2001 Fiscal Year Final Research Report Summary
Wideband Optical Fiber Amplifiers and Lasers for WDM Systems
| Project/Area Number |
12450138
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電子デバイス・機器工学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YAMASHITA Shinji The University of Tokyo, Dept. of Frontier Informatics, Associate Professor, 大学院・新領域創成科学研究科, 助教授 (40239968)
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| Co-Investigator(Kenkyū-buntansha) |
HOTATE Kazuo The University of Tokyo、Dept. of Electronic Engineering, Professor, 大学院・工学系研究科, 教授 (60126159)
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| Project Period (FY) |
2000 – 2001
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| Keywords | Fiber amplifiers / Fiber lasers / Fiber wavelength convderters / FBG's / Waveform regenerators / WDM systems / Mode locking / Injectiion locking |
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| Research Abstract |
Wideband optical devices, especially wideband optical fiber amplifiers and lasers are crucial for WDM optical fiber systems. This project aims at realizing wideband optical fiber devices, such as fiber amplifiers, fiber lasers, fiber wavelength converters, and fiber Bragg gratings (FBG's). Additionally, wave form regenerators using semiconductor lasers are also studied.
(1) Fiber amplifiers : We proposed novel L-band fiber amplifiers incorporating an mime C-band FBG laser, and demonstrated their wide bandwidth.
(2) Fiber lasers : We realized wavelength-spacing-tunable multiwavelength fiber lasers. And we applied this technique to fiber dispersion measurement, distributed pressure sensing, realization of reconfigurable optical filters, and FBG laser sensor systems. We also realized multiwavelength, mode-locked fiber lasers.
(3) Fiber wavelength converters: Conversion efficiency in wavelength converters utilizing four-wave mixing (FWM) in optical fibers can be enhanced by the spread spectru
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m (SS) scheme, but the spectrum of the converted light is also spread We proposed and demonstrated a novel highly-efficient wavelength conversion technique based on synchronous phase or frequency modulations of both pump and signal lights. We could achieve the very wide (60nm) conversion bandwidth and very high efficiency (-0.3dB). We demonstrated its high performance in a 10Gb/s transmission experiment.
(4) FBG's : The FBG has sharp band-reflection characteristics, therefore essential for WDM systems. We investigated novel structured FBG's, and novel fabrication techniques. We proposed a novel and useful technique to realize dense superstructured-FBG (SSFBG) for DWDM systems, multiple phase shift (MPS) technique.
(5) Waveform regenerators : We proposed and demonstrated a novel wave form regenerator based on injection locking of a distributed-feedback semiconductor laser. We showed that the side-mode injection locking techinique should be used because the optical filtering is easier and the relaxation oscillation can be suppressed. We successfully demonstrate the error-free regeneration of up to 10Gb/s signal. Less
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