GPON OLT SFP Transceiver | Class C+++ (High Power) | 2.5G/1.25G 20km

Overview

The GPON OLT SFP Class C+++ Transceiver is a high-performance optical module designed for Gigabit Passive Optical Networks (GPON) requiring extended optical power budgets. Distinguished by its Class C+++ rating, this module delivers higher transmit power and receiver sensitivity than standard Class B+ or C+ modules, making it the ideal solution for networks utilizing high split ratios (up to 1:128) or overcoming significant insertion loss in complex fiber distributions.

Compliant with ITU-T G.984.2 specifications, this single-fiber bidirectional transceiver operates at 2.488 Gbps downstream and 1.244 Gbps upstream. It features a hot-pluggable SFP footprint with a Simplex SC/UPC connector, ensuring compatibility with most major OLT platforms.

Key Features

• High Power Output (Class C+++): Enhanced optical budget (~35dB) supports higher split ratios (1:128) and longer reach.
• Data Rate: Asymmetric 2.488 Gbps Tx / 1.244 Gbps Rx.
• Wavelengths:
  • Transmit (Downstream): 1490nm (DFB Laser)
  • Receive (Upstream): 1310nm (APD/TIA Burst Mode)
• Reach: Up to 20km over Single Mode Fiber (SMF).
• Connector: Simplex SC/UPC.
• Diagnostics: Built-in Digital Diagnostic Monitoring (DDM).
• Standards: ITU-T G.984.2, RoHS Compliant.

Applications

• High-Density FTTH Networks: Perfect for deployments requiring 1:128 optical splitters to maximize OLT port utilization.
• Extended Reach Deployments: Overcomes attenuation in older fiber plants or networks with multiple patch points.
• Rural Broadband: Provides the extra power margin needed for long-distance last-mile connections.

Technical Specifications

Class C+ vs. Class C+++

While standard Class C+ modules offer a budget of roughly 32dB (suitable for 1:64 splits), Class C+++ modules push the envelope with budgets closer to 35dB. This extra margin is critical for service providers looking to double their subscriber density per PON port by using 1:128 splitters, or for networks where the fiber infrastructure has higher than average attenuation.

FAQ

1. What does “Class C+++” mean?

In GPON standards, classes define the optical power budget. Class B+ is standard (28dB), Class C+ is high performance (32dB). “Class C+++” (or sometimes C++) is a vendor-enhanced standard indicating even higher transmit power and sensitivity, typically allowing for 1:128 split ratios.

2. Can I use this module with existing GPON ONUs?

Yes, this OLT module is fully compatible with standard GPON ONUs (Optical Network Units). The higher power simply ensures the signal is strong enough to reach them through high-split splitters.

3. Does this support Digital Diagnostics (DDM)?

Yes, the module supports DDM/DOM, allowing administrators to monitor parameters like optical output power, input power, temperature, and voltage via the OLT CLI.

4. Is an attenuator needed for short distances?

Because this is a high-power Class C+++ module, if you are testing it on a bench or connecting to an ONU with very short fiber (e.g., < 500m) without a splitter, you must use an optical attenuator (e.g., 15-20dB) to avoid damaging the ONU’s receiver.