Presentation 2015-08-27
Full set mode analysis of three mode fibers calculated from polarization components of Near-Field Pattern
Yasuo Kokubun, Tatsuhiko Watanabe, Kohei Morita, Ryo Kawata,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) We propose and demonstrate a novel mode analysis method which can obtain a full set of amplitude excitation ratio, phase, and polarization state of guided modes including degenerate modes in few mode fibers. The method is based on the calculation of amplitude components and phase differences from the intensity profiles passed through a polarizer with angles 0$^{o}$, 45$^{o}$ and 90$^{o}$. The accuracy of calculation formulas are shown to be less than $10^{-10}$ for amplitudes and $10^{-3}$ [rad] for phase differences by simulation. The method was applied to a graded-index three mode fiber and the off axis mode excitation ratio characteristics were compared with the theoretical ones. Lastly a high-speed mode analyzer by coherent detection with polarization beam splitter and quadrant detector is proposed. In addition, a novel multi-dimensional multi-level mode-space modulation scheme utilizing the high-speed mode analyzer is also proposed.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Few mode fiber / Mode division multiplexing / Mode analysis / Mode excitation ratio / Polarization state / Coherent detection / Quadrant photodetector / Multi-dimensional multi-level transmission
Paper # OCS2015-34
Date of Issue 2015-08-20 (OCS)

Conference Information
Committee OFT / OCS
Conference Date 2015/8/27(2days)
Place (in Japanese) (See Japanese page)
Place (in English)
Topics (in Japanese) (See Japanese page)
Topics (in English)
Chair Hiroshi Naruse(Mie Univ.) / Kiyoshi Fukuchi(NEC)
Vice Chair / Akira Hirano(NTT)
Secretary (NTT) / Akira Hirano(Fujikura)
Assistant Terutake Kobayashi(Fujikura) / Hidenobu Hirota(NTT)

Paper Information
Registration To Technical Committee on Optical Fiber Technology / Technical Committee on Optical Communication Systems
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Full set mode analysis of three mode fibers calculated from polarization components of Near-Field Pattern
Sub Title (in English)
Keyword(1) Few mode fiber
Keyword(2) Mode division multiplexing
Keyword(3) Mode analysis
Keyword(4) Mode excitation ratio
Keyword(5) Polarization state
Keyword(6) Coherent detection
Keyword(7) Quadrant photodetector
Keyword(8) Multi-dimensional multi-level transmission
1st Author's Name Yasuo Kokubun
1st Author's Affiliation Yokohama National University(Yokohama Nat'l Univ.)
2nd Author's Name Tatsuhiko Watanabe
2nd Author's Affiliation Yokohama National University(Yokohama Nat'l Univ.)
3rd Author's Name Kohei Morita
3rd Author's Affiliation Yokohama National University(Yokohama Nat'l Univ.)
4th Author's Name Ryo Kawata
4th Author's Affiliation Yokohama National University(Yokohama Nat'l Univ.)
Date 2015-08-27
Paper # OCS2015-34
Volume (vol) vol.115
Number (no) OCS-201
Page pp.pp.19-24(OCS),
#Pages 6
Date of Issue 2015-08-20 (OCS)