With the emergence of emerging technologies and services such as cloud computing, big data, Internet of Things, streaming media, and the upcoming trial commercial deployment of 5G services, network bandwidth pressures continue to increase, and operators are placing higher demands on single-fiber capacity. Compared with the currently deployed 100G system, 400G technology has the advantages of larger bandwidth, lower latency, lower bit cost and lower power consumption. It is a general trend to deploy 400G systems to meet bandwidth requirements.
In order to verify the performance of the 400G system and promote the development of the industry chain, the institute has completed the first phase test of the first single-carrier 400G OTN combined with new fiber in China, based on Corning's large effective area ultra-low loss G.654E fiber and Conventional G.652 fiber, single-carrier 400G system transmission performance test on the equipment of mainstream communication equipment manufacturers.
Single-carrier 400G is the next-generation key technology of high-speed optical transport network, which can further expand the transmission network bandwidth and reduce the cost per bit transmission. Influenced by the high-order modulation on the ONSR, the transmission distance of the 400G system is greatly limited. Technical innovations including new optical fibers are needed to improve the system OSNR and extend the system transmission distance. Considering that the optical cable line is from feasibility study to construction completion. It takes 2 to 3 years, so it is necessary to verify the transmission performance of single-carrier 400G in a new fiber environment as soon as possible. The purpose of this China Mobile 400G test is to verify the maturity of single-carrier 400G (1&TImes; 400G) technology. The test project covers key stand-alone indicators such as physical interface and board power consumption, as well as single-span and multi-span system indicators and transmission costs under G.652 and G.654E fiber types, and verify the performance of 100G/400G hybrid transmission system. .
In this test, the company introduced the TXF fiber that meets the G.654E standard.
The effective area of ​​the fiber is 120~130um2, which is 50% larger than that of the conventional 652D fiber, which can effectively reduce the nonlinear effect of the high-order modulation signal. The typical attenuation value at the 1550 nm window is 0.168 dB/km, which is 20% lower than that of the conventional G.652D fiber. The superposition of these two advantages greatly improves the transmission performance of the fiber compared to the conventional G.652D fiber, which can effectively extend the 400G. System transmission distance. In the test, Corning TXF fiber effectively meets the transmission requirements of multi-system manufacturers, single-span/multi-span models, and supports future L-band upgrades. Compared with the conventional G.652D fiber, the G.654E fiber with large effective ultra-low loss can increase the transmission distance of the system by more than 50%.
Faced with the arrival of 5G and the era of full cloud, ultra-large bandwidth has become the most basic network demand of operators. China Mobile is committed to promoting key technology standardization and cohesive industry synergy, and is the first to launch single-carrier 400G system laboratory test in China. The standardization and commercial deployment of carrier 400G technology laid the foundation and is an important link to promote the super 400G technology from the laboratory to the scale of commercial use. Corning meets the G.654E specification for large effective area ultra-low loss XF, which improves the transmission performance of 400G systems, helps operators reduce the bottleneck of 400G system deployment technology, expands the bandwidth of the bearer network, and promotes the mature commercial process of 400G systems.
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