A Flexible, High-Performance FPGA Implementation of a Feed-Forward Equalizer for Optical Interconnects up to 112 Gb/s

作者：Maragos Konstantinos^*; Spatharakis Christos^*; Lentaris George; Kontzilas Panagiotis^*; Dris Stefanos; Bakopoulos Paraskevas; Avramopoulos Hercules; Soudris Dimitrios

来源：Journal of Signal Processing Systems for Signal Image and Video Technology, 2017, 88(2): 107-125.

DOI：10.1007/s11265-016-1201-y

• FPGAs
• Optical interconnects
• Feedforward equalization
• Parallel architectures
• 112 Gb/s
• Datacenters

Commodity optoelectronic components and multi-level modulation formats are combined nowadays in optical networks to increase their throughput while decreasing their cost. To overcome the inherent limitations of such interconnects, research focuses on digital equalizers that compensate for the effects of the developed channels. The current paper proposes the use of FPGAs to enhance the speed, power and flexibility of digital equalization for the next generation 100 Gb/s rack-to-rack optical links in datacenters. We present the high-performance hardware architecture of a flexible feed-forward equalizer (FFE) with multiple reconfigurations. We describe parallelization techniques to accelerate FFE, accuracy analysis for various FFE scenarios, as well as a design space exploration leading to a fine-tuned and platform-dependent FFE customization. Our final implementation on a single Xilinx XC7VH580T FPGA device with GTZ transceivers can support a single link of up to 112 Gbps (56 GSa/s with PAM-4 modulation) and 2.26 . 10(-6) Bit-Error-Rate.

• 出版日期2017-8