The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Hirohito Yamada - One of the best experts on this subject based on the ideXlab platform.
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Narrow Spectral Linewidth silicon photonic wavelength tunable laser diode for digital coherent communication system
IEEE Journal of Selected Topics in Quantum Electronics, 2016Co-Authors: Tomohiro Kita, Rui Tang, Hirohito YamadaAbstract:We demonstrated wavelength tunable laser diodes with Si-wire waveguide ring resonators as an external optical cavity. The footprint of the optical cavity including the semiconductor optical amplifier is as small as 0.8 mm × 0.6 mm which is less 1/10 of those made of silicon oxinitride material. Wavelength tuning range of approximately 55 nm was demonstrated, which covers entire L-band of the optical communication wavelength system. Furthermore, a Spectral Linewidth Narrower than 100 kHz was obtained by optimizing the design of the external optical cavity. The optical nonlinearity of silicon is described and the influence on laser oscillation is also discussed.
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Narrow Spectral Linewidth silicon photonic wavelength tunable laser with highly asymmetric mach zehnder interferometer
Optics Letters, 2015Co-Authors: Rui Tang, Tomohiro Kita, Hirohito YamadaAbstract:We propose a Narrow-Spectral-Linewidth silicon photonic wavelength-tunable laser with a novel external wavelength-tunable filter, which consists of two silicon ring resonators with different circumferences and a highly asymmetric Mach–Zehnder interferometer (MZI), the two optical paths of which have significantly different lengths. Calculations and experimental results indicated that the gain difference between longitudinal modes was increased by the highly asymmetric MZI. Consequently, a Narrow Spectral Linewidth of 12 kHz and a stable single-mode oscillation were obtained.
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Narrow Spectral Linewidth si photonic wavelength tunable laser diode for digital coherent optical communication
International Semiconductor Laser Conference, 2014Co-Authors: Rui Tang, Tomohiro Kita, Hirohito YamadaAbstract:A compact wavelength tunable laser diode for digital coherent optical communication was demonstrated with a wavelength tunable filter consisting of silicon photonic wire waveguides. Stable single-mode operation with 17.8 dBm maximum output power as well as less than 100 kHz Spectral line width were obtained.
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Narrow Spectral Linewidth and high output power si photonic wavelength tunable laser diode
International Conference on Group IV Photonics, 2013Co-Authors: Tomohiro Kita, Keita Nemoto, Hirohito YamadaAbstract:We fabricated wavelength tunable laser diodes with Si photonic wire waveguide ring resonators as an external optical cavity. Less than 100 kHz Narrow Spectral Linewidth was obtained with small footprint. Our wavelength tunable laser diode shows sufficient good performance for practical use in digital coherent optical transmission systems.
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Narrow Spectral Linewidth wavelength tunable laser with si photonic wire waveguide ring resonators
International Conference on Group IV Photonics, 2012Co-Authors: Keita Nemoto, Tomohiro Kita, Hirohito YamadaAbstract:We fabricated wavelength tunable laser diodes with Si-wire waveguide ring resonators as an external optical cavity. Less than 100 kHz Narrow Spectral Linewidth was obtained by optimizing design of the ring resonators. The wavelength tunable laser diodes with Narrow Spectral Linewidth are suitable as light sources for digital coherent optical transmission systems.
Tomohiro Kita - One of the best experts on this subject based on the ideXlab platform.
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Narrow Spectral Linewidth silicon photonic wavelength tunable laser diode for digital coherent communication system
IEEE Journal of Selected Topics in Quantum Electronics, 2016Co-Authors: Tomohiro Kita, Rui Tang, Hirohito YamadaAbstract:We demonstrated wavelength tunable laser diodes with Si-wire waveguide ring resonators as an external optical cavity. The footprint of the optical cavity including the semiconductor optical amplifier is as small as 0.8 mm × 0.6 mm which is less 1/10 of those made of silicon oxinitride material. Wavelength tuning range of approximately 55 nm was demonstrated, which covers entire L-band of the optical communication wavelength system. Furthermore, a Spectral Linewidth Narrower than 100 kHz was obtained by optimizing the design of the external optical cavity. The optical nonlinearity of silicon is described and the influence on laser oscillation is also discussed.
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Narrow Spectral Linewidth silicon photonic wavelength tunable laser with highly asymmetric mach zehnder interferometer
Optics Letters, 2015Co-Authors: Rui Tang, Tomohiro Kita, Hirohito YamadaAbstract:We propose a Narrow-Spectral-Linewidth silicon photonic wavelength-tunable laser with a novel external wavelength-tunable filter, which consists of two silicon ring resonators with different circumferences and a highly asymmetric Mach–Zehnder interferometer (MZI), the two optical paths of which have significantly different lengths. Calculations and experimental results indicated that the gain difference between longitudinal modes was increased by the highly asymmetric MZI. Consequently, a Narrow Spectral Linewidth of 12 kHz and a stable single-mode oscillation were obtained.
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Narrow Spectral Linewidth si photonic wavelength tunable laser diode for digital coherent optical communication
International Semiconductor Laser Conference, 2014Co-Authors: Rui Tang, Tomohiro Kita, Hirohito YamadaAbstract:A compact wavelength tunable laser diode for digital coherent optical communication was demonstrated with a wavelength tunable filter consisting of silicon photonic wire waveguides. Stable single-mode operation with 17.8 dBm maximum output power as well as less than 100 kHz Spectral line width were obtained.
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Narrow Spectral Linewidth and high output power si photonic wavelength tunable laser diode
International Conference on Group IV Photonics, 2013Co-Authors: Tomohiro Kita, Keita Nemoto, Hirohito YamadaAbstract:We fabricated wavelength tunable laser diodes with Si photonic wire waveguide ring resonators as an external optical cavity. Less than 100 kHz Narrow Spectral Linewidth was obtained with small footprint. Our wavelength tunable laser diode shows sufficient good performance for practical use in digital coherent optical transmission systems.
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Narrow Spectral Linewidth wavelength tunable laser with si photonic wire waveguide ring resonators
International Conference on Group IV Photonics, 2012Co-Authors: Keita Nemoto, Tomohiro Kita, Hirohito YamadaAbstract:We fabricated wavelength tunable laser diodes with Si-wire waveguide ring resonators as an external optical cavity. Less than 100 kHz Narrow Spectral Linewidth was obtained by optimizing design of the ring resonators. The wavelength tunable laser diodes with Narrow Spectral Linewidth are suitable as light sources for digital coherent optical transmission systems.
Yasushi Matsui - One of the best experts on this subject based on the ideXlab platform.
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high output power operation of a 1 3 µm gain coupled distributed feedback laser with Narrow Spectral Linewidth
Japanese Journal of Applied Physics, 1999Co-Authors: Y Inaba, Masato Ishino, Jun Ohya, M Kito, Yasushi MatsuiAbstract:High output power and Narrow Spectral Linewidth operation of 1.3 µm gain-coupled distributed feedback (DFB) lasers with InAsP buried absorptive grating is reported. In this study, we have investigated the effect of the thickness of a separate-confinement-heterostructure (SCH) layer on the single-mode stability and the Spectral-Linewidth property of 1.3 µm gain-coupled DFB lasers. As a result, we clarified that decreasing the thickness of the SCH layer led to stable single-mode operation at high output power and the reduction of the product of the Spectral Linewidth and the output power. For the fabricated gain-coupled DFB laser, a record high output power of 230 mW and a minimum Spectral Linewidth of 100 kHz at an output power of 150 mW were realized.
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gain coupled dfb lasers with reduced optical confinement for Narrow Spectral Linewidth
International Semiconductor Laser Conference, 1998Co-Authors: Y Inaba, M Kito, J Ohya, M Ishino, Yasushi MatsuiAbstract:Effect of reducing optical confinement in DFB lasers on Spectral Linewidth as well as single-mode stability are clarified, for the first time. A Narrow Spectral-Linewidth of 74 kHz, which is the Narrowest ever reported in gain-coupled DFB lasers, is realized.
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high output power and Narrow Spectral Linewidth operation of a 1 3 spl mu m gain coupled dfb laser with inasp buried absorptive grating
IEEE Photonics Technology Letters, 1998Co-Authors: Y Inaba, Jun Ohya, M Kito, R Ishino, Yasushi MatsuiAbstract:High output-power and Narrow Spectral-Linewidth operation of 1.3-/spl mu/m gain-coupled distributed feedback lasers with grating are reported. The fabricated output power of 230 mW and a Linewidth of 100 kHz by reducing optical confinement in multiple quantum wells to improve the single-mode stability at high output-power operation.
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high output power operation of 1 3 spl mu m gain coupled dfb laser with Narrow Spectral Linewidth
International Conference on Indium Phosphide and Related Materials, 1998Co-Authors: Y Inaba, Masato Ishino, M Kito, J Ohya, Yasushi MatsuiAbstract:High output-power and Narrow Spectral-Linewidth operation of 1.3 /spl mu/m gain-coupled distributed feedback (DFB) lasers with InAsP buried absorptive grating are reported. In this report, we have investigated the effect of the thickness of separate-confinement-heterostructure (SCH) layer on the Spectral Linewidth. As a result, it was clarified that decreasing the thickness of SCH layer is effective to reduce the Spectral Linewidth. For the fabricated laser, a record high output-power of 230 mW and a minimum Spectral-Linewidth of 100 kHz was realized.
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Narrow Spectral Linewidth semiconductor lasers
Optical and Quantum Electronics, 1992Co-Authors: T Kunii, Yasushi MatsuiAbstract:Developments of Narrow-Linewidth distributed-Bragg-reflection (DBR) and distributed-feed-back (DFB) lasers are described. The design of a Narrow-Linewidth DBR laser is described in detail. Kl optimization from the viewpoint of Narrow-Linewidth operation and stable single mode operation is discussed. The Linewidth dependences on cavity length, facet reflectivity and threshold current density are investigated. Some approaches to suppressing spatial hole burning in DFB lasers are described.
Rui Tang - One of the best experts on this subject based on the ideXlab platform.
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Narrow Spectral Linewidth silicon photonic wavelength tunable laser diode for digital coherent communication system
IEEE Journal of Selected Topics in Quantum Electronics, 2016Co-Authors: Tomohiro Kita, Rui Tang, Hirohito YamadaAbstract:We demonstrated wavelength tunable laser diodes with Si-wire waveguide ring resonators as an external optical cavity. The footprint of the optical cavity including the semiconductor optical amplifier is as small as 0.8 mm × 0.6 mm which is less 1/10 of those made of silicon oxinitride material. Wavelength tuning range of approximately 55 nm was demonstrated, which covers entire L-band of the optical communication wavelength system. Furthermore, a Spectral Linewidth Narrower than 100 kHz was obtained by optimizing the design of the external optical cavity. The optical nonlinearity of silicon is described and the influence on laser oscillation is also discussed.
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Narrow Spectral Linewidth silicon photonic wavelength tunable laser with highly asymmetric mach zehnder interferometer
Optics Letters, 2015Co-Authors: Rui Tang, Tomohiro Kita, Hirohito YamadaAbstract:We propose a Narrow-Spectral-Linewidth silicon photonic wavelength-tunable laser with a novel external wavelength-tunable filter, which consists of two silicon ring resonators with different circumferences and a highly asymmetric Mach–Zehnder interferometer (MZI), the two optical paths of which have significantly different lengths. Calculations and experimental results indicated that the gain difference between longitudinal modes was increased by the highly asymmetric MZI. Consequently, a Narrow Spectral Linewidth of 12 kHz and a stable single-mode oscillation were obtained.
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Narrow Spectral Linewidth si photonic wavelength tunable laser diode for digital coherent optical communication
International Semiconductor Laser Conference, 2014Co-Authors: Rui Tang, Tomohiro Kita, Hirohito YamadaAbstract:A compact wavelength tunable laser diode for digital coherent optical communication was demonstrated with a wavelength tunable filter consisting of silicon photonic wire waveguides. Stable single-mode operation with 17.8 dBm maximum output power as well as less than 100 kHz Spectral line width were obtained.
Tatsuo Harada - One of the best experts on this subject based on the ideXlab platform.
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corrugation pitch modulated mqw dfb lasers with Narrow Spectral Linewidth
IEEE Journal of Quantum Electronics, 1991Co-Authors: Makoto Okai, K Uomi, T. Tsuchiya, Naoki Chinone, Tatsuo HaradaAbstract:Narrow Spectral Linewidth lasers are developed for optical coherent transmission systems. To obtain a Narrow Spectral Linewidth, a CPM (corrugation-pitch modulated) structure is introduced into 1200- mu m-long MQW-DFB (multi-quantum well distributed feedback) lasers. The CPM structure effectively suppresses the axial spatial hole burning effect and stabilized single-mode spectrum at high output powers. A Spectral Linewidth of 170 kHz was achieved at an output power of 25 mW. Details of corrugation fabrication method that makes the CPM structure possible are described. >
