Several Single-Mode Optical Fibers

G.652 Single-Mode Optical Fiber
The single-mode optical fiber that meets the requirements of ITU-T.G.652 is often called non-dispersion displacement optical fiber. Its zero dispersion is located in the Low Loss zone of 1.3um window, and the working wavelength is 1310nm loss is 0.36dB/km ). The vast majority of optical fiber cables already laid in China are such optical fiber cables. With the successful development of optical fiber and semiconductor laser technology, the working wavelength of optical fiber lines can be transferred to a 1550nm optical fiber window with a lower loss of 0.22dB/km.
G.653 Single-Mode Optical Fiber
A single-mode optical Fiber that meets the requirements of the ITU-T.G.653 is often called the Dispersion displacement Optical Fiber DSF = Dispersion Shifled Fiber), and its zero Dispersion wavelength is shifted to 1550nm where the loss is extremely low. This type of optical fiber is widely used in some countries, especially in Japan. It is also adopted on the Beijing-9th trunk line in China. AT&T found that DSF was seriously inadequate in the early days. There were harmful four-wave mixing and other non-linear effects in the low dispersion zone near 1550nm, which hindered the application of the Fiber Amplifier in the 1550nm window. However, in Japan, applying Dispersion Compensation Technology * To G.653 single-mode optical fiber lines still solves the problem, and there is no G.655 optical fiber in Japan.
G.655 Single-Mode Optical Fiber
A single-mode optical Fiber that meets ITU-T.G.655 requirements, often known as a non-zero Dispersion displacement optical Fiber or NZDSF = NonZero Dispersion Shifted Fiber ). Dispersion displacement optical fiber, but the dispersion at 1550nm is not zero according to the ITU-T.G.655, the dispersion value corresponding to the wavelength of 1530-1565nm is 0.1-6.0 ps/nm. it is used to balance non-linear effects such as four-wave mixing. Product optical fiber is like AT&T's TrueWave optical fiber, Corning's SMF-LS optical fiber has a typical zero-dispersion wavelength value of 1567.50nm, a typical zero-dispersion value of 0.07 ps/nm2.km) and Corning LEAF optical fiber. China's "dabaoshi" optical fiber.
LEAF Optical Fiber
Single-mode non-zero dispersion displacement optical Fiber with the commercial name LEAF = Large valid tive Area Fiber), which operates at a 1550nm window, has a Large "Effective Area" compared with the standard non-zero dispersion displacement optical Fiber ", therefore, it is suitable for the network with high output power mixed with bait fiber amplifiers (EDFA) and Dense Wavelength Division Multiplexing (DWDM.
Band Cable
The optical fiber cables are made from multiple single optical fiber cables by coloring, stacking into bands and secondary plastic bands. The optical fiber has two types: encapsulation and edge adhesive. The former can withstand horizontal pressure and the latter has a thinner thickness. Each band can contain 4, 8, 12, or 16 optical fibers. The inband Optical Fiber spacing is 28mm mm for 4, 8) and 3mm mm for 12 and 16). The cables are arranged neatly and the flatness is required in the vertical direction, the value must not be greater than 30, 40, or 50um based on the number of in-band optical fibers), so that the cluster can be connected. The in-band optical fiber uses Chromatography in an orderly manner, which facilitates identification during maintenance and connection. The small size of the optical fiber Band can increase the density of the optical fiber in the optical fiber cable, which can constitute a large number of cores, such as 320 to 3456 cores. It is applicable to the rapidly developing optical fiber access network.
Full-Media Self-bearing Optical Cable
ADSS = All Dielectric self-support (ADSS) optical fiber cables. The tensile strength element is not a metal, but a nylon yarn and glass fiber reinforced plastic FRP ). It is mainly used in scenarios with strong electric power, such as power grids and railway communication systems, and in large cross-distance scenarios such as cross-river crossing or complex terrain. The ADSS optical cable can be used for non-power-stop construction, withstand electrical marks, and has a wide temperature range.
Ground Compound Optical Cable
OPGW = Optical Power Grounded Waveguide (OPGW), also known as Optical fiber Overhead Ground Wires. The cables in Power transmission lines contain Optical Fiber units for communication. This type of optical fiber cable is completely dual, that is, the Electrical and Mechanical Properties of the ground wire are not damaged by the setting of the optical fiber, and the optical fiber unit must be properly protected and not damaged. There are several types of cables, such as lead skeleton, stainless steel pipe, and submarine cable.
Submarine Cable
Optical fiber cables laid on the bottom of the sea, with applications in the shar and deep sea. One advantage of this optical cable is that it is able to withstand a large amount of hydrostatic pressure. The pressure increases by 10 MB per depth to 1 ton .) And the drag force during the casting process; the second is to prevent hydrogen from interfering with the optical fiber. It has been confirmed that hydrogen will lead to increased attenuation of the optical fiber, and the third is the large cross-distance of the relay segment. Fiber optic units in submarine cable are placed in the center of the cable and in an authoritarian stainless steel tube. The steel wire of the High-strength arch outside the pipe. The steel wire layer is covered with a copper tube for long supply, which makes no micro/macro bending occur when laying the optical cable. Then squeeze the outer sheath. It may also be sold out to prevent sharp damage, including shark bites. The submarine cable has landed in Shanghai, Qingdao, and Shantou.