GPON XGS-PON Combo OLT SFP+ Module | Class D High Power MPM

Overview

Boost your fiber network’s capacity and reach with the GPON XGS-PON Combo OLT SFP+ Module (Class D). This high-performance transceiver is a Multi-Protocol Module (MPM) designed for standard central office environments (Commercial Temperature), capable of transmitting both 10G XGS-PON and 2.5G GPON services simultaneously over a single fiber strand.

The defining feature of this module is its Class D (Super Class C+) optical budget. Delievering significantly higher transmit power than standard Class B+ or C+ modules, it offers an optical link budget of approximately 35 dB. This allows network operators to maximize split ratios (up to 1:256) or extend fiber reach up to 40km without external amplification, making it ideal for high-density FTTx deployments.

Key Features

• Class D High Power: “Super” optical budget (~35 dB) for maximum network penetration.
• Combo PON Technology: Supports simultaneous XGS-PON (10G/10G) and GPON (2.5G/1.25G).
• SFP+ / SFP-DD Form Factor: Fits standard MPM-ready OLT ports (SFP-DD electrical interface).
• High Tx Power:
  • XGS-PON: +4 to +8 dBm
  • GPON: +4 to +8 dBm
• Wavelengths: 1577nm (XGS Tx) & 1490nm (GPON Tx).
• Commercial Temperature: Optimized for climate-controlled data centers (0°C to 70°C).
• Connector: SC/UPC interface.

Applications

The Class D Combo Module is tailored for scenarios requiring extra optical margin:

• Central Office (CO) Upgrades: Instantly upgrade existing GPON OLT chassis to support 10G XGS-PON without changing optical distribution networks (ODN).
• Long-Reach FTTx: Connect subscribers located at the extreme edge of the network (20km+).
• High-Density Splitting: Supports 1:128 or even 1:256 split ratios to maximize subscriber connections per OLT port.
• Lossy Legacy Networks: Overcome high insertion loss in older fiber plants with multiple patch points.

Specifications

Cross-Platform Compatibility

This Class D Combo Module utilizes the SFP-DD mechanical standard often found in modern Multi-Protocol (MPM) line cards. It is compatible with the following systems:

Advantages

Choosing Class D optics provides a critical “future-proofing” advantage. As networks age, connector end-faces degrade and fiber splices add loss. The extra 3-5dB margin provided by Class D ensures that links remain stable years after deployment. Additionally, the ability to run GPON and XGS-PON on the same port reduces physical footprint and power consumption in the exchange.

FAQ (Technical & Product Questions)

1. What is the difference between Class C+ and Class D?

Class C+ typically offers a budget of roughly 32 dB. Class D (or Class C++) pushes this to approximately 35 dB. This extra 3 dB is significant—it effectively doubles the allowable power loss, enabling longer distances or an additional level of optical splitting (e.g., moving from 1:64 to 1:128).

2. Does this module require special cooling?

This is a Commercial Temperature (0-70°C) module intended for use in climate-controlled Central Offices or exchanges. For outdoor street cabinets without air conditioning, you should select the Industrial (I-Temp) version.

3. Can I plug this into a standard 10G SFP+ switch port?

No. This is a PON OLT module designed for Point-to-Multipoint signaling. It requires a specialized OLT MAC/PHY to function and will not work in a standard Ethernet switch SFP+ port.

4. How does the “Combo” feature work?

The module contains two lasers and two detectors inside one casing. It combines the GPON (1490nm) and XGS-PON (1577nm) signals internally into a single SC connector. This allows legacy GPON ONUs and new XGS-PON ONUs to coexist on the same fiber tree.

5. What connector polish should I use?

The module interface is SC/UPC (Blue). Ensure your patch cord is SC/UPC. If your ODN uses APC (Green), use a UPC-to-APC patch cord at the OLT side to avoid damaging the transceiver.