Two new generation optical fiber technology

In recent years, with the explosive growth of IP business volume, China Telecom is beginning to develop towards the next generation of Sustainable Development. Building a fiber-optic infrastructure with huge transmission capacity is the physical basis of the next generation of networks. The traditional G.652 single-mode optical fiber has been unable to meet the above-mentioned development needs of ultra-high-speed long-distance transmission networks. The development of new optical fiber has become an important part of the development of the next generation network infrastructure. To meet different development needs of the trunk network and man, two new types of optical fiber (non-zero dispersion optical fiber G.655) and anhydrous absorption peak Optical Fiber full-wave optical fiber) have emerged ).

1. Non-zero Dispersion Optical Fiber

The basic design concept of the non-zero dispersion optical fiber G.655 is to have a reasonable low dispersion in the 1550 window working wavelength zone, which is sufficient to support long-distance transmission of 10 Gbps without dispersion compensation, this reduces the cost of the dispersion compensator and Its appended optical amplifier. At the same time, the dispersion value remains non-zero, and the minimum value with a Code such as 2 ps/nm. above), it is sufficient to suppress non-linear effects such as four-wave mixing and cross-phase modulation. It is suitable to activate a DWDM System with sufficient wavelengths and meet the development needs of both TDM and DWDM. To achieve the above purpose, the zero-color scatter can be moved to the short-wave long side, usually 1510 ~ 1520nm range) or long wavelength side 157nm), so that the working wavelength area near 1550nm presents a certain size of dispersion value to meet the above requirements. The dispersion of a typical G.655 optical fiber in the 1550nm wavelength zone is 1/6 ~ of the G.652 optical fiber ~ 1/7. Therefore, the dispersion compensation distance is approximately 6 to of the G.652 optical fiber ~ 7 times, the cost of Dispersion Compensation includes the optical amplifier, dispersion compensator, and installation debugging) much lower than the G.652 optical fiber.

2. Full-Wave Optical Fiber

Compared with Long-Distance Networks, man is faced with a more complex and variable business environment, and must directly support large users. Therefore, it requires frequent traffic direction and bandwidth management capabilities. But its transmission distance is very short, usually only 50 ~ Therefore, the optical fiber amplifier is rarely used and the dispersion is not a problem. Obviously, in such an application environment, how to make the business volume up and down Optical Fiber most cost-effectively becomes a crucial factor in network design. Adopting high-density wavelength division multiplexing technology with hundreds of reusable wavelengths will be a promising solution. In this case, you can allocate traffic at different rates to different wavelengths to select and split the traffic on the optical path. In such applications, Developing fiber bands with the widest possible available band becomes the key. At present, the main factor affecting the available band is the water absorption peak near 1385nm. Therefore, if we try to eliminate this water peak, the available spectrum of the optical fiber is expected to be greatly expanded. Full-wave optical fiber is born under such circumstances.

Full-Wave Optical Fiber adopts a new production process, which can almost completely eliminate the Attenuation Caused by water peaks. Except for the absence of water peaks, the full-wave optical fiber is the same as the standard G.652 package-layer optical fiber. However, due to the absence of water peaks, the optical fiber can open 5th low-loss windows, bringing a series of benefits:

1) The available wavelength range is increased by nm, so that the total available wavelength range of the optical fiber is increased from about nm to nm, and the number of reusable wavelengths is greatly increased;

2) because the dispersion of the optical fiber is only half of the 155Onm wavelength, it is easy to achieve long-distance transmission with high bit rate;

3) different services can be allocated to the wavelength transmission that is most suitable for such services and network management can be improved;

4) when the available wavelength range is greatly extended, light sources, wave generators, filters and other components with wide wavelength interval, low wavelength accuracy and stability requirements are allowed, the cost of components, especially passive devices, is greatly reduced, which reduces the cost of the entire system. For more information, see the topic of Cabling Technology Network Transmission Media cable and optical fiber, or go to the discussion group.

1. Optical Fiber Technology pre-connection in cabling
2. Detailed explanation of Optical Fiber Technology and various access networks