2001 Fiscal Year Final Research Report Summary
Research on Integrated Nonlinear Optic Quasi-Phase-Matched Wavelength Conversion Devices for Wavelength-Division-Multiplexing Optical Communication of Next Generation
| Project/Area Number |
12555012
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Osaka University |
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Principal Investigator |
SUHARA Toshiaki Graduate School of Engineering, Osaka University, Associate Professor, 大学院・工学研究科, 助教授 (90116054)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIMURA Masatoshi Graduate School of Engineering, Osaka University, Research Associate, 大学院・工学研究科, 助手 (80263218)
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| Project Period (FY) |
2000 – 2001
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| Keywords | Optical communication / Wavelength Division Multiplexing / Nonlinear Optics / Quasi-Phase Matching / Optical Wavelength Conversion / Optical Switching / Optical Waveguide / Difference Frequency Generation |
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| Research Abstract |
Design, fabrication, and evaluation of quasi-phase matched waveguide nonlinear-optic wavelength conversion devices for future photonic network and their applications to ultrafast optical signal processing were studied. The obtained results are summarized as follows.
1 Elementary fabrication techniques were established and improved. Technique to form high-quality ferroelectric domain- inverted gratings for quasi-phase matching up to 30 X 25 mm^2 area was established. Possibility of forming domain inverted gratings of submicrion period was shown. Technique to fabricate low-loss Zn-diffused LiNbO_3 waveguides was developed.
2 Technique for designing wavelength conversion devices of difference-frequency generation type was established. In the standard configuration, normalized conversion efficiency of 324 %/W was obtained. In a high-index cladding waveguide type proposed for improvement of efficiency, an efficiency as high as 790 %/W was accomplished.
3 A new device construction was proposed for polarization-independent wavelength conversion. As a preliminary experiment, a QPM device was fabricated using a Zn : LiNbO_3O waveguide, and SHG efficiency of 15 %/W was demonstrated.
4 As applications to ultrafast optical signal processing for optical communication, an optical switch based on cascaded second-harmonic generation and difference-frequency generation, and an optical gate switch based on an integrated interferometer and sum-frequency generation device, were proposed and fabricated. Picosecond optical switching was demonstrated.
5 Integrated high-power semiconductor lasers for application as a pump-wave source for the wavelength convension devices were studied. A high-power external-cavity tunable laser was proposed and fabricated. Output power of 105 mW, wavelength tuning rage of 22 nm and nearly-diffraction-limited collimated beam output were demonstrated.
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