2007 Fiscal Year Final Research Report Summary
Wavelength and waveform conversion scheme of optical signal between different types of optical networks
| Project/Area Number |
18560330
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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 |
Electron device/Electronic equipment
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
KISHI Naoto The University of Electro-Communications, Faculty of Electro-communications, Associate professor (10195224)
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| Project Period (FY) |
2006 – 2007
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| Keywords | WDM optical communication / semiconductor optical amplifier / nonlinear fibre / optical wavelength conversion / optical waveform conversion / optical network |
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| Research Abstract |
The purpose of the project is to develop optical interfaces to convert the wavelength/waveform of optical signal between different optical networks. The achievements of this project are as follows.
With the use of a multi-stage semiconductor optical-amplifier based wavelength converter, large wavelength hopping over 300 nm was achieved for optical signals with bit-rates of 2.5 Gb/s and Gb/s. Waveform regeneration with inverting wavelength conversion was achieved. Multi-casting of optical signal at 1550 nm wavelength band was also demonstrated with the multi-stage wavelength converter, by which signal degradation due to nonlinear-mixing in semiconductor optical amplifier was successfully suppressed.
Pulse-width tunable waveform conversion by combination of fiber- and semiconductor-based switches was success-fully applied for NRZ(non return-to-zero) to RZ(return-to-zero) conversion. The output pulsewidth was tunable between 20 ps and 80 ps. Due to the pulsewidth conversion, transmission performance over 20 km was largely improved.
As an alternative way for pulsewith-shrinking, Raman amplifier based pulsewidth compressor was also examined. Output pulsewidth tunability for modulated signal between 13 ps and 3 ps was achieved.
As an application of waveform conversion technique with a semiconductor optical-amplifier, widely wavelength-tunable optical clock pulse generator was developed. Higher-quality optical clock pulses were obtained in comparison with conventional wavelength-tunable lightsources. Waveform optimization method with this optical clock was also found.
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