Hello, everyone!
Today, I would like to share with you the Second part article on FTTH-PON networks – Technology.
Splitting can happen in 2 or even more steps. As shown in Figure 1, the very first 1:4 splitter may feed 4 apartment buildings, while a second splitter in each building does the final splitting into subscriber drops.
Figure 1. Fiber splitting is done in two stages on a PON that covers four apartment blocks.
Although such a setup is versatile and saves money on cables, the cumulative loss of two splitters is more than that of a single similar device (see representative splitter specifications in Table 1).
Table 1. Fiber splitter insertion loss: (a) theoretical value estimated for equal power distribution across ports and (b) actual data of commercial splitters for the 1260–1650 nm range.
Passive optical networks, in general, have three problems that P2P networks do not have:
a. Table 1 shows a high insertion loss of the splitter that rises with the split ratio.
b. OLT bandwidth is shared across all ONTs in a PON.
c. Each ONT has a different transmission latency.
You are welcome to leave a message and exchange in the comment area. Thank you!
