2006 Fiscal Year Final Research Report Summary
An experimental study of the multifiber WDM networks
| Project/Area Number |
17560327
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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 |
Communication/Network engineering
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| Research Institution | Akita University |
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Principal Investigator |
OBARA Hitoshi Akita University, Department of Electrical and Electronic Engineering, Associate Professor, 工学資源学部, 助教授 (50344768)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Communication network / Optical fiber / WDM / IP over WDM / Optical networks / bidirectional transmission / Back scattering / Power penalty |
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| Research Abstract |
We experimentally proved that a bidirectional WDM transmission technique is effective for the multifiber WDM networks to improve wavelength efficiency. Our main results are as follows :
(1) Experimental analysis of Rayleigh backscattering (RB) noise
Although basic properties of RB noise have been known, we experimentally analyzed it for the references of the following experiments and theoretical analysis. We developed an experimental set-up composed of a single fiber section with 80-km fiber and an optical amplifier. First of all, we measured RB coefficient, which was-30 dB. Then, we measured degree and state of polarization (DOP and SOP) of RB noise. We confirmed that DOP was nearly 1/3 and SOP of RB noise was identical to the original optical signal, both as expected. Finally we measured power spectrum of RB noise after OE conversion. It had an identical shape to that of the original signal, again as expected. As a result, we experimentally proved that basic parameters of RB noise used
… More
in theoretical analysis were valid.
(2) Experimental analysis of additive law of RB noise
Theoretical analysis of RB noise assumed multiple amplified optical repeater sections, each of which contains a long fiber. Building exact experimental set-up requires, many optical components to compel us substantial budget. Instead, we confirmed that RB noise generated in different fiber sections add in their power. Thus, we developed a simple experimental set-up of a single fiber section with an optical amplifier of variable gain for emulating accumulated RB noise from multiple fiber sections.
(3) Experimental analysis of power penalty (PP) due to RB noise
We measured PP in the experimental set-up described above. We compared the experimental results to theoretical results. We found a substantial difference between them. We believe that experimental results are trustworthy because they have been evaluated in a well-prepared situation. We are going to review theoretical analysis of PP due to RB noise. Less
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Research Products
(9 results)
