What Is The Difference Between SFP and PON?

PON (EPON SFP or GPON SFP) is an essential part of the PON system. With the increasing demand for higher capacity, increased diversity and personalization of services, capacity, and versatility of access networks need an expansion. PON as a major technology of FTTH provides point-to-point network access with lower installations and maintenance costs.

What Is a PON Transceiver?

PON transceiver is a bi-directional optical transceiver. PON in a single fiber from a central office optical network unit (ONU) is connected to optical network terminals (ONT) or optical network units (ONU) as customer premises. PON transceivers are further divided into the OLT transceiver module and ONU transceiver module with SFP, SFP/SFP+, or XFP package. In this blog, we will introduce the two common OLT transceivers used in GPON OR EPON networks - GPON SFP and EPON SFP.

GPON SFP

GPON SFP OLT transceivers are designed for theOLT side in the GPON network. GPON SFP uses a 1490nm continuous mode transmitter and 1310nm burst-mode receiver. The transmitter part utilizes 1490nm DFB LD with APC function and temperature compensation systems to assure a stable extinction ratio overall operating temperature range.

GPON OLT SFP transceiver is a high performance and cost-effective module for serial optical data transmission applications to 2.5Gpbs. GPON SFP transceiver is further divided into class B+ and Class C+

EPON SFP

EPON SFP transceiver is the house of high-performance optical modules providing symmetric 1.25 Gb/s downstream and 1.25 Gb/s upstream information link over a single fiber using a 1490nm continuous mode transmitter and 1310 nm burst-mode receiver. Its transmitter section uses 1490nm continuous DFB laser for superior performance and is class 1 laser compliant. The receiver of EPON SFP uses 1310nm APD, pre-amplifier, and limiting post-amplifier. Its receiver does not require a reset pulse between incoming optical packets of varying signal strength.

SFP

SFP+ stands for Small Form-factor Pluggable Plus. SFP+ transceivers are an improved version of the SFP that can hold data rates of up to 16Gbps. SFP+ modules have the same dimensions that are with SFP. However, the big difference between the SFP and SFP+ modules is their encoding method.

Difference Between EPON SFP and GPON SFP

In terms of OLT modules, you will see various similarities between EPON SFP and GPON SFP like - type of laser, transmission distance and communication model, etc. However, the key difference among both of them is the sending power and receiver sensitivity.

The sending power of GPON SFP Class B+ is 1.5~dBm and its receiver sensitivity is -28dBm while the sending power of Class C+ is 3~7dBm and receiver sensitivity is -32dBm.

The sending power of GPON SFP the upstream bandwidth is scalable from 155Mbps to 2.5Gbps while the downstream is designed to deliver 1.25 Gbps or 2.5Gbps. At present time it is the most widely used consumer broadband service in the FTTH network. EPON SFP on the other hand supports symmetric bandwidth of 1.25Gbps in both upstream and downstream directions.

Conclusion

In this blog, we have shared brief information about PON transceivers, GPON SFP, EPON SFP, and their differences. PON technology because of its increasing demand and emphasis will keep on developing and applying to PON systems.

For more information about PON and SFP transceivers and other fiber optic components check our website Santron Electronics

If you have any doubts or queries, feel free to contact us.

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