The Experts below are selected from a list of 16533 Experts worldwide ranked by ideXlab platform
Toshio Watanabe - One of the best experts on this subject based on the ideXlab platform.
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wavelength tunable filters utilizing arrayed waveguide gratings for colorless directionless contentionless optical Signal Drop in roadms
IEEE Photonics Journal, 2015Co-Authors: Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio WatanabeAbstract:The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-Drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.
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Wavelength-Tunable Filters Utilizing Arrayed Waveguide Gratings for Colorless/Directionless/Contentionless Optical Signal Drop in ROADMs
IEEE Photonics Journal, 2015Co-Authors: Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio WatanabeAbstract:The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-Drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.
Ken-ichi Sato - One of the best experts on this subject based on the ideXlab platform.
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Wavelength-Division Demultiplexing Enhanced by Silicon-Photonic Tunable Filters in Ultra-Wideband Optical-Path Networks
Journal of Lightwave Technology, 2020Co-Authors: Yojiro Mori, Shu Namiki, Eiji Honda, Ryuta Shiraki, Keijiro Suzuki, Hiroyuki Matsuura, Hitoshi Kawashima, Kazuhiro Ikeda, Ken-ichi SatoAbstract:With the recent growth of network traffic demands, a high-capacity optical-path network based on reconfigurable optical add-Drop multiplexers (ROADMs) is highly desirable. Among the various technologies available, extending the useable frequency band is one of the most promising solutions since it can enlarge the network capacity with relatively small Signal-quality degradation. However, increasing the number of wavelength Signals detracts flexible Signal-Drop capabilities of the ROADM because the effective dynamic range of the digital coherent receiver is restricted by the number of wavelength Signals input to the receiver. To overcome this difficulty, we adopt the ROADM structure that sets an optical wavelength-tunable filter in front of each receiver. This scheme retains the effective receiver dynamic range even if a large number of wavelength Signals are multiplexed. In this paper, we demonstrate flexible Signal Drop in a C+L-band optical-path network by using an optical wavelength-tunable filter implemented on a single silicon-photonic chip. The prototype filter is monolithically implemented in conjunction with an input-port selector so as to reduce the total system loss. The filter comprises multiple asymmetric Mach-Zehnder interferometers for wavelength tuning and symmetric Mach-Zehnder interferometers for input-port selection. Its effectiveness is experimentally confirmed by measuring the bit-error ratios of 32-Gbaud/100-Gbps dual-polarization quadrature-phase-shift-keying Signals and 32-Gbaud/200-Gbps dual-polarization 16-ary quadrature-amplitude-modulation Signals. A single wavelength Signal is extracted out of 285 wavelength Signals multiplexed over the C+L band and successfully demodulated with negligible penalty in terms of the optical Signal-to-noise ratio. The net fiber capacity reaches 57 Tbps.
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OFC - Optical tunable filter for gridless ROADM
Optical Fiber Communication Conference, 2017Co-Authors: Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi SatoAbstract:We fabricate an optical tunable filter for gridless Signal Drop in ROADMs. Its effectiveness is confirmed by experiments on 10-Gbaud intensity-modulated Signals with 50-GHz spacing and 32-Gbaud dual-polarization QPSK and 16QAM Signals with 33.3-GHz spacing.
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wavelength tunable filters utilizing arrayed waveguide gratings for colorless directionless contentionless optical Signal Drop in roadms
IEEE Photonics Journal, 2015Co-Authors: Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio WatanabeAbstract:The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-Drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.
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Wavelength-Tunable Filters Utilizing Arrayed Waveguide Gratings for Colorless/Directionless/Contentionless Optical Signal Drop in ROADMs
IEEE Photonics Journal, 2015Co-Authors: Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio WatanabeAbstract:The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-Drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.
Yojiro Mori - One of the best experts on this subject based on the ideXlab platform.
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Wavelength-Division Demultiplexing Enhanced by Silicon-Photonic Tunable Filters in Ultra-Wideband Optical-Path Networks
Journal of Lightwave Technology, 2020Co-Authors: Yojiro Mori, Shu Namiki, Eiji Honda, Ryuta Shiraki, Keijiro Suzuki, Hiroyuki Matsuura, Hitoshi Kawashima, Kazuhiro Ikeda, Ken-ichi SatoAbstract:With the recent growth of network traffic demands, a high-capacity optical-path network based on reconfigurable optical add-Drop multiplexers (ROADMs) is highly desirable. Among the various technologies available, extending the useable frequency band is one of the most promising solutions since it can enlarge the network capacity with relatively small Signal-quality degradation. However, increasing the number of wavelength Signals detracts flexible Signal-Drop capabilities of the ROADM because the effective dynamic range of the digital coherent receiver is restricted by the number of wavelength Signals input to the receiver. To overcome this difficulty, we adopt the ROADM structure that sets an optical wavelength-tunable filter in front of each receiver. This scheme retains the effective receiver dynamic range even if a large number of wavelength Signals are multiplexed. In this paper, we demonstrate flexible Signal Drop in a C+L-band optical-path network by using an optical wavelength-tunable filter implemented on a single silicon-photonic chip. The prototype filter is monolithically implemented in conjunction with an input-port selector so as to reduce the total system loss. The filter comprises multiple asymmetric Mach-Zehnder interferometers for wavelength tuning and symmetric Mach-Zehnder interferometers for input-port selection. Its effectiveness is experimentally confirmed by measuring the bit-error ratios of 32-Gbaud/100-Gbps dual-polarization quadrature-phase-shift-keying Signals and 32-Gbaud/200-Gbps dual-polarization 16-ary quadrature-amplitude-modulation Signals. A single wavelength Signal is extracted out of 285 wavelength Signals multiplexed over the C+L band and successfully demodulated with negligible penalty in terms of the optical Signal-to-noise ratio. The net fiber capacity reaches 57 Tbps.
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OFC - Optical tunable filter for gridless ROADM
Optical Fiber Communication Conference, 2017Co-Authors: Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi SatoAbstract:We fabricate an optical tunable filter for gridless Signal Drop in ROADMs. Its effectiveness is confirmed by experiments on 10-Gbaud intensity-modulated Signals with 50-GHz spacing and 32-Gbaud dual-polarization QPSK and 16QAM Signals with 33.3-GHz spacing.
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wavelength tunable filters utilizing arrayed waveguide gratings for colorless directionless contentionless optical Signal Drop in roadms
IEEE Photonics Journal, 2015Co-Authors: Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio WatanabeAbstract:The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-Drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.
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Wavelength-Tunable Filters Utilizing Arrayed Waveguide Gratings for Colorless/Directionless/Contentionless Optical Signal Drop in ROADMs
IEEE Photonics Journal, 2015Co-Authors: Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio WatanabeAbstract:The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-Drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.
Shoichi Takashina - One of the best experts on this subject based on the ideXlab platform.
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wavelength tunable filters utilizing arrayed waveguide gratings for colorless directionless contentionless optical Signal Drop in roadms
IEEE Photonics Journal, 2015Co-Authors: Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio WatanabeAbstract:The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-Drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.
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Wavelength-Tunable Filters Utilizing Arrayed Waveguide Gratings for Colorless/Directionless/Contentionless Optical Signal Drop in ROADMs
IEEE Photonics Journal, 2015Co-Authors: Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio WatanabeAbstract:The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-Drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.
Hiroshi Hasegawa - One of the best experts on this subject based on the ideXlab platform.
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OFC - Optical tunable filter for gridless ROADM
Optical Fiber Communication Conference, 2017Co-Authors: Masaki Niwa, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi SatoAbstract:We fabricate an optical tunable filter for gridless Signal Drop in ROADMs. Its effectiveness is confirmed by experiments on 10-Gbaud intensity-modulated Signals with 50-GHz spacing and 32-Gbaud dual-polarization QPSK and 16QAM Signals with 33.3-GHz spacing.
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wavelength tunable filters utilizing arrayed waveguide gratings for colorless directionless contentionless optical Signal Drop in roadms
IEEE Photonics Journal, 2015Co-Authors: Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio WatanabeAbstract:The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-Drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.
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Wavelength-Tunable Filters Utilizing Arrayed Waveguide Gratings for Colorless/Directionless/Contentionless Optical Signal Drop in ROADMs
IEEE Photonics Journal, 2015Co-Authors: Shoichi Takashina, Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Toshio WatanabeAbstract:The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-Drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.