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A Synthesis Method Based on Multi-Stage Optimization for Power-Efficient Integrated Optical Logic Circuits

Ryosuke MATSUO, Jun SHIOMI, Tohru ISHIHARA, Hidetoshi ONODERA, Akihiko SHINYA, Masaya NOTOMI

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Summary :

Optical logic circuits based on integrated nanophotonics attract significant interest due to their ultra-high-speed operation. However, the power dissipation of conventional optical logic circuits is exponential to the number of inputs of target logic functions. This paper proposes a synthesis method reducing power dissipation to a polynomial order of the number of inputs while exploiting the high-speed nature. Our method divides the target logic function into multiple sub-functions with Optical-to-Electrical (OE) converters. Each sub-function has a smaller number of inputs than that of the original function, which enables to exponentially reduce the power dissipated by an optical logic circuit representing the sub-function. The proposed synthesis method can mitigate the OE converter delay overhead by parallelizing sub-functions. We apply the proposed synthesis method to the ISCAS'85 benchmark circuits. The power consumption of the conventional circuits based on the Binary Decision Diagram (BDD) is at least three orders of magnitude larger than that of the optical logic circuits synthesized by the proposed method. The proposed method reduces the power consumption to about 100mW. The delay of almost all the circuits synthesized by the proposed method is kept less than four times the delay of the conventional BDD-based circuit.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E104-A No.11 pp.1546-1554
Publication Date
2021/11/01
Publicized
2021/05/18
Online ISSN
1745-1337
DOI
10.1587/transfun.2020KEP0018
Type of Manuscript
Special Section PAPER (Special Section on Circuits and Systems)
Category

Authors

Ryosuke MATSUO
  Kyoto University
Jun SHIOMI
  Kyoto University
Tohru ISHIHARA
  Nagoya University
Hidetoshi ONODERA
  Kyoto University
Akihiko SHINYA
  NTT Nanophotonics Center,NTT Basic Research Laboratories
Masaya NOTOMI
  NTT Nanophotonics Center,NTT Basic Research Laboratories

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