The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
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.
Francesco Testa - One of the best experts on this subject based on the ideXlab platform.
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Polarization insensitive silicon photonic ROADM with selectable communication direction for radio access networks.
Optics letters, 2016Co-Authors: Vito Sorianello, Gabriele De Angelis, Tommaso Cassese, Massimo Valerio Preite, Philippe Velha, Alberto Bianchi, Marco Romagnoli, Francesco TestaAbstract:We report on an experimental prototype of a low-cost silicon photonic reconfigurable optical add/drop multiplexer (ROADM). The device is able to operate with up to 12 Wavelength division multiplexing channels. In order to control the polarization of the multi-Wavelength Signal at the input of the device, an integrated polarization controller is investigated as an alternative to the polarization diversity device architecture. The integrated ROADM is equipped with optical switches for the selection of the path direction and variable optical attenuators for optical power control. We demonstrate the polarization insensitive routing of 10 Gb/s channels between two ROADM nodes with error-free transmission.
A. Souriau - One of the best experts on this subject based on the ideXlab platform.
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An empirical search for short-Wavelength heterogeneities in D″ using ISC P delays
Physics of the Earth and Planetary Interiors, 1995Co-Authors: G. Poupinet, A. SouriauAbstract:Abstract The spectrum of the heterogeneities in the D″ layer at the base of the mantle is investigated using a comparison of P delays for rays bottoming respectively inside and above D″. Data come from the International Seismological Centre (ISC) bulletins. They reveal a decoupling between D″ and the overlying structures, and the presence in D″ of a short-Wavelength Signal which may contaminate global tomographic models.
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.
Mohd Adzir Mahdi - One of the best experts on this subject based on the ideXlab platform.
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Millimeter wave carrier generation based on a double-Brillouin-frequency spaced fiber laser
Optics express, 2012Co-Authors: Y. G. Shee, Mohammed Hayder Al-mansoori, Syamsuri Yaakob, A. Man, A. K. Zamzuri, F. R. Mahamd Adikan, Mohd Adzir MahdiAbstract:An all-optical generation of a millimeter wave carrier from a multiWavelength Brillouin-erbium fiber laser is presented. Four-channel output with spacing of about 21.5 GHz is generated from the fiber laser by controlling the gain in the cavity. A dual-Wavelength Signal with spacing correspondent to six orders of Brillouin frequency shift is obtained by suppressing the two channels at the middle. Heterodyning these Signals at the high-speed photodetector produces a millimeter wave carrier at 64.17 GHz. Temperature dependence characteristic of Brillouin frequency shift realize the flexibility of generated millimeter wave frequency to be tuned at 6.6 MHz/ °C.
