Q: What is acceptable loss in fiber optics? A: For singlemode fiber, loss should be under 0. Q: How do I know if fiber loss is too high? A: Compare your results with standard loss limits. High readings mean connectors, splices, or bends need. When testing fibre optic cabling, determining acceptable loss is crucial. This depends on various factors, including who is conducting the test and the phase of the project. Recognizing what constitutes too much loss is essential. Check total loss, power margin, and feasibility clearly. Real-world fusion splices typically achieve 0. 05 dB rated), and quality LC connectors often measure 0.