Introduction: At present, in the 100G scale deployment, application and development of 400G and 1T – 100G technology is also on the agenda. At present, including telecom operators, optical fiber and cable manufacturers, the parties are actively exploring, ultra low loss large effective area of new land for optical fiber technology, 400G.
The rise of the Internet network, mobile Internet, networking, making data Flow grow with each passing day, optical transmission network The capacity is continuously challenged. At present, in the 100G The scale of deployment, application and development of 400G and 1T – 100G technology is also on the agenda. The industry generally believes that the broadband network in the context of continuous improvement, Optical fiber As the cornerstone of innovation network also need to speed up the pace of development, provide strong support for the optical transmission network upgrade. At present, including telecom operators and optical fiber and cable Manufacturers, the parties are actively exploring, ultra low loss large effective area of new land for optical fiber technology, 400G.
The new fiber paving the way for the 400G
The arrival of the era of 400G, put forward higher requirements on the existing network. This means not only need to improve the equipment performance, the development of new optical technology, also means that the industry needs to find a more suitable for large capacity, long-distance transmission of optical fiber. China Telecom Science and Technology Commission Director Wei Leping recently said in public, the backbone is the steady evolution, in 2013, the largest network link passage capacity reached 12T, 100G began large-scale deployment and become the leading technical backbone network. By 2017, the maximum passage capacity will reach 46T, 400G began to demand. For 400G over 100G network, reduce the loss of the optical fiber is the ultimate way out. China Unicom Wang Guangquan, director of Institute of network technology, network technology research department believes that in the 100G and 100G era, the nonlinear effect of optical fiber attenuation and become a major constraining factor in improving the performance of transmission system. He said, in the face of the arrival of the 400G era, the industry needs to actively explore new fiber optical cable Technology.
At present, increasing the fiber effective area, reduce the fiber attenuation has become the main direction of the development of new fiber technology. The mainstream manufacturers are actively developing related products, in order to enhance the Optical network The transmission performance of the system, to provide strong support to extend the transmission distance. Wang Guangquan said, at present Chinese Unicom for the 400G/1T system has launched a new type of optical fiber transmission performance experiment Room test, while still in the East and west of the existing network deployment pilot. Experiments show that, based on the existing fiber network (G.652 and G.655 fiber), realize the mainstream radio relay transmission distance is short 400G and 1T system, at the same time through the use of large effective area fiber, increase of the input optical power, can extend the transmission distance, significantly improve the transmission performance of the system.
In the future of a new type of optical fiber, G.654 fiber has become the focus of land. G.654 is the deadline wavelength The displacement of the single-mode fiber, it is divided into four sub categories from the A/B/C/D standard, before is mainly applied to submarine cable. The beginning of July 2013, ITU began to discuss the land with the G.654E subclass, is expected to be completed in September 2016 the relevant standards. However, the land application of G.654 fiber is also facing some challenges. Wang Guangquan thought is mainly embodied in four aspects: one is the cutoff wavelength of the potential impact on OSC; two is the effective area increase effect on Raman amplification; three is the engineering environment will face problems, compared to seafloor application environment more complex, at the same time, cable protection ability is weak; four is it not only exists in the same compatibility. Between the optical fiber, G.654 and G.652 compatibility is also a problem.
The construction period and long life of optical network, a very large investment, so the introduction of new fiber, telecom operators to uphold the cautious attitude, hope foundation fully verified in as far as possible, make scientific decisions. According to Wang Guangquan said, China Unicom will continue to promote new fiber validation work in the two-year period, collect performance data, network test, focus on the differences in the cable attenuation; compared with the G.652 and G.654 properties of optical fiber, optical fiber can be used to verify the new land energy and environmental adaptability; at the same time, the network also the G.652 and G.654 to carry out 400G based testing, validation of different fibers into the fiber optical power, and validation of the G.654 optical fiber transmission performance.
The mainstream manufacturers active layout
In the face of the upcoming 400G era, in addition to the system equipment manufacturers, optical fiber and cable manufacturers are also actively layout, accelerate the pace of new fiber research, in order to seize the initiative. YOFC in the April 2015 meeting of the fortieth session of the American Optical Fiber Communication Exhibition and Conference (OFC), released near Bei Chaoqiang (FarBand Ultra) ultra low attenuation of G.654 fiber, the products meet or exceed G.654.B standard ITU-T. After the improvement and optimization of more than one year, the typical value was reduced from 0.165dB/km to 0.158dB/km G.654 fiber 1550nm super bainite YOFC far attenuation, and is better than that of G.657.A1 standard macro bending properties and excellent micro bending performance.
In fact, YOFC early in 2012 began the development of ultra low attenuation optical fiber G.654, launched in 2013 2014 to achieve a level of pilot experiment, the key technology breakthroughs, the product release in 2015. R D center general manager Wang Ruichun YOFC revealed this information in the recently held new fiber-optic cable technology innovation and industrial application forum. He said that the Yangtze is the worlds top three, the only with ultra low attenuation optical fiber products enterprises. He believes that 400G is the key technology of next generation optical transmission system, and ultra low attenuation fiber effective area is the best choice of 400G/1T land application.
In the face of 400G fiber is toward two directions, one is to reduce the attenuation, the other one is to enhance the effective area. In the opinion of the chief engineer of the Jiangsu Hengtong Optical Fiber Technology Co Ltd Chen Wei, the industry has reached a consensus on the development of ultra low loss fiber effective area on. Under this trend, prosper relying on its own technical research and development capabilities, launched a large effective area G.654 ultra low loss optical fiber, which is the first single independent development of the original ultra low loss single-mode fiber with large effective area, especially for 100G and 400G with high speed and large capacity optical fiber communication system design of high-tech products. At present, Hengtong ultra low loss large effective area G.654 fiber products have entered the network test China unicom. He also said that in the face of the future commercial scale, G.654 fiber performance and cost is a very important factor, there are two aspects of this prosperity continued to improve, to prepare for the future of the commercial scale.
Zhongtian Technology are actively deploying 400G technology deployment. The traditional G.652 fiber can not meet the 400G long distance optical transmission system requirements, Zhongtian Technology Precision Materials Co. chief technology officer Jiang Xinli told the newspaper reporters, attenuation, effective area and bending loss is the next generation of line three important indexes of optical fiber, in considering the price under the condition of low loss optical fiber G.654 is the best choice for 400G system. He said, at present, ZTT has mastered the core technology of low loss, large effective area of the optical fiber, optical fiber and cable market at the bottom of the sea by means of technology accumulation and deployment experience, Zhongtian Technology in G.654 optical fiber land will also have a certain advantage. He judged that the next 2~3 years, low loss, large effective area fiber products will become more and more mature, although still unable to reach the current level of G.652 fiber, but the scale of the application will not be a problem.
