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OLT optical module transmits optical power 32dB

ODN and passive infrastructure knowledge brief Published 06 Oct 2023

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

A GPON OLT SFP Class C+ transceiver with a 32dB optical budget supports long-distance FTTH deployments and high split ratios, providing robust 2.5G/1.25G connectivity.Key Specifications
  • Optical Budget: 32dB, which is higher than Class B+ modules (~28dB), allowing extended reach and higher split ratios .
  • Data Rates: 2.488 Gbps downstream and 1.244 Gbps upstream, suitable for GPON networks .
  • Wavelengths: 1490nm for downstream transmission (DFB laser) and 1310nm for upstream reception (APD receiver), .
  • Split Ratio Support: Reliable operation for 1:64 split ratios, enabling more subscribers per OLT port .
  • Distance Coverage: Can support up to 20 km under standard fiber conditions, with additional headroom for older cabling or higher insertion loss .
  • Standards Compliance: Fully compliant with ITU-T G.984.2 and SFP MSA standards, ensuring interoperability .
  • Diagnostics: Supports Digital Diagnostic Monitoring (DDM) per SFF-8472 for real-time health checks .
Practical Implications

A 32dB optical budget means the module can overcome higher fiber losses, including those from long distances, multiple splitters, or aging fiber. This makes it ideal for FTTH deployments in urban and suburban areas where fiber runs may exceed 20 km or require high subscriber density. The enhanced optical power also improves signal reliability and network stability, reducing the risk of service degradation.

Deployment Considerations
  • Fiber Type: Single-mode fiber is typically used for GPON networks.
  • Split Ratio Planning: Higher split ratios (e.g., 1:64) require careful calculation of optical loss to ensure all ONUs receive sufficient signal.
  • Environmental Factors: Temperature, connector quality, and splicing losses can affect the effective optical budget .
  • OLT Compatibility: Ensure the transceiver firmware and TDMA burst timing are compatible with the OLT hardware to maintain proper upstream synchronization . In summary, a 32dB Class C+ OLT optical module provides a robust solution for high-capacity GPON networks, supporting long distances, high split ratios, and reliable FTTH service delivery .

OLT optical module transmits optical power 32dB - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

OLT optical module transmits optical power 32dB

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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