400G commercial need ultra low loss optical and opto-electronic hybrid cross

August 31 to September 2, the 17th China International Optoelectronic Exposition was held in Shenzhen, in the "2015 optical communication networks and technology innovation and development" thematic clubs held on September 1, the China Mobile Research Institute Network Technology Research Institute deputy director Li Han published "400G technology development and application of" special reports operators.

The development of business-driven trunk bandwidth rapid growth, 2012-2014 CMNET traffic increased by more than 100 percent per year, is expected to increase by the end of 2017 but also 7-15 times; backbone transmission network traffic by 30% -50% annual growth rate in recent It could double in a year. Specifically, as of 2014, China Mobile provincial backbone bandwidth of more than 80T, 2015 years will add 200T, China Mobile is currently building the world's largest 100G transmission network, and started to introduce ASON function. 100G show its superiority in the opening time, cost, power consumption, etc., more CMNET lay the foundation for development.

Opto-electric hybrid cross will become the future direction

Currently 100G OTN electrical cross-networking into the mainstream, opto-electric hybrid crossover also become the future direction of development, the introduction of photovoltaic hybrid cross, enabling businesses in a light layer of transparent transmission, to reduce cost and power consumption. But opto-electric hybrid cross to get the application must resolve performance testing, automated planning and layer synergy between other issues, which is critical in OTN applications SDN.

DC became the focal point for future traffic, the traditional network architecture challenges. Lee Han said China Mobile will be in DC for the core network construction, should face DC design, enhance DC traffic to divert to something. In addition, the 100G Internet era, the policy transport network protection needs to re-examine the introduction of ASON protection and restoration.

Ultra-low loss optical fiber demand urgent

Currently there are dual-carrier 400G and four-carrier scheme in which dual-carrier PM-16QAM modulation scheme is the industry's mainstream. Lee Han frankly, compared to 100G long-distance transmission system (about 3000km) need 5-6dB OSNR margin, currently 400G in the current network transmission margin is about 600km 2-4dB, still can not meet the long-distance trunk transmission needs. 400G PM-16QAM based on the current level of technology and current network conditions, such as to achieve 1000km transmission, you need a lot of aspects of the room, fiber, amplifiers, equipment upgrade for change.

At present, in the optical fiber field, Ultra-low loss and large effective area + Ultra-low loss represents the future direction of the optical fiber. Lee Han pointed out that the cost of cable construction giant, once laying is difficult to change, are strategic investments, fiber optic conduit at least need to consider the needs of the next 20 years, which means that today the deployment of optical fiber is bound to have the ability to ultra-low loss.

But the chain is weak, less commercial products, consider the deployment of a small amount of ultra-low-loss optical fiber network, to verify the performance of the existing network, and promote the development of the industry chain.

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