2021 Fiscal Year Final Research Report
Challenge to realize wide frequency range low phase noise semiconductor lasers
Project/Area Number |
19H02185
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 21060:Electron device and electronic equipment-related
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Research Institution | Tohoku University |
Principal Investigator |
YASAKA HIROSHI 東北大学, 電気通信研究所, 教授 (50509099)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 半導体レーザ / 狭線幅 / 高速変調 / 周波数雑音 / 位相雑音 / 光負帰還 |
Outline of Final Research Achievements |
It is confirmed experimentally that the hybrid modulation semiconductor laser with cavity length of 595 um has wide modulation bandwidth close to 80 GHz. It is also confirmed that phase noise reduction bandwidth can enlarge almost one order of magnitude by applying optical negative feedback method to the hybrid modulation semiconductor laser. It is shown numerically that the E/O modulation bandwidth of the hybrid modulation laser can enlarge up to 130 GHz and dynamic single mode operation with 100 Gbit/s NRZ signal can be realized by shortening the cavity length. It is also shown that the optical negative feedback semiconductor laser can improve the system performance of FMCW-LiDAR thanks to the laser's narrow spectral linewidth and ability of direct frequency modulation by injection current.
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Free Research Field |
光エレクトロニクス
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Academic Significance and Societal Importance of the Research Achievements |
簡便な構成で半導体レーザの発振スペクトル線幅の狭窄化(位相雑音低減)が可能な光負帰還法と周波数変調帯域の拡大が可能な混合変調半導体レーザを組み合わせることで広帯域位相雑音低減を実現した半導体レーザ光源が実現できることを明確にしたことは学術的意義の高い成果である。また実現困難とされてきたサブTbit/s NRZ信号で動的単一モード動作可能な半導体レーザの実現可能性を明確化したことも学術的意義の高い成果である。本成果によってコンパクトで超高速動作可能な半導体レーザを安価に提供できる可能性があり、光通信システムのコスト低減へ大きく貢献できる等、社会的意義の高い成果が得られた。
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