Hello, everyone!
Today, I would like to share with you a First part article on FTTH-PON networks – Technology.
In 1987, British Telecom suggested the notion of a passive optical network (PON) to reduce the requirement for fibers and splicing, both of which were expensive at the time.
Despite lowering prices of optical fiber cables, this argument holds true because the passive infrastructure of a typical FTTH network accounts for 35–45 percent of the entire cost.
As seen in Figure 1, there are no active devices between the site containing OLT equipment and subscriber premises in a PON, thus the term "passive."
Figure 1. FTTH-PON access network connections and wavelengths (GPON).
Wavelengths are determined by the PON system (Table 1).
The delivery of TV signals in analog format is a possibility.
Table 1. FTTH-PON systems are assigned wavelength bands (values in [nm]).
Using a passive, spectrally nonselective, and compact fiber splitter, the single feeder fiber coming from the OLT optical port is passively split into several (8–64) drop fibers extending to each ONT.
Optical distribution network refers to the entire passive fiber network between an OLT and a set of ONTs (ODN).
Splitting feeder fibers reduces the amount of feeder fibers, splicing expenses, and duct area required for feeder cables. Duct space is limited in most places, and the construction of additional cable ducts is sluggish and costly.
Because savings increase as the distance between the CO and the supplied residential area grows, major operators interested in consolidating their access infrastructure into fewer facilities may choose FTTH-PON.
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