The Experts below are selected from a list of 33072 Experts worldwide ranked by ideXlab platform
Tetsuya Kawanishi - One of the best experts on this subject based on the ideXlab platform.
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laser Phase Fluctuation insensitive optical coherent transmission of 16 quadrature amplitude modulation radio over fiber signal
Journal of Lightwave Technology, 2016Co-Authors: Toshiaki Kuri, Takahide Sakamoto, Tetsuya KawanishiAbstract:A laser-Phase-Fluctuation-insensitive optical coherent transmission of a 10-Gbaud 16-quadrture-amplitude-modulation radio-over-fiber signal with an offset-frequency-spaced two-tone local light and an digital-signal-processing technique is experimentally demonstrated. Error-free symbol recovery after the 20-km-long fiber-optic transmission is shown and the transmission quality is evaluated.
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laser Phase Fluctuation insensitive offset frequency spaced two tone optical coherent detection scheme and its transmission for radio over fiber systems
Optics Express, 2015Co-Authors: Toshiaki Kuri, Takahide Sakamoto, Tetsuya KawanishiAbstract:We propose a new optical coherent detection scheme with a "two-tone" local light, which is also in principle insensitive to the laser Phase Fluctuation and is assisted by the digital signal processing technique for radio-over-fiber (RoF) systems. The main feature of our proposal is that the frequency separation of the two-tone local light is different from that of the RoF signal, which is called "offset-frequency-spaced" in this paper. First, we explain the principle of our new proposal and experimentally demonstrate the data recovery. Then, the influence of the frequency detuning between photo-detected modulated and unmodulated signals is discussed. Moreover, the transmission performance with an error vector magnitude (EVM) is evaluated for the optical coherent detection of a 10-Gbaud quadrature-Phase-shift-keying RoF signal after a 20-km-long standard single-mode fiber transmission.
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laser Phase Fluctuation insensitive optical coherent detection scheme for radio over fiber system
Journal of Lightwave Technology, 2014Co-Authors: Toshiaki Kuri, Takahide Sakamoto, Tetsuya KawanishiAbstract:Laser-Phase-Fluctuation-insensitive optical coherent detection scheme with two-tone local light and digital signal processing technique for a radio-over-fiber (RoF) signal is proposed and experimentally demonstrated. Data recovery with the error vector magnitude of less than 14% rms is successfully performed for 10- and 2.5-Gbaud 25-GHz-band QPSK RoF signals. In addition, bit error rate of less than 10 $^{-5}$ is also verified for 10-Gbaud 25-GHz-band QPSK RoF signal after 20-km fiber-optic transmission even if the light source with the linewidth of more than 10 MHz in the transmitter is used.
Toshiaki Kuri - One of the best experts on this subject based on the ideXlab platform.
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laser Phase Fluctuation insensitive optical coherent transmission of 16 quadrature amplitude modulation radio over fiber signal
Journal of Lightwave Technology, 2016Co-Authors: Toshiaki Kuri, Takahide Sakamoto, Tetsuya KawanishiAbstract:A laser-Phase-Fluctuation-insensitive optical coherent transmission of a 10-Gbaud 16-quadrture-amplitude-modulation radio-over-fiber signal with an offset-frequency-spaced two-tone local light and an digital-signal-processing technique is experimentally demonstrated. Error-free symbol recovery after the 20-km-long fiber-optic transmission is shown and the transmission quality is evaluated.
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Phase-Fluctuation-cancelled component combining technique in offset-frequency-spaced two-tone coherent detection system
2016 IEEE Photonics Conference (IPC), 2016Co-Authors: Toshiaki Kuri, Takahide SakamotoAbstract:One of polarization diversity techniques in offset-frequency-spaced two-tone optical coherent transmission of radio-over-fiber signal is investigated. As the polarization diversity, effective combination of two orthogonal Phase-Fluctuation-cancelled polarization components before symbol recovery is experimentally demonstrated.
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laser Phase Fluctuation insensitive offset frequency spaced two tone optical coherent detection scheme and its transmission for radio over fiber systems
Optics Express, 2015Co-Authors: Toshiaki Kuri, Takahide Sakamoto, Tetsuya KawanishiAbstract:We propose a new optical coherent detection scheme with a "two-tone" local light, which is also in principle insensitive to the laser Phase Fluctuation and is assisted by the digital signal processing technique for radio-over-fiber (RoF) systems. The main feature of our proposal is that the frequency separation of the two-tone local light is different from that of the RoF signal, which is called "offset-frequency-spaced" in this paper. First, we explain the principle of our new proposal and experimentally demonstrate the data recovery. Then, the influence of the frequency detuning between photo-detected modulated and unmodulated signals is discussed. Moreover, the transmission performance with an error vector magnitude (EVM) is evaluated for the optical coherent detection of a 10-Gbaud quadrature-Phase-shift-keying RoF signal after a 20-km-long standard single-mode fiber transmission.
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laser Phase Fluctuation insensitive optical coherent detection scheme for radio over fiber system
Journal of Lightwave Technology, 2014Co-Authors: Toshiaki Kuri, Takahide Sakamoto, Tetsuya KawanishiAbstract:Laser-Phase-Fluctuation-insensitive optical coherent detection scheme with two-tone local light and digital signal processing technique for a radio-over-fiber (RoF) signal is proposed and experimentally demonstrated. Data recovery with the error vector magnitude of less than 14% rms is successfully performed for 10- and 2.5-Gbaud 25-GHz-band QPSK RoF signals. In addition, bit error rate of less than 10 $^{-5}$ is also verified for 10-Gbaud 25-GHz-band QPSK RoF signal after 20-km fiber-optic transmission even if the light source with the linewidth of more than 10 MHz in the transmitter is used.
Qing Huo Liu - One of the best experts on this subject based on the ideXlab platform.
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constructing dual frequency oam circular patch antenna using characteristic mode theory
Journal of Applied Physics, 2019Co-Authors: Liangcai Zhang, Jianbin Zhu, Ze Tao, Qing Huo LiuAbstract:The current wavemodes and their distribution features of the circular patch are analyzed by using the characteristic mode theory. Then, the corresponding characteristic modes are selected and the feed structure is designed to generate the vortex waves carrying orbital angular momentum (OAM), based on the idea that the OAM mode can be realized by combining two orthogonal degenerate modes. The experimental results show that the proposed antenna can effectively implement dual-frequency dual-mode OAM waves. The first-order OAM mode of the electric field component in beam axis z direction is realized at low frequencies, while the second-order OAM mode of the z-component field is obtained at high frequencies. The Phase Fluctuation of the OAM modes can be explained by the excitation coefficient of the characteristic mode with quantitative properties.The current wavemodes and their distribution features of the circular patch are analyzed by using the characteristic mode theory. Then, the corresponding characteristic modes are selected and the feed structure is designed to generate the vortex waves carrying orbital angular momentum (OAM), based on the idea that the OAM mode can be realized by combining two orthogonal degenerate modes. The experimental results show that the proposed antenna can effectively implement dual-frequency dual-mode OAM waves. The first-order OAM mode of the electric field component in beam axis z direction is realized at low frequencies, while the second-order OAM mode of the z-component field is obtained at high frequencies. The Phase Fluctuation of the OAM modes can be explained by the excitation coefficient of the characteristic mode with quantitative properties.
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constructing dual frequency oam circular patch antenna using characteristic mode theory
Journal of Applied Physics, 2019Co-Authors: Liangcai Zhang, Jianbin Zhu, Ze Tao, Qing Huo LiuAbstract:The current wavemodes and their distribution features of the circular patch are analyzed by using the characteristic mode theory. Then, the corresponding characteristic modes are selected and the feed structure is designed to generate the vortex waves carrying orbital angular momentum (OAM), based on the idea that the OAM mode can be realized by combining two orthogonal degenerate modes. The experimental results show that the proposed antenna can effectively implement dual-frequency dual-mode OAM waves. The first-order OAM mode of the electric field component in beam axis z direction is realized at low frequencies, while the second-order OAM mode of the z-component field is obtained at high frequencies. The Phase Fluctuation of the OAM modes can be explained by the excitation coefficient of the characteristic mode with quantitative properties.
Takahide Sakamoto - One of the best experts on this subject based on the ideXlab platform.
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laser Phase Fluctuation insensitive optical coherent transmission of 16 quadrature amplitude modulation radio over fiber signal
Journal of Lightwave Technology, 2016Co-Authors: Toshiaki Kuri, Takahide Sakamoto, Tetsuya KawanishiAbstract:A laser-Phase-Fluctuation-insensitive optical coherent transmission of a 10-Gbaud 16-quadrture-amplitude-modulation radio-over-fiber signal with an offset-frequency-spaced two-tone local light and an digital-signal-processing technique is experimentally demonstrated. Error-free symbol recovery after the 20-km-long fiber-optic transmission is shown and the transmission quality is evaluated.
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Phase-Fluctuation-cancelled component combining technique in offset-frequency-spaced two-tone coherent detection system
2016 IEEE Photonics Conference (IPC), 2016Co-Authors: Toshiaki Kuri, Takahide SakamotoAbstract:One of polarization diversity techniques in offset-frequency-spaced two-tone optical coherent transmission of radio-over-fiber signal is investigated. As the polarization diversity, effective combination of two orthogonal Phase-Fluctuation-cancelled polarization components before symbol recovery is experimentally demonstrated.
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laser Phase Fluctuation insensitive offset frequency spaced two tone optical coherent detection scheme and its transmission for radio over fiber systems
Optics Express, 2015Co-Authors: Toshiaki Kuri, Takahide Sakamoto, Tetsuya KawanishiAbstract:We propose a new optical coherent detection scheme with a "two-tone" local light, which is also in principle insensitive to the laser Phase Fluctuation and is assisted by the digital signal processing technique for radio-over-fiber (RoF) systems. The main feature of our proposal is that the frequency separation of the two-tone local light is different from that of the RoF signal, which is called "offset-frequency-spaced" in this paper. First, we explain the principle of our new proposal and experimentally demonstrate the data recovery. Then, the influence of the frequency detuning between photo-detected modulated and unmodulated signals is discussed. Moreover, the transmission performance with an error vector magnitude (EVM) is evaluated for the optical coherent detection of a 10-Gbaud quadrature-Phase-shift-keying RoF signal after a 20-km-long standard single-mode fiber transmission.
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laser Phase Fluctuation insensitive optical coherent detection scheme for radio over fiber system
Journal of Lightwave Technology, 2014Co-Authors: Toshiaki Kuri, Takahide Sakamoto, Tetsuya KawanishiAbstract:Laser-Phase-Fluctuation-insensitive optical coherent detection scheme with two-tone local light and digital signal processing technique for a radio-over-fiber (RoF) signal is proposed and experimentally demonstrated. Data recovery with the error vector magnitude of less than 14% rms is successfully performed for 10- and 2.5-Gbaud 25-GHz-band QPSK RoF signals. In addition, bit error rate of less than 10 $^{-5}$ is also verified for 10-Gbaud 25-GHz-band QPSK RoF signal after 20-km fiber-optic transmission even if the light source with the linewidth of more than 10 MHz in the transmitter is used.
Liangcai Zhang - One of the best experts on this subject based on the ideXlab platform.
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constructing dual frequency oam circular patch antenna using characteristic mode theory
Journal of Applied Physics, 2019Co-Authors: Liangcai Zhang, Jianbin Zhu, Ze Tao, Qing Huo LiuAbstract:The current wavemodes and their distribution features of the circular patch are analyzed by using the characteristic mode theory. Then, the corresponding characteristic modes are selected and the feed structure is designed to generate the vortex waves carrying orbital angular momentum (OAM), based on the idea that the OAM mode can be realized by combining two orthogonal degenerate modes. The experimental results show that the proposed antenna can effectively implement dual-frequency dual-mode OAM waves. The first-order OAM mode of the electric field component in beam axis z direction is realized at low frequencies, while the second-order OAM mode of the z-component field is obtained at high frequencies. The Phase Fluctuation of the OAM modes can be explained by the excitation coefficient of the characteristic mode with quantitative properties.The current wavemodes and their distribution features of the circular patch are analyzed by using the characteristic mode theory. Then, the corresponding characteristic modes are selected and the feed structure is designed to generate the vortex waves carrying orbital angular momentum (OAM), based on the idea that the OAM mode can be realized by combining two orthogonal degenerate modes. The experimental results show that the proposed antenna can effectively implement dual-frequency dual-mode OAM waves. The first-order OAM mode of the electric field component in beam axis z direction is realized at low frequencies, while the second-order OAM mode of the z-component field is obtained at high frequencies. The Phase Fluctuation of the OAM modes can be explained by the excitation coefficient of the characteristic mode with quantitative properties.
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constructing dual frequency oam circular patch antenna using characteristic mode theory
Journal of Applied Physics, 2019Co-Authors: Liangcai Zhang, Jianbin Zhu, Ze Tao, Qing Huo LiuAbstract:The current wavemodes and their distribution features of the circular patch are analyzed by using the characteristic mode theory. Then, the corresponding characteristic modes are selected and the feed structure is designed to generate the vortex waves carrying orbital angular momentum (OAM), based on the idea that the OAM mode can be realized by combining two orthogonal degenerate modes. The experimental results show that the proposed antenna can effectively implement dual-frequency dual-mode OAM waves. The first-order OAM mode of the electric field component in beam axis z direction is realized at low frequencies, while the second-order OAM mode of the z-component field is obtained at high frequencies. The Phase Fluctuation of the OAM modes can be explained by the excitation coefficient of the characteristic mode with quantitative properties.