XGS-PON & GPON Combo OLT SFP-DD Transceiver | Class B+ MPM Module

Overview

Streamline your network upgrade with the GPON XGS-PON Combo SFP-DD OLT Module (Class B+). This Multi-Protocol Module (MPM) is the ideal solution for service providers looking to introduce 10G broadband services while maintaining support for existing GPON subscribers on the same fiber infrastructure. Utilizing the high-density SFP-DD (Double Density) form factor, this module plugs directly into next-generation OLT line cards, saving valuable rack space and reducing power consumption.

The module is rated as Class B+, providing a standardized optical power budget suitable for typical urban deployments with split ratios of 1:64 over 20km. By integrating four distinct wavelengths into a single optical interface, it enables simultaneous upstream and downstream communication for both 10G XGS-PON and 2.5G GPON, allowing for a gradual, subscriber-by-subscriber migration to higher speeds without disrupting the rest of the network.

Key Features

• Dual-Rate Operation: Supports GPON (ITU-T G.984) and XGS-PON (ITU-T G.9807.1) concurrently.
• Form Factor: SFP-DD (Small Form-factor Pluggable Double Density) with dual-row electrical interface.
• Optical Class B+: Standard power budget (~28dB) for cost-effective network overlays.
• Wavelength Management:
  • XGS-PON: Tx 1577nm / Rx 1270nm
  • GPON: Tx 1490nm / Rx 1310nm
• Integrated WDM: Built-in filtering separates 10G and 1G traffic internally.
• Connector: Simplex SC/UPC receptacle.
• Diagnostics: Full DDM/DOM support for monitoring optical output and sensitivity.

Applications

The Class B+ Combo SFP-DD is designed for Brownfield FTTx deployments where operators need to overlay 10G services onto an existing ODN. Key use cases include:

• Mixed Service Areas: Delivering Gigabit services to homes (GPON) and 10-Gigabit services to businesses (XGS-PON) on the same PON tree.
• High-Density OLTs: Upgrading capacity in space-constrained street cabinets or central offices using SFP-DD ports.
• Cost-Sensitive Migrations: Providing a lower-cost alternative to Class C+ modules for networks with standard reach and split requirements.

Specifications

Cross-Platform Compatibility

This SFP-DD Combo Module follows MSA standards for electrical and mechanical interfaces, ensuring compatibility with major OLT vendors supporting the MPM architecture:

Advantages

Choosing the Class B+ version of the Combo SFP-DD offers a strategic advantage in scenarios where the extra power of Class C+ is unnecessary. It provides the same dual-rate capability and high density but at a more accessible price point, making it perfect for standard distribution networks (1:32 or 1:64 splits). It eliminates the need for external WDM combiners (WDM1r), simplifying cable management and reducing insertion loss in the central office.

FAQ (Technical & Product Questions)

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

The main difference is the optical power budget. Class B+ typically supports a budget around 28dB (good for 1:64 splits), while Class C+ offers a budget around 32dB (good for 1:128 splits or longer distances). Choose based on your network’s loss characteristics.

2. Can I plug this SFP-DD module into a standard SFP+ port?

Physically it might fit, but it will not function correctly. SFP-DD has two rows of electrical pins to handle the extra bandwidth and control signals for the dual-channel operation. It requires a dedicated SFP-DD cage.

3. Do I need to upgrade my ONUs?

Only for subscribers upgrading to 10G. Existing customers can keep their GPON ONUs. New customers requesting higher speeds will receive an XGS-PON ONU. Both will connect to this same OLT module.

4. Does this module support OLT protection switching?

Yes, it supports standard Type B protection switching protocols if supported by the OLT chassis and network topology.

5. Is the connector SC/APC or SC/UPC?

This OLT module uses an SC/UPC (Blue) connector. Please ensure your fiber patch cord in the central office is also SC/UPC to avoid high return loss and damage.