my country's FTTH/O users have reached 261 million, covering about 1 billion users, exceeding the number of users in Europe and the United States combined; global mobile users have exceeded 6.3 billion, my country's mobile users have reached 1.36 billion, and mobile broadband users have reached 1.163 billion.
“These achievements are based on optical communication. More than 95% of the world’s information is transmitted through optical communication. Visible light communication is an irreplaceable technology.
” Wuhan Post and Telecommunications Mao Qian, former vice president and chief engineer of the Academy of Sciences, honorary director of the Optical Communications Committee of the China Communications Society, and director of the Asia-Pacific Optical Communications Committee, recently stated at the "2017 Optical Communications Technology and Development Forum".
400G will gradually be put into pilot in 2018
From the field test of the first optical transmission system in 1975 to the present, optical The transmission network has gone through stages such as PDH, SDH, ASON, MSTP, PTN, and POTN on the technical route, and has developed into the evolving SDON/T-SDN.
In terms of transmission rate, the optical transmission network has gradually increased from 8MBit/s to 34M, 140M, 565M, 2.5G, 10G, and now 100G, which has been widely used.
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With the rapid development of 4K, 8K, VR, AR, the Internet, mobile Internet, and the Internet of Things, the continued growth of transmission capacity and new and diverse transmission characteristics further promote optical transmission technology Applications and innovations.
With the large-scale deployment of 100G, beyond 100G has gradually entered people’s field of vision.
At present, the industry has paid attention to the beyond 100G technology in many aspects such as modulation and demodulation, device limitation and non-linear damage compensation, new optical fiber and low noise amplification, etc. Through continuous research, diversified technologies have been introduced into Beyond 100G, and spectrum efficiency and transmission distance have been further improved.
Zhang Haiyi, director of the Technology and Standards Research Institute of the China Academy of Information and Communications Technology, pointed out that the current standardization of super-100G is progressing steadily and will be completed in early 2018. The optical modules of corresponding rate interfaces are gradually mature. It is expected that super-100G will be launched in 2018. Gradually put into pilot and small-scale applications.
In Beyond 100G, commercial products for 200G and 400G high-speed transmission still have the coexistence and competition of multiple optional code types, which require a compromise between transmission distance and spectrum efficiency. Single carrier 400G Research popularityTo improve, equipment vendors and operators have conducted 400G tests, and a small number of trial commercial systems have been launched. 400G has become one of the application options for next-generation backbone network transmission.
As for the G.654E optical fiber that is currently hotly debated in the industry, Mao Qian believes that G.654E optical fiber has a significant impact on the establishment of ultra-high-speed systems and existing systems. Compatibility is of great significance, but the G.654E optical fiber process is difficult and the yield is lower than that of standard single-mode optical fiber, which keeps the price high and affects large-scale promotion and application.
The attenuation coefficient of G.652D optical fiber is also constantly decreasing.
In Mao Qian’s view, in actual networks, G.652D optical fiber is still widely used. G.654E optical fiber is only used in necessary scenarios and will not completely replace G.652D optical fiber.
Cost is one of the factors in technology commercialization
Innovation is the key to the continued rapid development of optical communications.
Mao Qian believes that in the next 5-10 years, optical communication technology will enter a new round of reform and rapid development.
“Ultra-high speed, ultra-large capacity, ultra-high spectral efficiency, ultra-long distance, ultra-low loss, ultra-low cost” are the rigid requirements of optical networks. Optoelectronic integration, SDN/NFV and cloudification are the key requirements of optical networks. The three major elements of evolution, ultra-high speed, IP, optoelectronic integration and siliconization, intelligence and openness are the development trends of optical networks.
It has become a general trend for optical networks to enter "P-bit level transmission", and new multiplexing technologies to further enhance optical fiber transmission capacity are development directions worth exploring.
"100Tbit/s is the limit of single-fiber transmission At the limit, space division multiplexing (SDM) is the main technology for improving optical fiber transmission capacity in the future and has become a research hotspot in the industry. Although some progress has been made, SDM still has bottlenecks in key technologies such as multiplexing devices and fiber amplification. , the specific future commercial use is still unclear.
" Zhang Haiyi pointed out.
Silicon photonics is also an important trend in optical transmission networks. In the long run, silicon photonics has greater Good development prospects.
Authoritative research institutions predict that the silicon photonics market is expected to grow from US$40 million in 2015 to US$6 billion in 2025, and the chip market will reach US$1.5 billion.
The silicon photonics industry chain is constantly being built. Currently, more than 20 companies have launched related silicon photonics products, and new products have continued to make breakthroughs in the past two years.
Relevant teams are still working hard to pursue innovation.
“However, the light-emitting technology of pure silicon has not been fundamentally solved, making large-scale integration of a single silicon chip still difficult; at the same time, the volume determines the price, and the price also determines whether silicon photonics can be widely used. important factors in application.
" Mao Qian pointed out.
