2005 Fiscal Year Final Research Report Summary
Ultrahigh-speed optical transmission and signal processing utilizing nonlinear effects in fibers
| Project/Area Number |
13852010
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
情報通信工学
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| Research Institution | Osaka University |
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Principal Investigator |
MATSUMOTO Masayuki Osaka University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (10181786)
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| Co-Investigator(Kenkyū-buntansha) |
TODA Hiroyuki Doshisha University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (00202200)
MARUTA Akihiro Osaka University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (40252613)
KAWASAKI Zenichiro Osaka University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (60126852)
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| Project Period (FY) |
2001 – 2005
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| Keywords | Nonlinear optics / Optical fiber / Optical communication / Soliton / Advanced communication / Optical signal processing |
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| Research Abstract |
1. Achievements relating to ultrahigh-speed long-distance transmission utilizing fiber nonlinearities are as follows :
(1) We have demonstrated transmission of a pair of soliton pulses with separation of 12.5ps, corresponding to a bit rate of 80Gb/s, over more than 7,000km in a densely dispersion-managed (DDM) recirculating fiber loop.
(2) We have experimentally demonstrated the existence of bi-solitons, with which pulse-to-pulse interaction is eliminated, by a recirculating transmission experiment. We also examine stability of bi-solitons against variations in initial pulse parameters and applicability of bi-solitons in WDM transmission.
(3) By numerical simulations we have shown that high spectral-efficiency soliton transmission can be obtained by a combined use of doubly-periodic dispersion management and soliton transmission control. We have also shown that DDM soliton transmission with filter control realizes distance more than 5,000km at 160Gb/s but with limited effectiveness of dis
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persion compensation at the receiver end.
2. Achievements relating to optical signal processing utilizing fiber nonlinearities are as follows :
(1) We have carried out quasi-80Gb/s recirculating transmission experiment and have shown that error-free transmission distance can be extended from 300 to 1,000km by the use of an all-optical 2R regenerator based on self-phase modulation in a fiber.
(2) We have shown through a 10Gb/s transmission experiment that an all-optical limiter based on saturation of four-wave mixing in a fiber improves BER of DPSK transmission through suppression of nonlinear phase noise.
(3) We have proposed signal power to pulse number conversion based on slicing of SPM-broadened spectrum by an arrayed waveguide grating and have demonstrated all-optical two-bit AD conversion. We have also proposed and demonstrated optical DA conversion using cascaded optical switches.
(4) We have proposed and demonstrated all-optical variable delay method using temporal shifts produced by collisions between solitons with different wavelengths. Less
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