What wavelengths does XG-PON use?

XG-PON uses 1577nm for Downstream transmission and 1270nm for Upstream transmission, allowing it to coexist with GPON (1490nm/1310nm).

XG-PON Optical Transceivers (OLT & ONU)

Q: Is XG-PON the same as XGS-PON?

No. XG-PON provides Asymmetric speeds (10G Down / 2.5G Up), while XGS-PON provides Symmetric speeds (10G Down / 10G Up). They are different standards.

Q: Can I use an XG-PON SFP+ in a standard 10G SFP+ switch port?

No. These are PON-specific modules requiring OLT hardware with G.987 framing support. They will not function in a standard Ethernet switch SFP+ port.

Upgrade your fiber access network to the next generation with our premium selection of XG-PON (10-Gigabit-capable Passive Optical Network) transceivers. Compliant with the ITU-T G.987.2 standard, these modules allow service providers to deliver Asymmetric 10 Gbps downstream and 2.5 Gbps upstream bandwidth, significantly outperforming legacy GPON systems.

Our XG-PON portfolio includes everything required for a complete deployment, from Central Office OLT modules (available in both SFP+ and XFP form factors) to Customer Premises ONU/ONT modules. These transceivers are engineered for high-density FTTx applications, offering robust optical budgets (N1, N2, E1 classes) to support split ratios of up to 1:128 or 1:256.

The XG-PON Advantage

Unlike 10G EPON which allows for symmetric speeds, XG-PON is specifically designed as an Asymmetric technology optimized for residential high-speed internet, IPTV, and VoIP services where download demand far exceeds upload demand.

Downstream: 9.953 Gbps (1577nm)
Upstream: 2.488 Gbps (1270nm)

Product Range Overview

1. XG-PON OLT Modules

The OLT (Optical Line Terminal) interface drives the PON network. We offer two form factors to suit different chassis types:

XG-PON OLT SFP+: The most common form factor for modern, high-density line cards. Compact and energy-efficient.
XG-PON OLT XFP: Designed for specific legacy or high-power OLT platforms that utilize the larger XFP slot for better heat dissipation.

2. XG-PON ONU Modules

These SFP+ modules are installed at the subscriber end (ONU/ONT). They feature a tunable or fixed receiver to handle the 1577nm downstream signal and a burst-mode transmitter for the 1270nm upstream.

Optical Power Classes (N1 vs. N2a)

Just like Class B+ and C+ in GPON, XG-PON uses “N” classes to define the optical power budget and reach:

Class	Min Optical Budget	Typical Split Ratio	Application
N1 Class	29 dB	1:64	Standard deployments up to 20km.
N2 / N2a Class	31 dB	1:128	Long-reach scenarios or networks with higher passive loss.
E1 Class	33 dB	1:256	Extended reach and maximum split density.

Coexistence with GPON

XG-PON is designed to coexist seamlessly with standard GPON on the same fiber plant.

GPON: 1490nm (Down) / 1310nm (Up)

XG-PON: 1577nm (Down) / 1270nm (Up)

Because the wavelengths do not overlap, you can use a WDM Combiner (CEx Element) to serve both GPON and XG-PON subscribers on the same ODN, allowing for a gradual, cost-effective migration.

Frequently Asked Questions

1. Is XG-PON the same as XGS-PON?

No. XG-PON is Asymmetric (10G Down / 2.5G Up). XGS-PON is Symmetric (10G Down / 10G Up). However, they use the same wavelengths, so they cannot easily coexist on the same PON tree unless the OLT supports “Combo” modes.

2. Can I use an XG-PON SFP+ in a standard 10G SFP+ switch port?

No. XG-PON modules use specific framing (G.987) and burst-mode signaling that standard Ethernet switches cannot understand. They must be used in dedicated XG-PON OLT equipment.