Overview
The XG-PON OLT SFP+ Transceiver is a carrier-grade optical module designed for the Central Office (CO) or headend of a Passive Optical Network. Unlike standard point-to-point optics, this module serves as the root of a Point-to-Multi-Point (P2MP) network, capable of managing traffic for up to 128 subscribers (ONUs) from a single SFP+ port.
Operating strictly under the ITU-T G.987.2 XG-PON standard, this module provides asymmetric bandwidth: a massive 9.953 Gbps downstream channel and a 2.488 Gbps upstream channel. This configuration is optimized for residential and business broadband services where download demand significantly exceeds upload requirements, such as video streaming and content consumption. Encased in a standard SFP+ form factor, it plugs directly into XG-PON service boards on OLT chassis.
Key Features
- Asymmetric XG-PON Capacity: Delivers 10Gbps downstream and 2.5Gbps upstream bandwidth.
- High-Power N2a Optical Class: improved output power (+2 to +6 dBm) and sensitivity to support splits up to 1:128.
- Burst-Mode Receiver: Advanced Rx circuitry capable of handling time-division multiplexed (TDM) traffic from multiple ONUs.
- Standard SFP+ Package: Compact design allowing high port density on OLT line cards.
- Wavelengths: Transmits at 1577nm (Continuous) and receives at 1270nm (Burst).
- Digital Diagnostics: Integrated DDM/DOM for real-time monitoring of voltage, temperature, and optical power.
Applications
This OLT module is the engine behind modern Fiber-to-the-Home (FTTH) and Fiber-to-the-Building (FTTB) deployments:
- Triple-Play Services: delivering high-definition IPTV, VoIP, and high-speed internet simultaneously.
- Business Connectivity: providing cost-effective 10G downstream links for SMBs.
- Network Upgrades: Allowing ISPs to overlay 10G services on existing GPON fiber plants (via coexistence elements).
- Mobile Backhaul: Connecting small cells requiring high downstream throughput.
Specifications
| Parameter | Value |
|---|---|
| Form Factor | SFP+ (OLT Application) |
| Standard Compliance | ITU-T G.987.2 (XG-PON1) |
| Downstream Data Rate | 9.953 Gbps (Continuous Mode) |
| Upstream Data Rate | 2.488 Gbps (Burst Mode) |
| Tx Wavelength | 1577nm |
| Rx Wavelength | 1270nm |
| Optical Output Power | +2 to +6 dBm (N2a Class) |
| Receiver Sensitivity | ≤ -27.5 dBm |
| Connector Type | Simplex SC/UPC |
| Distance | 20km (Standard) |
Advantages
The XG-PON OLT SFP+ offers a strategic advantage for ISPs looking to increase bandwidth without the higher cost of symmetrical XGS-PON hardware. By utilizing an asymmetric 10G/2.5G architecture, operators can deliver “10 Gigabit” marketing speeds to customers while maintaining cost-efficiency on the upstream components.
Additionally, the N2a optical budget is a critical upgrade over older classes. It provides sufficient headroom to transmit through multiple splitter stages (e.g., 1:8 followed by 1:16) or reach subscribers at the edge of the 20km operational radius without requiring expensive reach extenders.
FAQ (Technical & Product Questions)
1. Can this OLT module support GPON ONUs?
No, this module speaks specifically the XG-PON protocol (G.987). It cannot communicate directly with legacy GPON ONUs. However, both XG-PON and GPON signals can run on the same physical fiber strand if mixed via an external WDM combiner (Coexistence Element), as they use different wavelengths.
2. What is the difference between Class N1, N2, and N2a?
These classes define the optical power budget (the difference between Tx power and Rx sensitivity). N1 typically offers a 29dB budget, while N2/N2a offers a higher budget (31dB). This N2a module provides stronger signal output, enabling higher split ratios (like 1:64 or 1:128) or longer distances compared to N1.
3. Why does this module use SC/UPC instead of LC?
While most data center SFP+ modules use LC connectors, PON standards and OLT equipment almost universally use SC/UPC (Subscriber Connector). The larger ferrule of the SC connector is more robust for the frequent patching and unpatching that occurs in telecom central offices.
4. Does this module support “Combo” PON?
No, this is a dedicated XG-PON module. A “Combo PON” transceiver combines both GPON and XG/XGS-PON lasers into a single SFP+ cage. This module only contains the lasers and electronics for XG-PON (1577nm/1270nm).
5. Can I use MPO/MTP® cables with this OLT module?
No. MPO/MTP® cables are for multi-fiber parallel optic connections. This OLT module requires a single-mode simplex fiber with an SC connector.
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