GPON OLT SFP Transceiver | Class B+ | 2.5G/1.25G | 40km Long Reach

Overview

The GPON OLT SFP Transceiver (Class B+, 40km) is a high-performance optical module designed for extended-reach Gigabit Passive Optical Networks (GPON). While standard GPON deployments are typically limited to 20km, this enhanced module is engineered to support link distances of up to 40km (depending on split ratio), making it an ideal solution for rural broadband and low-density FTTx architectures.

Compliant with ITU-T G.984.2 standards, it delivers asymmetric data rates of 2.488 Gbps downstream and 1.244 Gbps upstream. This module is specifically coded for compatibility with major OLT platforms, including Huawei, allowing seamless integration into existing Central Office equipment.

Key Features

• Extended Reach (40km): Optimized optics allow for transmission distances double that of standard GPON modules, perfect for connecting remote subscribers.
• Class B+ Optical Budget: Provides a standard optical budget (typically ~28dB) while utilizing high-sensitivity receivers to maintain link stability over longer fibers.
• Asymmetric Bandwidth: Delivers 2.5G download and 1.25G upload speeds, complying with standard GPON service tiers.
• SFP Form Factor: Standard Small Form-factor Pluggable design with an SC/UPC connector interface.
• DDM Support: Integrated Digital Diagnostic Monitoring allows operators to check temperature, voltage, laser bias, and optical power levels in real-time.

Applications

• Rural FTTH: Extending fiber services to outlying communities where the distance from the Central Office exceeds 20km.
• Low-Density Networks: Ideal for deployments using lower split ratios (e.g., 1:16 or 1:32) to maximize distance coverage.
• Network Backhaul: Connecting remote OLT extenders or mini-OLTs in a cascading architecture.
• Surveillance Networks: Long-distance fiber links for IP camera systems requiring GPON topology.

Specifications

Cross-Platform Compatibility

This module features versatile MSA-compliant EEPROM coding. It is rigorously tested for compatibility with industry-leading OLT chassis, serving as a reliable alternative for:

• Huawei: MA5600T, MA5800 Series (GPBD, GPFD boards)
• ZTE: C300, C320 Series (GTGO, GTGH boards)
• Nokia/Alcatel-Lucent: 7360 ISAM FX
• FiberHome: AN5516 Series

Technical Note on 40km Reach

Achieving 40km on a GPON network involves a trade-off between distance and split ratio. Standard GPON (Class B+) is designed for 20km at a 1:64 split. To achieve 40km with this module, the split ratio should typically be reduced (e.g., to 1:32 or 1:16) to conserve the optical budget for fiber attenuation loss (~0.35dB/km).

FAQ

1. Can I use this 40km module with a standard 1:64 splitter?

It depends on the total fiber distance. If you are running the full 40km, a 1:64 split (which introduces ~18dB loss) combined with 40km of fiber attenuation (~14dB) would exceed the Class B+ budget. For 40km runs, we recommend a maximum split of 1:16 or 1:32.

2. Is this compatible with Huawei MA5608T?

Yes, this SFP is fully compatible with the Huawei MA5600T series, including the MA5608T, provided it is installed in a GPON service board like the GPBD or GPFD.

3. How does this differ from Class C+?

Class C+ modules have a higher optical budget (~32dB) compared to Class B+ (~28dB). Class C+ is better suited for high split ratios (1:128) or long distances with high splits. This specific “40km B+” module is an optimized B+ transceiver designed for reach, but it still fits within the B+ power class definition.

4. Does it work with third-party ONUs?

Yes, the OLT transceiver follows the ITU-T G.984 standard. It will communicate with any standard-compliant GPON ONU/ONT (Huawei, ZTE, Nokia, Ubiquiti, etc.), provided the OLT system software allows the ONU registration.