is hot-pluggable SFP package single-fiber bidirectional optical module, fixed wavelength division design: downstream 1480-1500nm (OLT transmit), upstream 1260-1360nm (ONT transmit). Standard rate: Downstream 2488Mbps, Upstream 1244Mbps, support maximum 1:128 passive optical splitter split ratio, transmission distance up to 20km over OS2 single-mode fiber.

2. Two Main Types: GPON OLT SFP vs GPON ONT SFP

GPON SFP transceivers are categorized into GPON OLT SFP and GPON ONT SFP or GPON ONU SFP depending on the devices they are used in.

1). OLT GPON SFP: Installed on central office OLT boards (such as GPBD board), adopt DFB continuous laser, built-in high-sensitivity burst-mode APD receiver to receive asynchronous upstream burst signals from multiple ONUs;
2). ONT GPON SFP: Built into home optical network terminal equipment, low-power laser chip, only receive fixed broadcast signal from OLT, transmit data in allocated TDMA timeslot.

3. What Are The Differences Between GPON Class B+ and Class C+?

And there are Class B+ GPON SFP and Class C+ GPON SFP. The major differences between them are the transmit power and the receive sensitivity.

4. GPON P2MP Transmission Topology & Working Principle

One GPON OLT SFP at the Central Office communicates with multiple GPON ONT SFPs with the help of fiber optic splitters.

5. What Are The Advantages of Deploying GPON SFP Modules?

Using GPON SFP is considered a more convenient and cost-effective solution for the end customers.

And it also reduces the devices that need to be provided by the Internet service provider (ISP).

It benefits both the service providers and the end users to some degree.

If want to know more about GPON SFP modules, welcome to visit our website or contact with our sales at sales@etulinktechnology.com. They will give you the professional answer.