A splice tray inside a splice enclosure exists to organize and protect each splice, keep the fiber paths within the required bend radius, and hold the fibers securely so they’re easy to access for testing or future work. By giving each splice its own channel or pocket, the tray prevents movement that could cause microbends or stress, preserves the minimum bend radius to minimize insertion loss, and provides a neat, labeled layout so technicians can inspect, test, or rework specific splices without disturbing others. It also helps with slack management and strain relief, so cables aren’t pulled or tugged when handling the enclosure. The other options don’t fit because the fusion splicer is a handheld tool used during splicing and not stored in the tray, end-face cleanliness is checked with an inspection scope, and shielding isn’t the tray’s function.

OTDRs map a fiber by sending a light pulse and watching the light that is scattered back. By measuring when that backscattered light returns, you can determine how far away events are along the fiber. The change in backscatter level over distance tells you how much loss occurs along the fiber (attenuation per kilometer), and sharp spikes in the trace indicate strong reflections from connectors, splices, or faults. What you can’t get from a standard OTDR is the fiber’s bandwidth—the data-carrying capacity or the dispersion characteristics that limit how fast you can transmit information. Bandwidth depends on the signal, modulation, and dispersion properties of the fiber and system, not on the backscattered trace the OTDR records. To assess bandwidth you’d perform transmission tests or dispersion measurements with other instruments, not an OTDR trace.

Testing attenuation in a fiber optic link is about quantifying how much signal is lost as light travels through the fiber, including losses at connectors and splices. The instrument that directly provides this quantitative loss is the optical power meter. By pairing a stable light source at the transmitter with a power meter at the receiving end, you can determine the insertion loss in decibels (dB) from the ratio of input to output power. In practical use, you may make a reference measurement at one end and then measure at the other to compute the exact loss along the link. An OTDR can show where losses occur along the fiber by analyzing backscattered light, and can estimate attenuation per segment, but its primary role is locating faults and characterizing the fiber, not giving a straightforward insertion-loss value. A visual fault locator injects visible light to help visually locate breaks or high-loss areas but does not provide a numeric attenuation measurement. An optical spectrum analyzer examines the spectral distribution of light, not the overall attenuation of the fiber link.

The steps for preparing fibers before fusion splicing should be performed in a clean, logical sequence to ensure a high-quality splice. Start by removing the buffer coating from the fiber, so you’re working with bare glass. Then clean the bare fiber to remove any oils or debris that could cause contamination. Inspect the fiber for defects such as cracks or scratches, because flaws can lead to higher splice loss or failure. Next, cleave the fiber to produce a perpendicular, flat end face, and inspect the cleave to confirm it’s clean and square. Finally, load the prepared fiber into the splicer so the ends can be accurately aligned and fused. This sequence matters because each step sets up the next: stripping first exposes the glass surface for proper cleaning, cleaning ensures a true, uncontaminated end, a good cleave minimizes mismatch at the junction, and loading into the splicer after these checks maximizes the chance of a low-loss, reliable splice. Skipping or reversing steps would risk contamination, defects, or a poor end-face, degrading splice quality.