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CSIS Seminar by Feiyang Liu

Friday, 17 March 2017

Speaker: Feiyang Liu, PhD student of Computer Science Department

Title: Wavelength Reused Optical Network on Chip (ONoC) for Many-Core Processors
Location: Room G34, Owheo Building
Date & Time: 1:00pm, Friday 17 March

Abstract: Many-core processors are becoming the mainstream platform for various high-performance computing systems. However, the enormous communication requirement between the cores makes the design of inter-core communication network a highly challenging problem. Optical Network on Chip (ONoC) is an emerging chip-scale optical interconnection technology to solve the limitations of traditional electrical interconnect by using silicon photonic devices. ONoC can achieve ultra-low communication delay, high bandwidth capacity, and low power consumption, especially through wavelength division multiplexing. However, the number of wavelengths can be used in ONoC is restricted due to hardware cost, power consumption, and reliability.

The design methodology of wavelength-reused Optical Network on Chip is explored for many-core processors, and three different wavelength-reused ONoC architectures and communication schemes are proposed to solve three widely existing communication requirements, including network scalability, multicast communication, and dark silicon. (1) WRH-ONoC combines the advantages of non-blocking communication in wavelength-router and wavelength reuse in hierarchical network. (2) DWRMR exploits dynamically established optical multicast rings for different multicast groups, and the interactive multicast communication within the same multicast group can reuse the established multicast ring through optical token arbitration. (3) Dark-ONoC periodically establishes non-blocking optical routing paths between the active cores to achieve high-bandwidth communication and low power consumption for many-core processor with dark silicon.