The Experts below are selected from a list of 16473 Experts worldwide ranked by ideXlab platform
Masataka Nakazawa - One of the best experts on this subject based on the ideXlab platform.
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Single-channel 3.84 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 10.6 bit/s/Hz.
Optics express, 2017Co-Authors: Junpei Nitta, Masato Yoshida, Toshihiko Hirooka, Kosuke Kimura, Keisuke Kasai, Masataka NakazawaAbstract:We report a polarization-multiplexed 320 Gbaud, 64 QAM coherent Nyquist pulse transmission with a frequency-stabilized mode-locked laser and a modified digital Back-Propagation Method for pulse transmission. Using a combination consisting of a mode-locked laser and a pulse shaper, we obtained a Nyquist pulse with a high OSNR of 51 dB. We achieved error free operation under a Back-to-Back condition with the OSNR improvement. By developing a new digital Back-Propagation Method for pulse Propagation, we achieved a bit error rate below the 7% forward error correction limit of 2x10-3 for all the tributaries of the OTDM signal data after a 150 km transmission. As a result, single-channel 3.84 Tbit/s data were successfully transmitted over 150 km with a spectral efficiency of 10.6 bit/s/Hz.
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Marked performance improvement of 256 QAM transmission using a digital Back-Propagation Method
Optics express, 2012Co-Authors: Kazushi Toyoda, Yuki Koizumi, Tatsunori Omiya, Masato Yoshida, Toshihiko Hirooka, Masataka NakazawaAbstract:We demonstrate substantial performance improvements in 256 QAM transmission in terms of both data rate and distance that we realized by using a digital Back-Propagation (DBP) Method. 160 Gbit/s-160 km and 64 Gbit/s-560 km transmissions were successfully achieved with a polarization-multiplexed 256 QAM signal, in which the symbol rate and transmission distance were greatly increased by compensating for the interplay between dispersion and nonlinearity, which is responsible for the transmission impairment especially for a higher symbol rate and longer distance.
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1024 qam 60 gbit s single carrier coherent optical transmission over 150 km
Optics Express, 2012Co-Authors: Yuki Koizumi, Kazushi Toyoda, Masato Yoshida, Masataka NakazawaAbstract:We demonstrate a record QAM multiplicity of 1024 levels in a single-carrier coherent transmission. A frequency-domain equalization technique and a Back-Propagation Method are adopted to compensate for distortions caused by hardware imperfections and fiber impairments, respectively. As a result, 60 Gbit/s polarization-multiplexed transmission over 150-km has been achieved at 3 Gsymbol/s within an optical bandwidth of only 4.05 GHz.
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1024 QAM (60 Gbit/s) single-carrier coherent optical transmission over 150 km.
Optics express, 2012Co-Authors: Yuki Koizumi, Kazushi Toyoda, Masato Yoshida, Masataka NakazawaAbstract:We demonstrate a record QAM multiplicity of 1024 levels in a single-carrier coherent transmission. A frequency-domain equalization technique and a Back-Propagation Method are adopted to compensate for distortions caused by hardware imperfections and fiber impairments, respectively. As a result, 60 Gbit/s polarization-multiplexed transmission over 150-km has been achieved at 3 Gsymbol/s within an optical bandwidth of only 4.05 GHz.
Leon Bottou - One of the best experts on this subject based on the ideXlab platform.
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stochastic gradient descent tricks
Neural Networks: Tricks of the Trade (2nd ed.), 2012Co-Authors: Leon BottouAbstract:Chapter 1 strongly advocates the stochastic Back-Propagation Method to train neural networks. This is in fact an instance of a more general technique called stochastic gradient descent (SGD). This chapter provides Background material, explains why SGD is a good learning algorithm when the training set is large, and provides useful recommendations.
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Neural Networks: Tricks of the Trade (2nd ed.) - Stochastic Gradient Descent Tricks
Lecture Notes in Computer Science, 2012Co-Authors: Leon BottouAbstract:Chapter 1 strongly advocates the stochastic Back-Propagation Method to train neural networks. This is in fact an instance of a more general technique called stochastic gradient descent (SGD). This chapter provides Background material, explains why SGD is a good learning algorithm when the training set is large, and provides useful recommendations.
Yuki Koizumi - One of the best experts on this subject based on the ideXlab platform.
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Marked performance improvement of 256 QAM transmission using a digital Back-Propagation Method
Optics express, 2012Co-Authors: Kazushi Toyoda, Yuki Koizumi, Tatsunori Omiya, Masato Yoshida, Toshihiko Hirooka, Masataka NakazawaAbstract:We demonstrate substantial performance improvements in 256 QAM transmission in terms of both data rate and distance that we realized by using a digital Back-Propagation (DBP) Method. 160 Gbit/s-160 km and 64 Gbit/s-560 km transmissions were successfully achieved with a polarization-multiplexed 256 QAM signal, in which the symbol rate and transmission distance were greatly increased by compensating for the interplay between dispersion and nonlinearity, which is responsible for the transmission impairment especially for a higher symbol rate and longer distance.
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1024 qam 60 gbit s single carrier coherent optical transmission over 150 km
Optics Express, 2012Co-Authors: Yuki Koizumi, Kazushi Toyoda, Masato Yoshida, Masataka NakazawaAbstract:We demonstrate a record QAM multiplicity of 1024 levels in a single-carrier coherent transmission. A frequency-domain equalization technique and a Back-Propagation Method are adopted to compensate for distortions caused by hardware imperfections and fiber impairments, respectively. As a result, 60 Gbit/s polarization-multiplexed transmission over 150-km has been achieved at 3 Gsymbol/s within an optical bandwidth of only 4.05 GHz.
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1024 QAM (60 Gbit/s) single-carrier coherent optical transmission over 150 km.
Optics express, 2012Co-Authors: Yuki Koizumi, Kazushi Toyoda, Masato Yoshida, Masataka NakazawaAbstract:We demonstrate a record QAM multiplicity of 1024 levels in a single-carrier coherent transmission. A frequency-domain equalization technique and a Back-Propagation Method are adopted to compensate for distortions caused by hardware imperfections and fiber impairments, respectively. As a result, 60 Gbit/s polarization-multiplexed transmission over 150-km has been achieved at 3 Gsymbol/s within an optical bandwidth of only 4.05 GHz.
Masato Yoshida - One of the best experts on this subject based on the ideXlab platform.
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Single-channel 3.84 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 10.6 bit/s/Hz.
Optics express, 2017Co-Authors: Junpei Nitta, Masato Yoshida, Toshihiko Hirooka, Kosuke Kimura, Keisuke Kasai, Masataka NakazawaAbstract:We report a polarization-multiplexed 320 Gbaud, 64 QAM coherent Nyquist pulse transmission with a frequency-stabilized mode-locked laser and a modified digital Back-Propagation Method for pulse transmission. Using a combination consisting of a mode-locked laser and a pulse shaper, we obtained a Nyquist pulse with a high OSNR of 51 dB. We achieved error free operation under a Back-to-Back condition with the OSNR improvement. By developing a new digital Back-Propagation Method for pulse Propagation, we achieved a bit error rate below the 7% forward error correction limit of 2x10-3 for all the tributaries of the OTDM signal data after a 150 km transmission. As a result, single-channel 3.84 Tbit/s data were successfully transmitted over 150 km with a spectral efficiency of 10.6 bit/s/Hz.
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Marked performance improvement of 256 QAM transmission using a digital Back-Propagation Method
Optics express, 2012Co-Authors: Kazushi Toyoda, Yuki Koizumi, Tatsunori Omiya, Masato Yoshida, Toshihiko Hirooka, Masataka NakazawaAbstract:We demonstrate substantial performance improvements in 256 QAM transmission in terms of both data rate and distance that we realized by using a digital Back-Propagation (DBP) Method. 160 Gbit/s-160 km and 64 Gbit/s-560 km transmissions were successfully achieved with a polarization-multiplexed 256 QAM signal, in which the symbol rate and transmission distance were greatly increased by compensating for the interplay between dispersion and nonlinearity, which is responsible for the transmission impairment especially for a higher symbol rate and longer distance.
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1024 qam 60 gbit s single carrier coherent optical transmission over 150 km
Optics Express, 2012Co-Authors: Yuki Koizumi, Kazushi Toyoda, Masato Yoshida, Masataka NakazawaAbstract:We demonstrate a record QAM multiplicity of 1024 levels in a single-carrier coherent transmission. A frequency-domain equalization technique and a Back-Propagation Method are adopted to compensate for distortions caused by hardware imperfections and fiber impairments, respectively. As a result, 60 Gbit/s polarization-multiplexed transmission over 150-km has been achieved at 3 Gsymbol/s within an optical bandwidth of only 4.05 GHz.
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1024 QAM (60 Gbit/s) single-carrier coherent optical transmission over 150 km.
Optics express, 2012Co-Authors: Yuki Koizumi, Kazushi Toyoda, Masato Yoshida, Masataka NakazawaAbstract:We demonstrate a record QAM multiplicity of 1024 levels in a single-carrier coherent transmission. A frequency-domain equalization technique and a Back-Propagation Method are adopted to compensate for distortions caused by hardware imperfections and fiber impairments, respectively. As a result, 60 Gbit/s polarization-multiplexed transmission over 150-km has been achieved at 3 Gsymbol/s within an optical bandwidth of only 4.05 GHz.
Kazushi Toyoda - One of the best experts on this subject based on the ideXlab platform.
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Marked performance improvement of 256 QAM transmission using a digital Back-Propagation Method
Optics express, 2012Co-Authors: Kazushi Toyoda, Yuki Koizumi, Tatsunori Omiya, Masato Yoshida, Toshihiko Hirooka, Masataka NakazawaAbstract:We demonstrate substantial performance improvements in 256 QAM transmission in terms of both data rate and distance that we realized by using a digital Back-Propagation (DBP) Method. 160 Gbit/s-160 km and 64 Gbit/s-560 km transmissions were successfully achieved with a polarization-multiplexed 256 QAM signal, in which the symbol rate and transmission distance were greatly increased by compensating for the interplay between dispersion and nonlinearity, which is responsible for the transmission impairment especially for a higher symbol rate and longer distance.
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1024 qam 60 gbit s single carrier coherent optical transmission over 150 km
Optics Express, 2012Co-Authors: Yuki Koizumi, Kazushi Toyoda, Masato Yoshida, Masataka NakazawaAbstract:We demonstrate a record QAM multiplicity of 1024 levels in a single-carrier coherent transmission. A frequency-domain equalization technique and a Back-Propagation Method are adopted to compensate for distortions caused by hardware imperfections and fiber impairments, respectively. As a result, 60 Gbit/s polarization-multiplexed transmission over 150-km has been achieved at 3 Gsymbol/s within an optical bandwidth of only 4.05 GHz.
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1024 QAM (60 Gbit/s) single-carrier coherent optical transmission over 150 km.
Optics express, 2012Co-Authors: Yuki Koizumi, Kazushi Toyoda, Masato Yoshida, Masataka NakazawaAbstract:We demonstrate a record QAM multiplicity of 1024 levels in a single-carrier coherent transmission. A frequency-domain equalization technique and a Back-Propagation Method are adopted to compensate for distortions caused by hardware imperfections and fiber impairments, respectively. As a result, 60 Gbit/s polarization-multiplexed transmission over 150-km has been achieved at 3 Gsymbol/s within an optical bandwidth of only 4.05 GHz.
