Automatically-Controlled C-Band Wavelength Conversion with Constant Output Power Based on Four-Wave Mixing in SOA's(Lasers, Quantum Electronics)
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概要
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We demonstrate the C-band wavelength conversion unit having functions of automatic wavelength recognition, power equalization, and elimination of original signal and pumping light for the first time, which is based on four-wave mixing (FWM) in semiconductor optical amplifiers (SOA's). The constructed unit automatically detects signal wavelength, sweeps wavelength of a pumping light, and adjusts center wavelengths of band pass filters and gain values of erbium-doped fiber amplifiers (EDFA's), in order to convert the wavelength of the signal to the arbitrary wavelength we set, and eliminate the original signal and pumping light after conversion. Amplification of the signal, pumping, and wavelength-converted lights compensates the detuning dependence of conversion efficiency and its asymmetry in the quantum-well (QW) SOA, to keep the power of the wavelength-converted light constant within the whole C-band region. The switching time of wavelength conversion by the unit is about a second, which is dominated by mechanical movement of the tunable filters. Wavelength-converted 2.5 and 10 Gb/s NRZ signals show clear eye-openings when the detuning is positive (ω_p>ω_s), and a 2-ps pulse train is also successfully wavelength-converted. To overcome the problem of the asymmetric conversion efficiency in the QW-SOA, we adopted quantumdot (QD) SOA's. Although the 1.5μm QD-SOA still shows its asymmetry, which will be improved by optimization of quantum dot structure, wavelength conversion of a 160 Gb/s RZ signal is demonstrated by the QD-SOA's. More improvement of the performance of the wavelength conversion unit should be possible by making switching time faster and installing the optimized QD-SOA's.
- 社団法人電子情報通信学会の論文
- 2005-12-01
著者
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AKIYAMA Tomoyuki
Fujitsu Laboratories Ltd.
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Ebe Hiroji
Fujitsu Laboratories Ltd.
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Sugawara Mitsuru
Fujitsu Limited And Fujitsu Laboratories Limited
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Akiyama Tomoyuki
Qd Laser Inc.
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Ebe H
Univ. Tokyo Tokyo Jpn
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Hatori Nobuaki
Institute Of Industrial Science (iis) The University Of Tokyo
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OTSUBO Koji
Fujitsu Ltd.
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KUWATSUKA Haruhiko
Fujitsu Ltd.
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EBE Hiroji
Institute of Industrial Science (IIS), The University of Tokyo
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SUGAWARA Mitsuru
Institute of Industrial Science (IIS), The University of Tokyo
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Kuwatsuka Haruhiko
Fujitsu Laboratories Ltd.
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Sugawara Mitsuru
Institute Of Industrial Science (iis) The University Of Tokyo
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Ebe Hiroji
Institute Of Industrial Science (iis) The University Of Tokyo
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HATORI Nobuaki
Institute for Photonics-Electronics Convergence System Technology (PECST)
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