The Experts below are selected from a list of 5265 Experts worldwide ranked by ideXlab platform

M Abouzeid - One of the best experts on this subject based on the ideXlab platform.

  • use of a reluctance stepper motor for solar tracking based on a programmable logic array pla controller
    Renewable Energy, 2001
    Co-Authors: M Abouzeid
    Abstract:

    The tracking of solar cell panels in solar-generation systems has improved their overall efficiency to a great extent. The methods used previously were either active or passive. In order to ensure a relatively small position resolution for the panel axis, the DC motors ordinarily used for active solar tracking need a complicated gear system. In this work, a 8/6 four-phase, reluctance stepper motor (RSM) controlled by a programmable logic array (PLA) is used. The angular position resolution for the RSM is 7.5°. This resolution is guaranteed due to locking of the RSM at each step through a power converter fed from a 220 V DC supply. The control circuit for the power converter consists of an Erasable Electronic programmable Read Only Memory (EEPROM) and a PLA chip. The control circuit is fed from two separate sensing cells which determine the movement to the next angular position. The application of this tracker is essential for stand-alone systems in remote areas. Its use may result in improving the solar energy generation by a considerable factor. The control system is a completely closed loop system without any human interference.

  • use of a reluctance stepper motor for solar tracking based on a programmable logic array pla controller
    Renewable Energy, 2001
    Co-Authors: M Abouzeid
    Abstract:

    The tracking of solar cell panels in solar-generation systems has improved their overall efficiency to a great extent. The methods used previously were either active or passive. In order to ensure a relatively small position resolution for the panel axis, the DC motors ordinarily used for active solar tracking need a complicated gear system. In this work, a 8/6 four-phase, reluctance stepper motor (RSM) controlled by a programmable logic array (PLA) is used. The angular position resolution for the RSM is 7.5°. This resolution is guaranteed due to locking of the RSM at each step through a power converter fed from a 220 V DC supply. The control circuit for the power converter consists of an Erasable Electronic programmable Read Only Memory (EEPROM) and a PLA chip. The control circuit is fed from two separate sensing cells which determine the movement to the next angular position. The application of this tracker is essential for stand-alone systems in remote areas. Its use may result in improving the solar energy generation by a considerable factor. The control system is a completely closed loop system without any human interference.

Xinliang Zhang - One of the best experts on this subject based on the ideXlab platform.

  • investigation on expanding the computing capacity of optical programmable logic array based on canonical logic units
    Journal of Lightwave Technology, 2018
    Co-Authors: Wenchan Dong, Jie Hou, Xinliang Zhang
    Abstract:

    A general structure of an all-optical canonical logic based programmable logic array (CLUs-PLA) based on three methods to expand its computing capacity is presented. These methods include introducing bidirectional structure for nonlinear devices, utilizing wavelength multicast of four-wave mixing (FWM), and exploiting different nonlinear effects simultaneously, which fully utilize the parallelism of optical signals. Aiming at this general structure, we quantitatively analyze its computing capacity in detail, which is obviously enlarged comparing with the standard CLUs-PLA. To demonstrate our proposal, an experiment of CLUs’ simultaneous generation in nine parallel wavelength channels using bidirectional FWM is carried out. Comparing with the standard CLUs-PLA, the computing capacity of the expanded one is enlarged to 7.5 times.

  • integrated all optical programmable logic array based on semiconductor optical amplifiers
    Optics Letters, 2018
    Co-Authors: Wenchan Dong, Zhuyang Huang, Jie Hou, Rui Santos, Xinliang Zhang
    Abstract:

    The all-optical programmable logic array (PLA) is one of the most important optical complex logic devices that can implement combinational logic functions. In this Letter, we propose and experimentally demonstrate an integrated all-optical PLA at the operation speed of 40 Gb/s. The PLA mainly consists of a delay interferometer (DI) and semiconductor optical amplifiers (SOAs) of different lengths. The DI is used to pre-code the input signals and improve the reconfigurability of the scheme. The longer SOAs are nonlinear media for generating canonical logic units (CLUs) using four-wave mixing. The shorter SOAs are used to select the appropriate CLUs by changing the working states; then reconfigurable logic functions can be output directly. The results show that all the CLUs are realized successfully, and the optical signal-to-noise ratios are above 22 dB. The exclusive NOR gate and exclusive OR gate are experimentally demonstrated based on output CLUs.

  • expanded all optical programmable logic array based on multi input output canonical logic units
    Optics Express, 2014
    Co-Authors: Lei Lei, Wenchan Dong, Jianji Dong, Bingrong Zou, Xinliang Zhang
    Abstract:

    We present an expanded all-optical programmable logic array (O-PLA) using multi-input and multi-output canonical logic units (CLUs) generation. Based on four-wave mixing (FWM) in highly nonlinear fiber (HNLF), two-input and three-input CLUs are simultaneously achieved in five different channels with an operation speed of 40 Gb/s. Clear temporal waveforms and wide open eye diagrams are successfully observed. The effectiveness of the scheme is validated by extinction ratio and optical signal-to-noise ratio measurements. The computing capacity, defined as the total amount of logic functions achieved by the O-PLA, is discussed in detail. For a three-input O-PLA, the computing capacity of the expanded CLUs-PLA is more than two times as large as that of the standard CLUs-PLA, and this multiple will increase to more than three and a half as the idlers are individually independent.

  • All-optical programmable logic arrays using SOA-based canonical logic units
    Information Optics and Optical Data Storage II, 2012
    Co-Authors: Lei Lei, Jianji Dong, Xinliang Zhang
    Abstract:

    All-optical programmable logic arrays (PLAs) based on canonical logic units (CLUs), i.e. minterms and maxterms, are presented. We experimentally demonstrated the full set of two-input and three-input minterms as well as maxterms using the cross-gain modulation in semiconductor optical amplifiers (SOAs). Maxterms can be easily obtained based on minterms. The reconfigurability and scalability of the system are largely enhanced compared to our previous work. Correct and clear temporal waveforms are achieved for all the canonical logic units. The measured extinction ratios of two-input and three-input CLUs are ~ 15 dB and ~ 11 dB, respectively. Four important logic functions, including multiplier, multiplexer, demultiplexer and decoder, are presented as examples to show that the canonical logic units-based programmable logic array (CLUs-PLA) can be reconfigured to perform different logic functions.

  • all optical canonical logic units based programmable logic array clus pla using semiconductor optical amplifiers
    Journal of Lightwave Technology, 2012
    Co-Authors: Lei Lei, Jianji Dong, Sisi Tan, Xinliang Zhang
    Abstract:

    All-optical programmable logic arrays (PLAs) based on canonical logic units (CLUs), i.e., minterms and maxterms, are presented. We experimentally demonstrated the full set of two-input and three-input minterms as well as maxterms using the cross-gain modulation in semiconductor optical amplifiers (SOAs). Maxterms can be easily obtained based on minterms. The reconfigurability and scalability of the system are largely enhanced compared to our previous work. Correct and clear temporal waveforms are achieved for all the canonical logic units. The measured extinction ratios of two-input and three-input CLUs are ~ 15 dB and ~ 11 dB, respectively. Based on the CLUs, both sum-of-products and product-of-sums typed PLAs are exhibited. Six important logic functions, including full-adder, full-subtractor, multiplier, multiplexer, demultiplexer and decoder, are presented as examples to show that the canonical logic units-based programmable logic array (CLUs-PLA) can be reconfigured to perform different logic functions. The features of simple architectures, integration ability of SOA and programmable filter enable the great integration potential for CLUs-PLA.

Wenchan Dong - One of the best experts on this subject based on the ideXlab platform.

  • investigation on expanding the computing capacity of optical programmable logic array based on canonical logic units
    Journal of Lightwave Technology, 2018
    Co-Authors: Wenchan Dong, Jie Hou, Xinliang Zhang
    Abstract:

    A general structure of an all-optical canonical logic based programmable logic array (CLUs-PLA) based on three methods to expand its computing capacity is presented. These methods include introducing bidirectional structure for nonlinear devices, utilizing wavelength multicast of four-wave mixing (FWM), and exploiting different nonlinear effects simultaneously, which fully utilize the parallelism of optical signals. Aiming at this general structure, we quantitatively analyze its computing capacity in detail, which is obviously enlarged comparing with the standard CLUs-PLA. To demonstrate our proposal, an experiment of CLUs’ simultaneous generation in nine parallel wavelength channels using bidirectional FWM is carried out. Comparing with the standard CLUs-PLA, the computing capacity of the expanded one is enlarged to 7.5 times.

  • integrated all optical programmable logic array based on semiconductor optical amplifiers
    Optics Letters, 2018
    Co-Authors: Wenchan Dong, Zhuyang Huang, Jie Hou, Rui Santos, Xinliang Zhang
    Abstract:

    The all-optical programmable logic array (PLA) is one of the most important optical complex logic devices that can implement combinational logic functions. In this Letter, we propose and experimentally demonstrate an integrated all-optical PLA at the operation speed of 40 Gb/s. The PLA mainly consists of a delay interferometer (DI) and semiconductor optical amplifiers (SOAs) of different lengths. The DI is used to pre-code the input signals and improve the reconfigurability of the scheme. The longer SOAs are nonlinear media for generating canonical logic units (CLUs) using four-wave mixing. The shorter SOAs are used to select the appropriate CLUs by changing the working states; then reconfigurable logic functions can be output directly. The results show that all the CLUs are realized successfully, and the optical signal-to-noise ratios are above 22 dB. The exclusive NOR gate and exclusive OR gate are experimentally demonstrated based on output CLUs.

  • expanded all optical programmable logic array based on multi input output canonical logic units
    Optics Express, 2014
    Co-Authors: Lei Lei, Wenchan Dong, Jianji Dong, Bingrong Zou, Xinliang Zhang
    Abstract:

    We present an expanded all-optical programmable logic array (O-PLA) using multi-input and multi-output canonical logic units (CLUs) generation. Based on four-wave mixing (FWM) in highly nonlinear fiber (HNLF), two-input and three-input CLUs are simultaneously achieved in five different channels with an operation speed of 40 Gb/s. Clear temporal waveforms and wide open eye diagrams are successfully observed. The effectiveness of the scheme is validated by extinction ratio and optical signal-to-noise ratio measurements. The computing capacity, defined as the total amount of logic functions achieved by the O-PLA, is discussed in detail. For a three-input O-PLA, the computing capacity of the expanded CLUs-PLA is more than two times as large as that of the standard CLUs-PLA, and this multiple will increase to more than three and a half as the idlers are individually independent.

Lei Lei - One of the best experts on this subject based on the ideXlab platform.

  • expanded all optical programmable logic array based on multi input output canonical logic units
    Optics Express, 2014
    Co-Authors: Lei Lei, Wenchan Dong, Jianji Dong, Bingrong Zou, Xinliang Zhang
    Abstract:

    We present an expanded all-optical programmable logic array (O-PLA) using multi-input and multi-output canonical logic units (CLUs) generation. Based on four-wave mixing (FWM) in highly nonlinear fiber (HNLF), two-input and three-input CLUs are simultaneously achieved in five different channels with an operation speed of 40 Gb/s. Clear temporal waveforms and wide open eye diagrams are successfully observed. The effectiveness of the scheme is validated by extinction ratio and optical signal-to-noise ratio measurements. The computing capacity, defined as the total amount of logic functions achieved by the O-PLA, is discussed in detail. For a three-input O-PLA, the computing capacity of the expanded CLUs-PLA is more than two times as large as that of the standard CLUs-PLA, and this multiple will increase to more than three and a half as the idlers are individually independent.

  • All-optical programmable logic arrays using SOA-based canonical logic units
    Information Optics and Optical Data Storage II, 2012
    Co-Authors: Lei Lei, Jianji Dong, Xinliang Zhang
    Abstract:

    All-optical programmable logic arrays (PLAs) based on canonical logic units (CLUs), i.e. minterms and maxterms, are presented. We experimentally demonstrated the full set of two-input and three-input minterms as well as maxterms using the cross-gain modulation in semiconductor optical amplifiers (SOAs). Maxterms can be easily obtained based on minterms. The reconfigurability and scalability of the system are largely enhanced compared to our previous work. Correct and clear temporal waveforms are achieved for all the canonical logic units. The measured extinction ratios of two-input and three-input CLUs are ~ 15 dB and ~ 11 dB, respectively. Four important logic functions, including multiplier, multiplexer, demultiplexer and decoder, are presented as examples to show that the canonical logic units-based programmable logic array (CLUs-PLA) can be reconfigured to perform different logic functions.

  • all optical canonical logic units based programmable logic array clus pla using semiconductor optical amplifiers
    Journal of Lightwave Technology, 2012
    Co-Authors: Lei Lei, Jianji Dong, Sisi Tan, Xinliang Zhang
    Abstract:

    All-optical programmable logic arrays (PLAs) based on canonical logic units (CLUs), i.e., minterms and maxterms, are presented. We experimentally demonstrated the full set of two-input and three-input minterms as well as maxterms using the cross-gain modulation in semiconductor optical amplifiers (SOAs). Maxterms can be easily obtained based on minterms. The reconfigurability and scalability of the system are largely enhanced compared to our previous work. Correct and clear temporal waveforms are achieved for all the canonical logic units. The measured extinction ratios of two-input and three-input CLUs are ~ 15 dB and ~ 11 dB, respectively. Based on the CLUs, both sum-of-products and product-of-sums typed PLAs are exhibited. Six important logic functions, including full-adder, full-subtractor, multiplier, multiplexer, demultiplexer and decoder, are presented as examples to show that the canonical logic units-based programmable logic array (CLUs-PLA) can be reconfigured to perform different logic functions. The features of simple architectures, integration ability of SOA and programmable filter enable the great integration potential for CLUs-PLA.

Jie Hou - One of the best experts on this subject based on the ideXlab platform.

  • investigation on expanding the computing capacity of optical programmable logic array based on canonical logic units
    Journal of Lightwave Technology, 2018
    Co-Authors: Wenchan Dong, Jie Hou, Xinliang Zhang
    Abstract:

    A general structure of an all-optical canonical logic based programmable logic array (CLUs-PLA) based on three methods to expand its computing capacity is presented. These methods include introducing bidirectional structure for nonlinear devices, utilizing wavelength multicast of four-wave mixing (FWM), and exploiting different nonlinear effects simultaneously, which fully utilize the parallelism of optical signals. Aiming at this general structure, we quantitatively analyze its computing capacity in detail, which is obviously enlarged comparing with the standard CLUs-PLA. To demonstrate our proposal, an experiment of CLUs’ simultaneous generation in nine parallel wavelength channels using bidirectional FWM is carried out. Comparing with the standard CLUs-PLA, the computing capacity of the expanded one is enlarged to 7.5 times.

  • integrated all optical programmable logic array based on semiconductor optical amplifiers
    Optics Letters, 2018
    Co-Authors: Wenchan Dong, Zhuyang Huang, Jie Hou, Rui Santos, Xinliang Zhang
    Abstract:

    The all-optical programmable logic array (PLA) is one of the most important optical complex logic devices that can implement combinational logic functions. In this Letter, we propose and experimentally demonstrate an integrated all-optical PLA at the operation speed of 40 Gb/s. The PLA mainly consists of a delay interferometer (DI) and semiconductor optical amplifiers (SOAs) of different lengths. The DI is used to pre-code the input signals and improve the reconfigurability of the scheme. The longer SOAs are nonlinear media for generating canonical logic units (CLUs) using four-wave mixing. The shorter SOAs are used to select the appropriate CLUs by changing the working states; then reconfigurable logic functions can be output directly. The results show that all the CLUs are realized successfully, and the optical signal-to-noise ratios are above 22 dB. The exclusive NOR gate and exclusive OR gate are experimentally demonstrated based on output CLUs.