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C Optical Module Output Power

Fiber and communications infrastructure knowledge brief Published 16 Apr 2025

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

The output optical power of a C++ GPON SFP module typically ranges from +6 dBm to +10 dBm. C++ GPON SFP modules are designed for medium to large GPON networks, where longer transmission distances or higher splitting ratios are required. The higher transmitter power of +6 to +10 dBm allows these modules to support splitting ratios up to 1: 128, making them suitable for connecting more ONTs to a single OLT port compared to C+ modules, which have lower output power of +3 to +7 dBm.

Comparison with Other GPON ClassesC+ Modules: Output power +3 to +7 dBm, suitable for shorter distances and smaller networks, supporting up to 1: 64 splitting ratio. C++ Modules: Output power +6 to +10 dBm, ideal for medium to large networks, supporting up to 1: 128 splitting ratio. C+++ Modules: Output power +7 to +11.

5 dBm, designed for large-scale networks with extended reach and highest splitting ratios.

Additional Considerations

Receiver Sensitivity: C++ modules generally have excellent receiver sensitivity, often around -28 dBm, ensuring reliable signal reception over long distances. Applications: These modules are commonly used in GPON OLTs for FTTx deployments, supporting asymmetric upstream (1. 244 Gbps) and downstream (2.

488 Gbps) transmission over single-mode fiber up to 20 km. Digital Monitoring: Many C++ modules support Digital Optical Monitoring (DOM) to track real-time operating parameters, including optical output power, temperature, and voltage. In summary, C++ GPON SFP modules provide higher optical output power than C+ modules, enabling longer reach and higher subscriber capacity, making them a preferred choice for medium to large GPON deployments.

C Optical Module Output Power - CJC FIBRE CONSULTANTS [PDF]

C Optical Module Output Power

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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