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Replacing copper with light

The train of time moves forward slowly, and things in the world change quietly. People twenty years ago would never have imagined the speed of social development today, just as people today cannot predict their lives twenty years from now.

Twenty years have changed people’s entertainment and travel methods, as well as countless people’s perception of the world. It is difficult for children today to understand the bitterness of the previous generation’s telephone dial-up Internet access, and children twenty years later may not understand that we use “stuck and slow” network cables and WiFi routers to access the Internet.


Compared with the technology of ten or twenty years ago, the network cable WiFi router is not bad, but compared with the technology that will be popularized in the future, the network cable WiFi is like the dial-up Internet access in the past, with slow speed and poor stability, which is difficult to meet people’s needs. . And this technology, which is about to replace the network cable WiFi, is the core of the second optical fiber revolution, the whole house gigabit technology.

Replacing copper with light, from entering the house to entering the room

Modern life is inseparable from WiFi, but few people understand the source of WiFi signals. In fact, today 94% of home network signals come from fiber to the home, and only 6% of homes still use copper wire to enter the home.

More than ten years ago, my country’s fixed broadband access mainly adopted copper broadband technology represented by ADSL, which can provide a starting bandwidth of 512K, and above 2M will face considerable pressure. In 2016, Shanghai Telecom announced the official launch of the gigabit broadband scale promotion plan. It was the first time in the country to propose a plan to realize “gigabit Internet access” in the whole city, and the first “optical fiber revolution” was launched. By 2018, 10 million households in Shanghai will achieve full coverage of fiber -to-the-home, and bid farewell to copper broadband.

In the field of communication, the frequency characteristics and modulation technology of the transmission medium are the most important, and the transmission medium is the cable material. The frequency of single-mode optical fiber made of optical fiber is around 35THz, while the frequency of copper dielectric cables is between 100MHz and 1000MHz. Even the highest frequency Cat7e network cable has a bandwidth capacity of only 1/35,000 of that of optical fiber.


In addition, optical fiber has long transmission distance, low attenuation, strong reliability, and is not susceptible to electromagnetic interference and crosstalk. Since the popularization of FTTH, the experience of fixed-line broadband users in China has been greatly improved. Now, we use the network cable to surf the Internet at home, and rarely encounter stuttering and disconnection, and the effect of replacing copper with light is remarkable.

Unfortunately, the plan cannot keep up with the changes. With the popularization of the mobile Internet, mobile devices such as mobile phones and tablets have become mainstream Internet terminals. Fixed broadband speed and stability are solved, but WiFi networks are not so easy to solve.


fiber optic cable

For various reasons, copper medium network cables are still the mainstream of home internal network cables. The well-known five types of network cables, six types of network cables, and seven types of network cables are essentially copper medium network cables. In other words, from the backbone network of the operator to the city network to the household weak current box, all use optical fiber network cables. On the contrary, the backward copper medium network cables are still used inside the home. The core of the second optical fiber revolution is to replace copper with light in the home, so that high-bandwidth and high-reliability optical fiber networks can be directly connected to every corner of the home, and completely solve the problem of WiFi network stability.