2001 Fiscal Year Final Research Report Summary
EXCELLENT TEMPERATURE CHARACTERISTIC 1.2 μm SINGLE-MODE SEMICONDUCTOR LASERS AND ITS APPLICATION TO ULTRA-HIGH SPEED OPTICAL LINKS
| Project/Area Number |
12355016
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
電子デバイス・機器工学
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
SAKAGUCHI Takahiro Tokyo Institute of Technology, Precision & Intelligence Laboratory, Research Associate, 精密工学研究所, 助手 (70215622)
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| Co-Investigator(Kenkyū-buntansha) |
UENOHARA Hiroyuki Tokyo Institute of Technology, Precision & Intelligence Laboratory, Associate Professor, 精密工学研究所, 助教授 (20334526)
MIYAMOTO Tomoyuki Tokyo Institute of Technology, Precision & Intelligence Laboratory, Associate Professor, 精密工学研究所, 助教授 (70282861)
KOYAMA Fumio Tokyo Institute of Technology, Precision & Intelligence Laboratory, Professor, 精密工学研究所, 教授 (30178397)
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| Project Period (FY) |
2000 – 2001
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| Keywords | 1.2 μm SINGLE-MODE SEMICONDUCTOR LASER / HIGH STRAINE STRUCTURE / SURFACE EMITTING LASER / EXCELLENT TEMPERATURE / HIGH SPEED OPTICAL LINK |
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| Research Abstract |
We realized the wavelength extension of GaInAs/GaAs strained quantum wells1) to open up a new wavelength band of 1.0-1.2 μm. We newly introduced a strained buffer layer and established growth conditions in MOCVD, enabling us to grow highly strained layers with a strain of over 2 %. The PL wavelength of grown GaInAa QWs could be extended to be over 1.2 μm without any degradation in crystal qualities.
We fabricated 50 μm wide broad area lasers with 1.2 μm GaInAs QWs. The lowest threshold current density of broad area lasers is 170 A/cm2 for double QWs. Figure 3 shows various L/I curves at different heat sink temperatures up to 170 ℃. A characteristic temperature T0 under is over 200 K, which is the highest at 1.2〜1.3 μm wavelength band. Ridge waveguide devices can be operated under cw operation without bonding on heat-sink. Some devices under high injection showed a lasing wavelength beyond 1.25 μm, which is the longest wavelength ever reported for the GaInAs/GaAs system.
We fabricated vertical cavity surface emitting lasers (VCSELs) with GaInAs. We achieved a threshold current of 0.9 mA, high-temperature operation of up to 170 ℃, and high reliability of 〉2000 hours. This device was grown on GaAs(311)B substrate, showing large orthogonal polarization suppression ratio (OPSR) of 30dB. We realized single longitudinal, fundamental transverse-mode and polarization in the VCSLE. The device shows an excellent temperature characteristics up to 180 ℃.
We also demonstrated a multi-wavelength VCSEL array on a patterned substrate in a wavelength band of 1.1-1.2 μm. We carried out data transmission with 2.5 Gb/s x 4 channels was achieved.
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[Publications] A.Murakami, S.Sekiguchi, T.Sakaguchi, T.Miyamoto, E.Koyama, K.Iga: "Proposal of optically pumped tunable surface emitting laser,"Jpn.J.Appl.Phys., vol.40, no.9A/B, pp.L935-L936"Jpn. J. Appl. Phys.. 40,9A/B. L935-L936 (2001)
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[Publications] Takeo Kageyama, Tomoyuki Miyamoto, Shigeki Makino, Yoshihiko Ikenaga, Nobuhiko Nishiyama, Akihiro Matsutani, Fumio Koyama, and Kenichi IgaYoshihiko Ikenaga, Nobuhiko Nishiyama, Akihiro Matsutani, Fumio Koyama, and Kenichi Iga: "Room temperature continuous-wave operation of GaInAs/GaAs VCSELs grown by chemical beam epitaxy with output power exceeding ImW"Electron. Lett.. vol. 37, no. 4. 225-226 (2001)
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