2005 Fiscal Year Final Research Report Summary
Nonlinear dynamics of optical fiber laser with feedback and its applications
| Project/Area Number |
15560027
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Ibaraki University |
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Principal Investigator |
IMAI Yoh Ibaraki University, College of Engineering, Dept.of Electrical and Electronic Eng., Professor, 工学部, 教授 (20151665)
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| Project Period (FY) |
2003 – 2005
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| Keywords | fiber laser / nonlinear dynamics / optical chaos / chaos synchronization / chaos secure communication / optical fiber ring resonator / optical chaos sensing |
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| Research Abstract |
In this research, first, a new model incorporating a feedback effect in erbium-doped fiber ring laser (EDFL) and its basic element of optical fiber ring resonator (OFRR) is proposed and is analyzed. As a result, a region of chaos state narrows, though a region off quasi-periodic state broadens as the input power increases in EDFL and OFRR with feedback. In addition, complicated dynamics in EDFL tend to appear easily with a decrease in temperature. Next, the nonlinear dynamics obtained are applied to master-slave and slave-slave chaos synchronization, and to message modulation type chaos secure communication. Here, the chaos synchronization characteristics and the decryption characteristics are clarified. Finally, the OFRR chaos is applied to optical sensing which is based on the periodic dependence of minimum input power for chaos output on temperature and pressure, and optical chaos temperature and pressure sensing is proposed. Especially, a new measurement method of nonlinear refractive index of optical fiber by using spectral ratio of nonlinear output in OFRR is proposed.
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