A 1:32 splitter divides input power by ~32 (adding ~15dB of insertion loss), so the remaining power supports signals up to 20km. Splitters are essential when you want one fiber line from a central office (like an ISP's headend or data center) to serve multiple homes or businesses. Imagine a tree. A split ratio describes how many output ports a splitter has, and how evenly the input optical power is distributed across those ports. Its single-fiber bidirectional transmission mechanism employs WDM, where downstream traffic adopts broadcast mode (1490nm wavelength), and upstream traffic uses TDMA. If we have measured gains in linear units (e. in Watts – W), the loss value in dB is calculated by the formula: Loss (dB) = 10 lg ( mW1 / mW2 ) When both gains are equal, the loss is 0 dB, so there is no loss (doesn't happen obviously). If the distance between the OLT and ONT is small (in 5 km), you can consider about 1:64. Every time you double the ports, you double the signal paths — and the theoretical loss grows by about 3 dB.
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