Programmable Logic Array (PLA) is an important building circuit of VLSI chips and some of the FPGA architectures have evolved from the basic PLA architectures. In this letter, a dynamic and static mixed PLA with singl...Programmable Logic Array (PLA) is an important building circuit of VLSI chips and some of the FPGA architectures have evolved from the basic PLA architectures. In this letter, a dynamic and static mixed PLA with single-phased clock is presented. Combining both dynamic and static design style rather than introducing additional interface-buffers overcomes the racing problem, thereby saves the chip area. Besides inheriting the advantages of dynamic circuit-low power dissipation and compact structure, this approach also provides high-speed operation.展开更多
Despite more than 40 years of development,it remains difficult for optical logic computing to support more than four operands because the high parallelism of light has not been fully exploited in current methods that ...Despite more than 40 years of development,it remains difficult for optical logic computing to support more than four operands because the high parallelism of light has not been fully exploited in current methods that are restrained by inefficient optical nonlinearity and redundant input modulation.In this paper,we propose a large-scale optical programmable logic array(PLA)based on parallel spectrum modulation.By fully exploiting the wavelength resource,an eight-input PLA is experimentally demonstrated with 256 wavelength channels.And it is extended to nine-input PLA through the combination of wavelength’s and spatial dimensions.Based on PLA,many advanced logic functions like 8-256 decoder,4-bit comparator,adder and multiplier,and state machines are first realized in optics.We implement the two-dimensional optical cellular automaton(CA)for what we believe is the first time and run Conway’s Game of Life to simulate the complex evolutionary processes(pulsar explosion,glider gun,and breeder).Other CA models,such as the replicator-like evolution and the nonisotropic evolution to generate the Sierpinski triangle are also demonstrated.Our work significantly alleviates the challenge of scalability in optical logic devices and provides a universal optical computing platform for two-dimensional CA.展开更多
Taking the advantage of ultrafast optical linear and nonlinear effects, all-optical signal processing(AOSP) enables manipulation, regeneration, and computing of information directly in optical domain without resorting...Taking the advantage of ultrafast optical linear and nonlinear effects, all-optical signal processing(AOSP) enables manipulation, regeneration, and computing of information directly in optical domain without resorting to electronics. As a promising photonic integration platform, silicon-on-insulator(SOI) has the advantage of complementary metal oxide semiconductor(CMOS) compatibility, low-loss, compact size as well as large optical nonlinearities. In this paper, we review the recent progress in the project granted to develop silicon-based reconfigurable AOSP chips, which aims to combine the merits of AOSP and silicon photonics to solve the unsustainable cost and energy challenges in future communication and big data applications. Three key challenges are identified in this project:(1) how to finely manipulate and reconfigure optical fields,(2) how to achieve ultra-low loss integrated silicon waveguides and significant enhancement of nonlinear effects,(3) how to mitigate crosstalk between optical, electrical and thermal components. By focusing on these key issues, the following major achievements are realized during the project. First, ultra-low loss silicon-based waveguides as well as ultra-high quality microresonators are developed by advancing key fabrication technologies as well as device structures. Integrated photonic filters with bandwidth and free spectral range reconfigurable in a wide range were realized to finely manipulate and select input light fields with a high degree of freedom. Second, several mechanisms and new designs that aim at nonlinear enhancement have been proposed, including optical ridge waveguides with reverse biased PIN junction, slot waveguides,multimode waveguides and parity-time symmetry coupled microresonators. Advanced AOSP operations are verified with these novel designs. Logical computations at 100 Gbit/s were demonstrated with self-developed, monolithic integrated programmable optical logic array. High-dimensional multi-value logic operations based on the four-wave mixing effect are realized. Multi-channel all-optical amplitude and phase regeneration technology is developed, and a multi-channel, multiformat, reconfigurable all-optical regeneration chip is realized. Expanding regeneration capacity via spatial dimension is also verified. Third, the crosstalk from optical as well as thermal coupling due to high-density integration are mitigated by developing novel optical designs and advanced packaging technologies, enabling high-density, small size, multi-channel and multi-functional operation with low power consumption. Finally, four programmable AOSP chips are developed, i.e.,programmable photonic filter chip, programmable photonic logic operation chip, multi-dimensional all-optical regeneration chip, and multi-channel and multi-functional AOSP chip with packaging. The major achievements developed in this project pave the way toward ultra-low loss, high-speed, high-efficient, high-density information processing in future classical and non-classical communication and computing applications.展开更多
基金Supported by the Commission of Science Technology and Industry for National Defense and the National Natural Science Foundation of China (No. 90307011)
文摘Programmable Logic Array (PLA) is an important building circuit of VLSI chips and some of the FPGA architectures have evolved from the basic PLA architectures. In this letter, a dynamic and static mixed PLA with single-phased clock is presented. Combining both dynamic and static design style rather than introducing additional interface-buffers overcomes the racing problem, thereby saves the chip area. Besides inheriting the advantages of dynamic circuit-low power dissipation and compact structure, this approach also provides high-speed operation.
基金supported in part by the National Key Research and Development Program of China(Grant No.2022YFB2804203)the National Natural Science Foundation of China(Grant Nos.62075075,62275088)the Knowledge Innovation Program of Wuhan-Basic Research(Grant No.2023010201010049).
文摘Despite more than 40 years of development,it remains difficult for optical logic computing to support more than four operands because the high parallelism of light has not been fully exploited in current methods that are restrained by inefficient optical nonlinearity and redundant input modulation.In this paper,we propose a large-scale optical programmable logic array(PLA)based on parallel spectrum modulation.By fully exploiting the wavelength resource,an eight-input PLA is experimentally demonstrated with 256 wavelength channels.And it is extended to nine-input PLA through the combination of wavelength’s and spatial dimensions.Based on PLA,many advanced logic functions like 8-256 decoder,4-bit comparator,adder and multiplier,and state machines are first realized in optics.We implement the two-dimensional optical cellular automaton(CA)for what we believe is the first time and run Conway’s Game of Life to simulate the complex evolutionary processes(pulsar explosion,glider gun,and breeder).Other CA models,such as the replicator-like evolution and the nonisotropic evolution to generate the Sierpinski triangle are also demonstrated.Our work significantly alleviates the challenge of scalability in optical logic devices and provides a universal optical computing platform for two-dimensional CA.
基金supported by the National Key Research and Development Program of China(No.2019YFB2203100).
文摘Taking the advantage of ultrafast optical linear and nonlinear effects, all-optical signal processing(AOSP) enables manipulation, regeneration, and computing of information directly in optical domain without resorting to electronics. As a promising photonic integration platform, silicon-on-insulator(SOI) has the advantage of complementary metal oxide semiconductor(CMOS) compatibility, low-loss, compact size as well as large optical nonlinearities. In this paper, we review the recent progress in the project granted to develop silicon-based reconfigurable AOSP chips, which aims to combine the merits of AOSP and silicon photonics to solve the unsustainable cost and energy challenges in future communication and big data applications. Three key challenges are identified in this project:(1) how to finely manipulate and reconfigure optical fields,(2) how to achieve ultra-low loss integrated silicon waveguides and significant enhancement of nonlinear effects,(3) how to mitigate crosstalk between optical, electrical and thermal components. By focusing on these key issues, the following major achievements are realized during the project. First, ultra-low loss silicon-based waveguides as well as ultra-high quality microresonators are developed by advancing key fabrication technologies as well as device structures. Integrated photonic filters with bandwidth and free spectral range reconfigurable in a wide range were realized to finely manipulate and select input light fields with a high degree of freedom. Second, several mechanisms and new designs that aim at nonlinear enhancement have been proposed, including optical ridge waveguides with reverse biased PIN junction, slot waveguides,multimode waveguides and parity-time symmetry coupled microresonators. Advanced AOSP operations are verified with these novel designs. Logical computations at 100 Gbit/s were demonstrated with self-developed, monolithic integrated programmable optical logic array. High-dimensional multi-value logic operations based on the four-wave mixing effect are realized. Multi-channel all-optical amplitude and phase regeneration technology is developed, and a multi-channel, multiformat, reconfigurable all-optical regeneration chip is realized. Expanding regeneration capacity via spatial dimension is also verified. Third, the crosstalk from optical as well as thermal coupling due to high-density integration are mitigated by developing novel optical designs and advanced packaging technologies, enabling high-density, small size, multi-channel and multi-functional operation with low power consumption. Finally, four programmable AOSP chips are developed, i.e.,programmable photonic filter chip, programmable photonic logic operation chip, multi-dimensional all-optical regeneration chip, and multi-channel and multi-functional AOSP chip with packaging. The major achievements developed in this project pave the way toward ultra-low loss, high-speed, high-efficient, high-density information processing in future classical and non-classical communication and computing applications.
