China's optical fiber cable technology status

In recent years, optical fiber communication technology has made great progress, and new technologies have emerged continuously. This has greatly increased the communication capabilities and allowed the application of optical fiber communications to expand.

1. Ordinary optical fibers Ordinary single-mode optical fibers are the most commonly used optical fibers. With the development of optical communication systems, optical relay distance and single wavelength channel capacity increase, the performance of G..652.A optical fiber may be further optimized, and the low attenuation coefficient in the 1550 rim region is not fully utilized and optical fiber. The lowest attenuation coefficient and zero dispersion point are not in the same area. The cutoff wavelength shifted single-mode fiber conforming to ITUTG.654 and the dispersion shifted single-mode fiber complying with the G..653 specification achieve such an improvement.

2. Core network cables China has adopted fiber optic cables on trunk lines (including national trunk lines, intra-provincial trunk lines, and intra-area trunk lines) in China. Among them, multimode optical fibers have been eliminated and all use single-mode optical fibers, including G..652 fibers and G..652. .655 fiber. Although G..653 fiber was used in China, it will not be developed in the future. The G..654 fiber has not been used in China's terrestrial cable because it can not greatly increase the fiber system capacity. The discrete optical fiber is used in the trunk cable, and the optical fiber tape is not used. Mainline cables are mainly used outdoors. In these optical cables, the tight-jacketed tiered and skeleton structures that have been used in the past have been discontinued.

3. The distance of the optical cable in the access network optical fiber cable access network is short, the branch is more, and the inserting and inserting is frequent. In order to increase the network capacity, the number of optical fiber cores is usually increased. Especially in the city pipelines, due to the limited inner diameter of the pipe, it is important to increase the optical fiber assembly density of the optical cable and reduce the diameter and weight of the optical cable while increasing the number of optical fibers. The access network uses G..652 common single mode fiber and G..652.C low water peak single mode fiber. Low-water peak single-mode fiber is suitable for dense wavelength division multiplexing and is currently used in small quantities in China.

Indoor fiber-optic cables Indoor fiber-optic cables often require the simultaneous transmission of voice, data, and video signals. And it may also be used for telemetry and sensors. The author thinks that the indoor optical cable referred to by the International Electrotechnical Commission (IEC) in the category of optical fiber cables should include at least two parts of the optical fiber cable used in the office and the integrated wiring. The office optical fiber cloth is placed in the central office or other telecommunication rooms, and the deployment is closely ordered and the position is relatively fixed. In combination with cabling, the optical fiber cable is placed in the user's room and is mainly used by the user. Therefore, its vulnerability should be more strictly considered than that of the office optical cable.

5. Communication cables in power lines Optical fibers are dielectrics, and optical cables can also be made full-medium, completely free of metals. Such an all-dielectric fiber cable will be the most ideal communication line for the power system. There are two types of all-dielectric fiber cables used for laying power line poles: the all-media self-supporting (ADSS) structure and the winding-type structure used on overhead ground wires. ADSS fiber optic cable has been widely used in the transformation of China's power transmission system because it can be deployed alone and has a wide range of adaptability. The recent demand for ADSS fiber optic cables in China is a hot product at present.