Splitter failures occur primarily due to mechanical stress and environmental influence, not spontaneous optical breakdown. When splitter modules are mounted without adequate strain relief, tension transfers to internal fiber joints, gradually shifting alignment and increasing. Fiber optic splitters distribute optical power from one input fiber to multiple output fibers through either fused biconical taper (FBT) coupling or planar lightwave circuit (PLC) waveguide structures. Their performance depends on optical symmetry, waveguide integrity, and mechanical stability of. Optical splitters in the outside plant (OSP) are used mostly in passive optical networks (PONs) for fiber-to-the-user (FTTx) networks, and are often overlooked as failure points. The split ratio and insertion loss are two key parameters defining their performance. A deeper understanding of these. · Splitter Loss: In networks utilizing passive optical splitters, splitting the signal leads to an inherent loss which needs to be carefully managed. To address these challenges, SDGI. While PLC devices are valued for their compact size, precision, and ability to split light evenly across multiple channels, the issue of PLC splitter loss continues to draw scrutiny. Higher-than-expected fiber splitter loss can impact signal quality, reduce transmission distances, and ultimately. Analysis of the causes of faults, faults in the operation of FTTH technology in wired networks can be considered from two aspects.