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

At present, with the advent of the generation-by-generation communication technology, the communication industry is developing faster and faster. What is the trend of optical communication system in the next five years?
1、 Silicon photon technology
Due to the separation of optical and electrical technology, photon and electronic technology follow their own development path. At present, optical communication system has encountered bottlenecks in power consumption, cost and integration.
Silicon photon technology uses CMOS microelectronics technology to realize the integrated preparation of photon devices. This technology combines the characteristics of CMOS technology such as super large scale logic, ultra-high precision manufacturing and the advantages of photon technology such as ultra-high speed and ultra-low power consumption. It is a subversive technology that can solve the contradiction between long technology evolution and cost.
At present, several key technologies of silicon photons have been broken through one after another, and it is expected to start commercial use within three years.
2、 Integrating with cloud and big data technology, optical communication SDN enters the 2.0 era
SDN is recognized as the development trend of optical communication. By introducing the open architecture of separation of control and forwarding, it can significantly improve the network capacity, and has been gradually deployed on the current network. However, with the gradual deployment of SDN and the continuous increase of network traffic, the flexibility of SDN controller / application deployment, data storage, processing capacity, security and network stability under large traffic 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 analysis and prediction of traffic with big data technology will become the main characteristics of SDN 2.0. Through the introduction of the above technologies, we can realize the safe and flexible 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 improve the intelligence and agility of the network, and ensure the customer experience in a large traffic environment.
3、 Beyond 100g, single channel transmission rate continues to increase
100g optical transmission is difficult to meet the network bandwidth requirements of emerging services such as video, cloud computing, big data, Internet of things, etc. The smooth upgrade of over 100g optical transceiver unit in the current network can double the system capacity, with high cost performance and feasibility.
Super 100g will inherit and carry forward the design idea of 100g optical transmission, improve the utilization rate and spectral efficiency of optical spectrum resources while keeping the transmission distance unchanged, and introduce advanced modulation coding and photoelectric integration technology to further reduce the unit bit cost.
At present, the industry is actively developing 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 an endless stream, which need more bandwidth to support the data demand of blowout growth. Large government and enterprise customers, high-end community users will need to have exclusive wavelength access, as well as long-distance, high bandwidth and low delay access in some scenarios.
Multiplexing dimensions in optical communication technology include time division, wavelength division, frequency division, code division, mode division, etc. At present, 40gpon adopts two-dimensional multiplexing of time division and wavelength division, which is also one of the feasible ways of 100gpon. The industry will explore the combination of these more dimensions to provide users with greater bandwidth. In addition, coherent reception mode is adopted at the receiving end, which can carry more than 1000 wavelengths in a single optical fiber, 1g / 10g per wavelength, and the passive transmission distance reaches 100km, realizing T-bit access. Provide users with access services with larger bandwidth and lower delay, and provide operators with efficient and low operation and maintenance cost networks.
40gtwdm-pon will start its commercial journey in five years, and more dimensional multiplexing and coherent technologies are also the research hotspot.
5、 Reduce complexity to simplicity, deeply integrate IP and optical network, and improve super capacity routing
At present, the communication network adopts multi-layer and multi domain network to carry business, and there are many kinds of equipment. The packet processing capacity of massive data is improved exponentially. At the same time, it puts forward higher and higher requirements for the routing operation capacity of large capacity, which leads to the shortage of space, high energy consumption and low efficiency in the computer room. 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 by unified switching core technology, which has packet / ODUk / VC centralized switching function, so as to reduce network level, save network investment, reduce maintenance cost, and realize network node intensification. By improving the forwarding ability of single slot line card and adopting multi frame cluster technology, the forwarding ability of single node can be greatly improved; by using multi-core processor, distributed software architecture, modular management and other technologies, the route table management of tens of millions level can be realized.
Covering IP and optical convergence of backbone, convergence and access networks, super capacity routers with tens of millions of routing table items provide end-to-end solutions for the whole network, and operators have launched pilot projects.

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