Loss values ​​of a 1-to-8 optical splitter

A typical 1×8 optical splitter has an insertion loss of approximately 10.5 dB.

Understanding 1×8 Splitter Loss

A 1×8 optical splitter divides the input optical signal equally among eight output ports. In an ideal scenario, the splitting loss alone would be 9 dB (since 10×log10(8) ≈ 9 dB), but real-world splitters also have excess loss due to imperfections like core misalignment, fusion splices, and coupler inefficiencies. This brings the total insertion loss to around 10.5 dB for a quality PLC splitter, with ±1 dB uniformity across all ports .

Practical Implications

• If you input +3 dBm of optical power into a 1×8 splitter, each output port will deliver roughly -7.5 dBm in ideal conditions, or about 0.089 mW per port .
• The actual loss can vary slightly depending on wavelength (e.g., 1310 nm, 1490 nm, 1550 nm) and the specific splitter type (PLC vs. FBT), .
• For network planning, this insertion loss must be included in the total link budget, along with fiber attenuation, connector loss, splice loss, and system margin .

Summary

• Splitter type: 1×8 PLC or FBT
• Typical insertion loss: ~10.5 dB
• Uniformity: ±1 dB across ports
• Impact: Each output port receives ~12.5% of the input power
• Considerations: Always account for excess loss and include in the overall fiber link budget to ensure sufficient signal strength at the receiver . This value is standard for most 1×8 splitters used in FTTH and PON deployments, but always check the manufacturer's datasheet for precise specifications.