What is the power rating of a telecommunications optical splitter
Telecommunications optical splitters are passive devices with no electrical power requirement; their “power rating” refers to the optical input power they can handle and the output power per port, which is determined by the split ratio and insertion loss.
Passive Operation and Power Handling
Optical splitters are passive components used in PON networks to divide a single optical signal from an Optical Line Terminal (OLT) into multiple outputs for Optical Network Terminals (ONTs) without requiring any electrical power . The power rating is not in watts of electrical energy but in terms of optical power budget, which is the difference between the OLT transmit power and the minimum receiver sensitivity of the ONT, minus losses from the splitter and fiber .
Split Ratios and Insertion Loss
The split ratio (e.g., 1:2, 1:4, 1:8, 1:16, 1:32, 1:64) determines how the input optical power is divided among output ports. Each doubling of the split ratio typically reduces the output power by approximately 3 dB . For example, a 1:32 splitter reduces the input power by roughly 15 dB across each output port. Splitters can be uniform, distributing power equally, or non-uniform, where outputs receive different power levels, often custom-designed .
Typical Optical Power Ratings
- OLT Transmit Power: Usually ranges from +3 dBm to +5 dBm for GPON or EPON modules.
- Splitter Loss: Calculated as 10 × log₁₀(N), where N is the number of outputs. For a 1:32 splitter, the theoretical loss is about 15 dB, with practical losses slightly higher due to insertion loss.
- Maximum Split Ratios: EPON can support up to 1:64, GPON up to 1:128, depending on the optical module and link budget .
- Transmission Distance: Typical PON distances are up to 20 km, with higher split ratios requiring higher OLT power or more sensitive ONTs to maintain signal quality .
Summary
The power rating of an optical splitter is defined by its ability to handle the optical input from the OLT and deliver sufficient power to each ONT after accounting for splitter loss and fiber attenuation. It is influenced by the split ratio, insertion loss, and network design, rather than electrical power. Proper selection ensures reliable PON operation, adequate bandwidth per subscriber, and compliance with the optical power budget .
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