Requirements of Optical Fiber for the Next Generation Transmission Technology
In the bandwidth hungry and data flow driven by explosive growth, high speed optical 100G transmission line technology has spread in the global scope. Super 100G technology also launched pilot projects in many countries and regions. As the most basic part of the fiber optic network, optical fiber has a new development.
At the same time, especially early fiber generation backbone has been out of service length, which need to be updated in a large scale. Considering the effective support 20 years lifetime service capacity and the network infrastructure changes to minimum, the choice of optical fiber type needs to be strong forward-looking.
With the rapid development of data communication and network, network point to point, online applications and video business has shown explosive growth, large amount of digital media content has led to the rapid growth of Internet traffic appears ten times or even a hundred times, which led to the telecommunications backbone traffic every year is the rapid rate of growth to 50%-80%, caused by operation business bandwidth costs continue to increase, industry parties, to promote the whole network capacity to meet business demand growth and reduce the transmission cost per bit.
The 100G system has been in the major operators quickly commercial, 400G system can be used in 100G on the basis of further improve the capacity of the network and reduce the transmission cost per bit, effectively solve the business flow and the bandwidth of the network operators are facing increasing pressure, is expected around 2017 will also gradually began to commercial.
Research shows that, in the 100G system of common G.652D fiber, low loss and low loss optical fiber can transmit distance of more than 1000km; ultra low loss can prolong the link distance 35-40%, some lines can reduce the relay station, for all-optical network construction; in some with about ~100km long distance optical system put in section, ULL (ultra low loss optical fiber cross section) can effectively reduce the loss.
400G transmission system has brought problems such as OSNR limited, noise and nonlinear, which have restrictions on the transmission distance. From the current mainstream equipment manufacturers to the test results, the transmission distance 400G system with dual carrier and modulation technique of 16QAM only 100G system about 1/3, so the construction of high-speed system needs to consider the system capacity and transmission distance.
From the angle of the line side transmission equipment, can use the multi carrier light source, high order modulation, coherent detection, high-speed DSP system and error correction technology to promote the development of commercial high-speed optical transmission system, optical fiber links from the point of view, ULL fiber can improve the systems of OSNR and effectively extend the transmission distance, which can reduce the use of electric relay, optimization of the network structure, saving the construction cost.
The new standard Corning ULL/Ultra fiber definition
ClearCurve, which was launched by Corning in 2007, established a single-mode optical fiber bending standard. Its SMF-28 ULL fiber and SMF-28 fiber Ultra also defines the new standard adaptation of next generation transmission technology.
As one of the latest release of two products launched by Corning in 2013, SMF-28 Ultra optical fiber is attenuation currently on the market first and leading value and fiber excellent macro bending performance, at the same time to meet the G.652D and G.657A1 specifications. The optical fiber mode field diameter is 9.2 μm, and the standard single-mode fiber mode field diameter is the same. It is compatible with the Corning SMF-28e and SMF-28e+ fiber.
The low loss characteristics of SMF-28 Ultra can effectively extend the transmission distance, expand the light put regeneration station between the span and increase the cable repair times, also can make some pre link scheme has been applied more widely. At the same time, it provides excellent macro bending performance of bending more redundant for installation and operation, also can make the cable design is more compact and lightweight, cable laying, can reflect the advantage such connection box is smaller in the pipeline, and reduce the negative pole, tower high school laid heavy.