Title: High-speed optical interconnects and high-efficiency optical networking technologies

 

Technical Area: Networking

 

Background

Fast growing cloud computing services and big data applications require huge data exchange between machines, processors, memories and storage not only within a datacenter, but among datacenters located in different regions as well. The overall computation power of datacenters is largely determined by the communication speeds between different machines and chips in datacenters, including serve-to-server, processor-to-memory (storage) and chip-to-chip interconnect speeds. With the increase of speeds, optics will penetrate into shorter and shorter reaches. Today most of interconnects outside servers use optical technologies, and optical interconnects may get inside servers in 5-10 years. Meanwhile, bandwidth demand for inter-datacenter interconnects in metro, terrestrial long-haul and submarine networks grows rapidly as well. Large-capacity, high-speed and low-power-consumption optical interconnect technologies including short-reach interconnects and long-haul transport networking technologies will be a key for high-performance datacenters and cloud computing services.

 

For short-reach optical interconnects, there is a high requirement on bandwidth density, cost and power consumption. Today, 100G is widely employed with a 3.2Tb/s/RU (rack unit) bandwidth density, and 400G will be deployed in 2 years with a 12.8Tb/s/RU bandwidth density. It is challenging to go beyond 400G with the current pluggable transceivers based on discrete components. Photonics integration and further opto-electronic integration are regarded as one of the promising technologies for high-speed optical interconnects. These includes silicon-photonics and III-V based photonic integration technology, photonic and electronic co-packaging technology, et al. Today the capacity of optical transport systems is close to fundamental limit, Shannon Limit, with the single mode fiber capacity reached 30 Tb/s and 100 Tb/s in commercial and experimental systems respectively. But the traffic still keeps growing exponentially, with no sign of slowing down. There is an urgent need to develop new technologies to increase the capacity of optical transport networks.

 

Target

1. To explore and investigate Tb optical transceiver technology and high density optical engine technology for intra-datacenter interconnects that have the potential to increase the speed and bandwidth density by more than 5 times compared with current technologies

 

2. To explore and investigate high-capacity and low-cost optical transmission system technology and high-efficiency and intelligent optical transport network technology that have potential to reduce the cost of optical transmission systems by more than 5 times and increase the efficiency of optical networks by more than 5 time compared with current technologies.

 

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