What is the difference between Class B and Class C GPON SFP module

GPON stands for ‘Gigabit Passive Optical Network’. 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.
Optical Line Termination (OLT) is the most important equipement in GPON systems. Modern OLTs use compact GPON SFP modules to achieve Triple-play GPON services.

GPON OLT SFP MODULE C++

What Is a GPON SFP Module?

SFP stands for ‘Small Form-factor Pluggable’. A GPON SFP is one type of Gigabit Optical Transceivers that are used in GPON system, which is compliant with ITU-T G.984.2 standard. It is a bidirectional module that has SC receptacle and works over simplex single-mode fiber optic cable.

A GPON SFP module transmits and receives signals of different wavelengths between the OLT at the ‘Central Office’ side and the ONT at the end users side. GPON SFPs utilize both the upstream data and downstream data by means of Optical Wavelength Division Multiplexing (WDM).

GPON SFP OLT module,1490nm 2.5Gbps continuous-mode transmitter with DFB laser,1310nm 1.25Gbps burst-mode receiver with APD-TIA.Gigabit Passive Optical Networks (G-PON) – OLT side

What is difference GPON SFP: Class B+ vs. Class C+ vs. Class C++

There are three types GPON SFP modules Class B+ GPON SFP and Class C+ GPON SFP and Class C+++ GPON SFP module used for GPON OLT.

The main difference is the output optical power. Class C++ GPON SFP module output optical power is about 7dBm, the Class C+ GPON SFP module output optical power is about 5dBm. Of course, their optical receiver sensitivity is also different. The Class C++ optical receiver sensitivity is best.

The detail specification parameter table comparision as below: