![]() ![]() The SM fiber only transmits the main mode, that is, the light only transmits along the axis of the fiber, which completely avoids the dispersion and the waste of optical energy. So if only G.652 is specified, it means the performance specification of G.652A, which should be paid special attention to. At the same time, as G.652D is the latest index of SM fiber, it is the most stringent index of all G.652 levels and is fully downward compatible. The main parameters of 1310nm SM fiber are determined by ITU-T in G652 proposal, so this kind of fiber is also called G.652 fiber.Īs mentioned above, due to the absorption of OH, there are optical loss peaks in the range of 900nm ~ 1300nm and 1340nm ~ 1520nm, which are called water peaks. And it is also the main working wavelength of practical optical communication system. Therefore, 1310nm wavelength region has become an ideal working window. From the optical loss characteristics of an optical fiber, 1310nm is just a low loss window. ![]() It is found that the total dispersion of the single-mode fiber is zero at 1310nm. That is, the spectral width should be narrow and with better stability. As a result, single mode fiber has higher requirements for the spectral width and stability of the light source. Therefore, the intermodal dispersion is very small, which is suitable for remote communication.īut there are also material dispersion and waveguide dispersion. SM fiber has a very thin core, and only one mode of light can be transmitted. Table 1: Application of multimode optical cable Fiber Optical Cable SM Cable Transmission distance of 10 Gigabit Ethernet (M) Transmission distance of Gigabit Ethernet(M) Therefore, these 2 ranges are not fully utilized. Loss tends to increase with a wavelength of 1650nm and above.īecause the absorption of OHˉ (water peak), there are optical loss peak in the range of 900nm ~ 1300nm and 1340nm ~ 1520nm. While 1550nm has a generally 0.20dB/km optical loss, which is the lowest loss of optical fiber. The loss at 850nm is generally 2.5dB/km, at 1310nm is generally 0.35dB/km. Optical loss of fiber is generally reduced with the increase of wavelength. Working WavelengthĪt present, the mostly working wavelengths of fiber are 850nm, 1310nm and 1550nm. ![]() The diameter of the core of single mode fiber is 9μm, outer diameter of cladding is 125μm. So, a multimode optical fiber is often described as 50/125μm or 62.5/125μm. The core diameter of multimode fiber is 50 or 62.5μm, and it has an outer 125μm cladding. Keep reading to know them once for all! Optical Fiberįiber can be divided into single mode and multimode according to the mode of optical transmission. So, what’s their differences, and which one to choose when I need a fiber optic cable? HOC (Hone Optical Communications) has 19+ years of experience on optical communication and ODN. We all know there are single mode (SM) and multimode (MM) for optical fiber. ![]()
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