Optical fiber to desktop quietly approaching you (1)

Brief history of Optical Fibers

As early as 1841, Daniel Colladon of Switzerland first elaborated on the idea of transmitting a beam through a water jet. Then, through a beam in the water flow across the table, he realized light propagation in the water flow through total reflection, and created the original idea of transmitting information through optical transmission. In 1880, engineer William Wheeler lights the entire room through a series of glass tubes. In 1965, Charles Kao and George Hockham proposed the optical fiber concept of the glass ring. In 1970, Corning Glass Works in the United States made of pure Z into optical fiber. The attenuation gradually dropped from 1000dB/km to 20dB/km. At present, single-mode optical fiber with attenuation performance of 0.20dB/km is very common.

Since the beginning of 1970s, most long-distance telecommunication networks are composed of optical fibers. The optical fiber can transmit tens of billions of bits per second to dozens of kilometers away. Optical fiber is widely used in LAN trunk and will be used in desktop applications. Telecom companies and cable TV service providers pull Optical Fiber applications to their homes. In short, optical fiber has gradually become the main carrier for carrying various information and has been applied more and more.

Current Situation of fiber to desktop

Compared with optical fiber cables, copper cables are characterized by low price and simple construction. Therefore, copper is still dominant in the workspace subsystem, and the idea of "fiber-to-desktop FTTD) is still impractical" has a large market in the industry. However, we believe that the relationship between optical fiber and copper cables is indispensable in the work area. In actual use, optical fiber has its unique advantages, such as long transmission distance, stable transmission, no electromagnetic interference, high bandwidth, and no electromagnetic leakage. These characteristics make the optical fiber play an irreplaceable role in some specific environments:

1. When the transmission distance of some information points is greater than 100 meters, if you choose to use copper cable. We had to add relay or add network equipment and weak current room, which greatly increased the cost and increased the fault point. If we use optical fiber, we can easily solve this problem.

2. There are a large number of electromagnetic interference sources in certain work environments, such as factory buildings, air-conditioning data centers, and power data centers. copper cables cannot work normally. The optical fiber can transmit information in these environments without electromagnetic interference.

3. The optical fiber does not contain electromagnetic leakage. It is very difficult to detect the signal transmitted in the optical fiber. It is the best choice for users in areas with high confidentiality requirements, such as military, R & D, and auditing.

4. If the application requires a high bandwidth and the bandwidth reaches 1g or higher, the optical fiber is a good choice.

5 ,......

Due to the above reasons, fiber-to-desktop FTTD has become a trend and is used in more and more applications.

Currently, there are many FTTD solutions for optical fiber to desktop. The types of slave optical fibers can be divided:

Single-Mode Optical Fiber 9/125OS1)

Multimode 62.5/125OM1)

Multimode 50/125 OM2)

Multi-Mode 10 Gigabit 50/125 OM3) the connection between the transmission distance and the transmission bandwidth of these optical fibers can be found in the table below:

Table 1

In addition to special requirements, the customer seldom chooses Single-Mode Optical Fiber as the fiber-to-desktop FTTD solution. At present, many domestic users choose multi-mode 62.5/125OM1) as the fiber-to-desktop FTTD solution. However, the demand for bandwidth in the network is growing exponentially, from 10 M Ethernet In The Middle Of 1990s to 10 M Ethernet now, but it took about 10 years. For this reason, more and more customers are choosing multi-mode 10-Gigabit 50/125 OM3) optical fiber for fiber-to-desktop FTTD applications. This type of optical fiber can meet the current 1g bandwidth and potential needs in the future. Multimode 50/125 OM2) is rarely used in China. These types of optical fiber have little difference in the price of the optical fiber itself, and the main cost difference exists in the source equipment that is compatible with it. Generally, the price of single-mode and 10g active devices is relatively high.

Some people may think that fiber optic to the desktop is really good, but it can be deprecated in the future. However, the cabling system is a concealed project, and it plays an extremely important role in the whole weak current and information system with a certain technical foresight plan. Because the performance upgrade of the source device can be done relatively simply through software and hardware upgrades. However, the cabling system has a certain performance range, and its performance cannot be improved without replacing the cables and connectors. The concealment of the cabling system determines that the upgrade of the cabling system is interrupted and costly. What are the costs?

Cost of purchasing cables and connectors again ;?

;?

It also includes the operating costs caused by reduced network performance and reduced productivity due to cabling ;?

The cost of service interruption caused by re-construction.

In particular, the last two points are unacceptable to the vast majority of units. Therefore, we say that the cabling system should be designed with a certain degree of foresight to meet the performance requirements for the next 10 years. It is better to plan ahead than to have a headache at that time.