As early as 2016, the 100G OTN network of the three major domestic operators has been quite perfect, and 100G has become the mainstream of trunk transmission, and gradually expands to the local network.
That is to say, in 2016, there have been many discussions about 400G in China, and even the test has already started. There is no doubt that the use of 400G in the backbone network is an inevitable choice, and some experts are expected to arrive between 2019 and 2020.
Ultra low loss large effective area G. 654. E fiber is the best choice for 400G/1T systems, with ultra-low attenuation, large effective area and excellent macro-bending and micro-bending performance under specific processes to meet the needs of complex environment deployment.
ITU-TG. 654. E International standards were completed and released in September 2016, led by China Unicom. 654. E industry standards have also been finalized.
It is reported that in early August 2017, China Unicom invited the trial network to participate in the organizers to organize a summary seminar, unanimously agreed that G. 654. E fiber optic land application performance is excellent, the use of land and complex replacement parts, is the preferred fiber for 400G long-distance transmission. Therefore, G. 654. E-fiber is the main fiber used in the construction of China Unicom's next-generation backbone network.
At the “2017 National Science and Technology Awards Conferenceâ€, the “New Fiber Preparation Technology and Industrialization†project jointly announced by China Unicom and Changfei Company won the second prize of National Science and Technology Progress Award. It is understood that the project for the first time clearly stated that the large effective area is the main factor to improve the transmission performance of ultra-high-speed systems such as 400G, fully demonstrating G. 654 fiber optic land application feasibility.
In early May 2018, China Unicom stated that it would organize G. 654. E fiber is used for technical finalists and is intended to be applied in the construction of interprovincial optical cable trunking projects. 654. E fiber optic cable, launched in 2018. 654. Bidding procurement of E fiber optic cable.
In addition, China Unicom launched a new fiber transmission performance laboratory test for the 400G/1T system in 2016, and also deployed a live network pilot in Shandong and Xinjiang: two 400G optical cables were built in Xinjiang and Shandong, respectively. Hami is 140 kilometers long to Balikun, and Shandong is 420 kilometers long from Jinan to Qingdao.
In April 2018, Shandong Unicom built the first 400G wave sub-ring of China Unicom in Jinan. At present, Shandong Unicom has planned to deploy a 10-wave dual-carrier 400G in Jinan. The dual-carrier 400G solution used in the current network can coexist with the 100G channel. It is only necessary to expand the 400G channel to upgrade the existing network 100G to the 400G system, which can effectively alleviate the pressure of the slot and channel resources, and finally achieve full network coverage.
However, Tang Xiongyan, chief expert of China Unicom Network Technology Research Institute, pointed out that there are two major challenges in the deployment of 400G systems: First, in the era of 100G and 100G, CD/PMD is no longer the main limiting factor, and nonlinear effects and fiber attenuation become The main factors of system transmission performance; Second, balancing the spectrum effect, transmission distance and system capacity and cost under the limit of Shannon limit is a key issue for 400G application deployment.
China Mobile: Dual carrier has 400G commercial single carrier 400G in the testChina Mobile has already surpassed China Unicom in the second place in the fixed-line market and is approaching China Telecom. Therefore, the deployment of the super 100G network is more active.
As early as 2014, China Mobile completed the first domestic dual-carrier 400G (2&TImes; 200G), four-carrier 400G (4&TImes; 100G) laboratory test and live network pilot.
In 2017, it also clearly included the dual-carrier 400G into the province's collection and bidding scope, and took the lead in launching the single-carrier 400G system test, actively promoting the 400G process from the laboratory to the commercial scale, and finally took the lead in realizing dual-carrier 400G commercial use in China. Metro transmission scenario.
At the beginning of this year, China Mobile Research Institute organized the first domestic single-carrier 400G technology laboratory test, which mainly verified the performance and function of single-carrier 400G system. The important equipment manufacturers in the industry, Huawei, ZTE, Fiberhome, and Nokia's 400G devices participated in the 400G equipment. This test. This is an important part of pushing the super 400G technology from the laboratory to the scale of commercial use.
China Telecom: Local test in live networkZhang Chengliang, vice president of China Telecom Beijing Research Institute, pointed out at the "World Fiber Optic Cable Conference 2017" that the use of 400G in the backbone network is an inevitable choice and is expected to arrive between 2019 and 2020.
In fact, as early as 2014, China Telecom has clearly set up a new 400G bin in the collection, which means that China Telecom has introduced 400G routers in scale.
At present, China Telecom's news about 400G is not too much. It is basically local news. For example, in April 2017, Fiberhome Communications and Shanghai Telecom completed the WSS based on WTS in the country's largest and most complex local network, Shanghai Telecom OTN II. All-optical scheduling 400G live network test.
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