The vast majority of telecommunication companies develop broadband access mainly by ADSL, however, ADSL is a broadband access technology based on copper wire, copper is a worldwide strategic resource, and as the international price of copper cable continues to climb (an average annual increase of 20%-30% in recent years), the line cost of copper-based ADSL is getting higher and higher, while the raw material of optical fiber is silica, which is inexhaustible in nature It is inexhaustible.
The current market price of optical fiber is already lower than that of ordinary copper wire, and its life span is much higher than that of the latter. In new customer lines or old cable replacement, fiber optics has become a more reasonable choice, especially the backbone section and even the wiring section. Secondly, as an active device, ADSL electromagnetic interference is difficult to avoid and the maintenance cost is getting higher and higher. As a passive transmission medium, optical fiber can avoid such problems.
As the fiberization process of the whole network continues to extend to the user side, the limitation of end-to-end broadband connection is increasingly concentrated in the access section, and the upstream and downstream connection rate of ADSL cannot meet the long-term service demand of high-end users. Although ADSL2+ and VDSL2 technologies are expected to alleviate this pressure, the continued substantial increase in its rate and transmission distance is limited, and an essential breakthrough cannot be expected. Obviously, with the massive application of optical fiber in the long-distance network, metro network and even the backbone section of the access network, the logical development trend is to continue to extend optical fiber to the wiring section and the introduction line part of the access network, and eventually realize the fiber to the home.
