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Ten technology trends of optical communication system in the next five years

Writer:Fctel    Time:2019-05-06 15:22     Browse:

   1、 Silicon photonics technology
    Due to the separation of light and electricity, photonics and electronic technology follow their own development routes. At present, optical communication systems are facing bottlenecks in terms of power consumption, cost and integration.
Silicon photonic technology uses CMOS microelectronic technology to realize the integrated fabrication of photonic devices. This technology combines the characteristics of super large scale logic and ultra-high precision manufacturing of CMOS technology with the advantages of ultra-high speed and ultra-low power consumption of photonic technology. It is a disruptive technology that can solve the contradiction between long-term technology evolution and cost.
At present, a number of key technologies of silicon photonics have been broken through one after another, and are expected to start commercial use within three years.
    2、 With the integration of cloud and big data technology, optical communication SDN enters the era of 2.0
    SDN is recognized as the development trend of optical communication. By introducing an open architecture with the separation of control and forwarding, it can significantly improve the network capability, and has begun to be gradually deployed in the existing network. However, with the gradual deployment of SDN and the continuous increase of network traffic, the deployment flexibility, data storage, processing capacity, security and network stability of SDN controller / application will be greatly challenged.
    In the next 3-5 years, SDN technology will enter the era of 2.0. The open network architecture of SDN will be combined with cloud and big data technology to deploy control and application in the way of cloud. The main characteristics of SDN 2.0 will be to analyze and predict traffic with big data technology. Through the introduction of the above technologies, we can realize the security and elastic deployment of SDN solutions, ensure the high requirements of SDN for data storage and data processing, and predict the trend of network traffic in multiple dimensions, so as to further enhance the intelligence and agility of the network, and ensure the customer experience in the large traffic environment.
    3、 Beyond 100g, single channel transmission rate continues to improve
    100g optical transmission is difficult to meet the network bandwidth requirements of emerging services such as video, cloud computing, big data and Internet of things in the future. The smooth upgrade of over 100g optical transceiver unit in the existing network can double the system capacity, which has high cost performance and feasibility.
    Super 100g will inherit and carry forward the design idea of 100g optical transmission, improve the utilization and spectrum efficiency of optical fiber spectrum resources while maintaining the same transmission distance, and introduce advanced modulation coding and optoelectronic integration technology to further reduce the unit bit cost.
    At present, the industry is actively opening the demonstration network experiment, promoting the business process of over 100g, and is expected to take the lead in the application of data center interconnection.
4、 High speed access, multi-dimensional multiplexing and coherent Technology
    New Internet applications emerge in endlessly, which need more bandwidth to support the data demand of blowout growth. Government and enterprise major customers and high-end community users will need to enjoy the exclusive wavelength at home. In some scenarios, there will be the demand for long-distance, high bandwidth and low delay access.
    The multiplexing dimension of optical communication technology includes time division, wavelength division, frequency division, code division, module division and so on. At present, 40g PON adopts time division multiplexing and wavelength division multiplexing, which is one of the feasible ways of 100gpon. The industry will explore the combination of the above more dimensions to provide users with greater bandwidth. In addition, the coherent receiving mode is adopted at the receiving end, which can carry more than 1000 wavelengths in one fiber, 1g / 10g per wavelength, and the passive transmission distance can reach 100km, realizing T-bit access. To provide users with greater bandwidth, lower delay access services, to provide operators with efficient and low operation and maintenance costs of the network.
    40g twdm-pon will start its commercial journey in five years, and more dimensional multiplexing and coherent technologies are also research hotspots.
5、 Simplify the complexity, deeply integrate IP and optical network, improve the super capacity routing
    At present, the communication network uses multi-layer and multi domain network to carry services, and there are many kinds of equipment. The packet processing capacity of massive data is improved exponentially. At the same time, the higher and higher requirements are put forward for the super large capacity routing operation capacity, which leads to the shortage of room space, high energy consumption and low efficiency. The integration of IP and optical network is one of the effective ways to solve the problem.
    The integration of IP and optical network can be realized through the unified switching kernel technology, with the packet / ODUk / VC centralized switching function, so as to reduce the network level, save the network investment, reduce the maintenance cost, and realize the network node intensification. By improving the forwarding capability of single slot line card and adopting multi frame cluster technology, the forwarding capability of single node can be greatly improved; Through multi-core processor, distributed software architecture, modular management and other technologies, we can realize the management of ten million level routing table.
    IP and optical convergence covering backbone, convergence and access networks, super large capacity routers with tens of millions of routing entries, and end-to-end solutions for the whole network are provided. Operators have launched pilot projects.
6、 Flexible optical switching, building next generation optical network based on cdc-f characteristics
    At present, with the large-scale deployment of 100g technology and the vigorous development of ultra-100g technology, the transmission capacity of WDM / OTN system has improved rapidly. Flexible scheduling and efficient processing of optical layer has become an important demand of optical network nodes.
    With the further improvement of the integration of WSS optical modules, the optical cross networking technology with cdc-f (colorless, directionless, contentionless, flex grid) characteristics constructed by WSS optical modules is easy to build flexible, high-speed, low-power, low latency and other key features when applied to super large network nodes Efficient optical network.
    Optical cross technology with cdc-f characteristics has been paid more and more attention by operators all over the world. At present, some operators have taken the lead in deployment, and it is expected to launch a wider range of pilot and commercial applications in the near future.
7、 Open to create value, optical communication network app technology popularization
         
    The traditional optical network is relatively closed and lacks the ability to provide network management and control to external users. With the rapid development of cloud computing, big data and data center, the demand for management and control of optical network is more and more intense.
In the era of SDN, operators and equipment manufacturers creatively provide their own developed apps or SDKs for external users to develop apps. These apps and SDKs use the open northbound interface of SDN controller to manage and control the optical network, and realize the functions of service creation, service QoS adjustment, network planning, network optimization, etc., so as to innovate the business mode, simplify the network application, and improve the network utilization efficiency and operation and maintenance efficiency.
    In recent years, some friendly and interactive optical network apps have won the favor of users. In the future, open SDN optical network will breed more and more valuable apps.
8、 High efficiency and low cost, medium and short distance Metro high speed transmission direct adjustment and direct inspection technology
    In order to meet the requirement of long distance transmission in backbone network, coherent transmission technology is the mainstream transmission technology. But in the network between cities, the transmission distance is often less than 300 km. In this case, how to avoid the use of coherent detection (complex system, high cost), to achieve good transmission and networking effect, is now a hot topic.
    In order to realize medium and short distance transmission, the current main technologies mainly consider direct modulation and direct detection. In terms of modulation, there are many ways to use, including: pam-4 transmission mode, DMT transmission mode, single sideband transmission mode, and so on. On the receiving side, incoherent mode is adopted, and less optoelectronic devices are used. In order to simplify the system and reduce the cost.
In recent years, a number of direct adjustment and direct inspection technology experiments have been carried out continuously. Through gradual research and continuous optimization, the pilot will start in the next three years.
9、 Towards all-optical network, optical interconnection technology from chip to board to machine room
    With the rapid development of big data and cloud technology, large-scale data exchange and processing from chip to chip, from cabinet to data center are eager for high-speed, stable and reliable interconnection, which conventional cable connection will not be able to cope with.
    At present, the solution between chips and boards can use silicon-based optoelectronic integration to realize optical interconnection effectively. The main solutions include silicon-based optoelectronic integration, high-speed VCSEL and direct tuning DFB. The silicon-based optoelectronic integration scheme has the advantages of CMOS process compatibility, high integration and low cost.
In the next few years, optical interconnection technology will be widely used in chip interior, chip room, board room, cabinet room and machine room.
10、 Green communication, the eternal theme of optical communication technology
    With the continuous increase of information consumption, optical communication needs to provide more and more bandwidth and consume more and more energy. In today's increasingly tense energy, how to achieve green communication has become one of the main directions of the industry.
In order to realize green communication, some new technologies are being or will be gradually adopted, such as new energy, high integration chip, high efficiency power module, intelligent fan, liquid refrigeration, intelligent flow aggregation, hardware dormancy, new materials and so on.
    Through the gradual introduction and continuous optimization of the above technologies, the energy consumption per bit of optical communication equipment will be gradually reduced and more harmonious with the environment.
    Source: fiber online, strategic frontier technology

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