The Experts below are selected from a list of 32766 Experts worldwide ranked by ideXlab platform
Naoya Wada - One of the best experts on this subject based on the ideXlab platform.
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rapid reconfigurable ocdma system using single phase modulator for time domain spectral phase encoding decoding and dpsk data modulation
Journal of Lightwave Technology, 2011Co-Authors: Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya WadaAbstract:An optical-Code-division-multiple-access (OCDMA) system with a novel modulation scheme for simultaneous generation of time-domain spectral phase encoding/decoding (SPE/SPD) and differential phase-shift keying (DPSK) data modulation that can be potentially rapidly reconfigured using only a single-phase modulator (PM) is proposed and experimentally demonstrated. The time-domain SPE is realized by stretching and compressing the ultrashort optical pulse through two-chirped fiber Bragg gratings with opposite dispersion and a high-speed PM for optical Code (OC) generation and data modulation. The SPD has similar configuration as the SPE counterpart but using another PM synchronously driven by the complementary Code pattern for OC recognition. Simulation investigation and experimental results both show that the Code Transition, dispersion mismatch between the encoding and decoding side, and the transmission fiber dispersion have detrimental effect on the en/decoding performance. In the experiment, 16-chip, 40-Gchip/s OC pattern and 2.5-Gb/s DPSK data modulation have been simultaneously generated using a single PM. The 2.5-Gb/s DPSK data have been successfully deCoded and transmitted over 34 km fiber with BER <; 10-9 for five OCs. The proposed scheme employs similar setup for transmitter and receiver, exhibiting the potential to simplify the architecture of the whole system, and improve the flexibility and confidentiality of OCDMA system.
Zhensen Gao - One of the best experts on this subject based on the ideXlab platform.
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rapid reconfigurable ocdma system using single phase modulator for time domain spectral phase encoding decoding and dpsk data modulation
Journal of Lightwave Technology, 2011Co-Authors: Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya WadaAbstract:An optical-Code-division-multiple-access (OCDMA) system with a novel modulation scheme for simultaneous generation of time-domain spectral phase encoding/decoding (SPE/SPD) and differential phase-shift keying (DPSK) data modulation that can be potentially rapidly reconfigured using only a single-phase modulator (PM) is proposed and experimentally demonstrated. The time-domain SPE is realized by stretching and compressing the ultrashort optical pulse through two-chirped fiber Bragg gratings with opposite dispersion and a high-speed PM for optical Code (OC) generation and data modulation. The SPD has similar configuration as the SPE counterpart but using another PM synchronously driven by the complementary Code pattern for OC recognition. Simulation investigation and experimental results both show that the Code Transition, dispersion mismatch between the encoding and decoding side, and the transmission fiber dispersion have detrimental effect on the en/decoding performance. In the experiment, 16-chip, 40-Gchip/s OC pattern and 2.5-Gb/s DPSK data modulation have been simultaneously generated using a single PM. The 2.5-Gb/s DPSK data have been successfully deCoded and transmitted over 34 km fiber with BER <; 10-9 for five OCs. The proposed scheme employs similar setup for transmitter and receiver, exhibiting the potential to simplify the architecture of the whole system, and improve the flexibility and confidentiality of OCDMA system.
Nobuyuki Kataoka - One of the best experts on this subject based on the ideXlab platform.
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rapid reconfigurable ocdma system using single phase modulator for time domain spectral phase encoding decoding and dpsk data modulation
Journal of Lightwave Technology, 2011Co-Authors: Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya WadaAbstract:An optical-Code-division-multiple-access (OCDMA) system with a novel modulation scheme for simultaneous generation of time-domain spectral phase encoding/decoding (SPE/SPD) and differential phase-shift keying (DPSK) data modulation that can be potentially rapidly reconfigured using only a single-phase modulator (PM) is proposed and experimentally demonstrated. The time-domain SPE is realized by stretching and compressing the ultrashort optical pulse through two-chirped fiber Bragg gratings with opposite dispersion and a high-speed PM for optical Code (OC) generation and data modulation. The SPD has similar configuration as the SPE counterpart but using another PM synchronously driven by the complementary Code pattern for OC recognition. Simulation investigation and experimental results both show that the Code Transition, dispersion mismatch between the encoding and decoding side, and the transmission fiber dispersion have detrimental effect on the en/decoding performance. In the experiment, 16-chip, 40-Gchip/s OC pattern and 2.5-Gb/s DPSK data modulation have been simultaneously generated using a single PM. The 2.5-Gb/s DPSK data have been successfully deCoded and transmitted over 34 km fiber with BER <; 10-9 for five OCs. The proposed scheme employs similar setup for transmitter and receiver, exhibiting the potential to simplify the architecture of the whole system, and improve the flexibility and confidentiality of OCDMA system.
Xu Wang - One of the best experts on this subject based on the ideXlab platform.
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rapid reconfigurable ocdma system using single phase modulator for time domain spectral phase encoding decoding and dpsk data modulation
Journal of Lightwave Technology, 2011Co-Authors: Zhensen Gao, Xu Wang, Nobuyuki Kataoka, Naoya WadaAbstract:An optical-Code-division-multiple-access (OCDMA) system with a novel modulation scheme for simultaneous generation of time-domain spectral phase encoding/decoding (SPE/SPD) and differential phase-shift keying (DPSK) data modulation that can be potentially rapidly reconfigured using only a single-phase modulator (PM) is proposed and experimentally demonstrated. The time-domain SPE is realized by stretching and compressing the ultrashort optical pulse through two-chirped fiber Bragg gratings with opposite dispersion and a high-speed PM for optical Code (OC) generation and data modulation. The SPD has similar configuration as the SPE counterpart but using another PM synchronously driven by the complementary Code pattern for OC recognition. Simulation investigation and experimental results both show that the Code Transition, dispersion mismatch between the encoding and decoding side, and the transmission fiber dispersion have detrimental effect on the en/decoding performance. In the experiment, 16-chip, 40-Gchip/s OC pattern and 2.5-Gb/s DPSK data modulation have been simultaneously generated using a single PM. The 2.5-Gb/s DPSK data have been successfully deCoded and transmitted over 34 km fiber with BER <; 10-9 for five OCs. The proposed scheme employs similar setup for transmitter and receiver, exhibiting the potential to simplify the architecture of the whole system, and improve the flexibility and confidentiality of OCDMA system.
D K Mishra - One of the best experts on this subject based on the ideXlab platform.
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precision measurement of adc parameters with cumulative histogram technique using gaussian noise
Microelectronics Journal, 2020Co-Authors: Bhawana Garg, D K MishraAbstract:Abstract Analog to Digital Converter (ADC) is a significant part of any electronic measurement and instrumentation system. It affects the overall accuracy of the system, therefore it should be characterized and tested precisely. The ADC testing methods, available in literature use deterministic signals as stimuli and have certain limitations. This paper presents statistical testing of ADC based on the cumulative histogram technique with white Gaussian noise as stimuli. The proposed method is not much more explored in literature and shows improvement in the estimation of parameters. A large number of samples of Gaussian noise is simulated and applied to the simulated 5–10 bit ADC. The cumulative histogram is estimated, and the Code Transition level is calculated to obtain the transfer characteristics of ADC. The linear regression method is employed on the transfer characteristics and the best-fit line is obtained. Corrections have been applied to nullify the gain and offset error. Comparative analysis of the transfer characteristics of simulated ideal and actual ADC will lead to develop the algorithm for the estimation of static parameters Gain, offset, Integral and Differential nonlinearities, and the Effective Number of Bits. The analytical expression for the precision measurement of these parameters is derived. Simulation results are presented in support of the derived expression of the proposed method. Obtained results are compared with the results presented in the literature and hence the effectiveness of the method.
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Code Transition error effects on estimation of nonlinearity and enob of an a d converter
International Journal of Electronics, 2011Co-Authors: R S Gamad, D K MishraAbstract:Effects of error in Code Transition levels on nonlinearity and effective number of bits (ENOB) of an analog to digital converter (ADC) are presented in this article. Error in Code Transition level is determined by deviation of Code Transition levels from the mean of the estimated Code Transition levels. Errors in estimate of differential nonlinearity (DNL), integral nonlinearity (INL) and ENOB are computed by considering error in Code Transition levels and computing corresponding values. In this study, 5- and 8-bit ADC transfer characteristics are simulated and arbitrary nonlinearity errors are introduced. Suitable corrections are applied in Code Transition levels and computation of estimate of nonlinearity with and without corrections are reported. Results have been compared with earlier published work and improvements are observed. Effects of overdrive and additive noise on ENOB for 5-bit ADC are also reported.