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TRANSMISSION DEVICE AND TRANSMISSION METHOD

Foreign code F170009006
File No. (S2015-1988-N45)
Posted date Mar 29, 2017
Country WIPO
International application number 2016JP073965
International publication number WO 2017030137
Date of international filing Aug 17, 2016
Date of international publication Feb 23, 2017
Priority data
  • P2015-162724 (Aug 20, 2015) JP
Title TRANSMISSION DEVICE AND TRANSMISSION METHOD
Abstract In mode-space multidimensional modulation, synchronism of received signals is maintained, and the digital signal processing load required to process delay differences between received signals resulting from group velocity differences between modes is significantly reduced. In multidimensional modulation, the number of bits per symbol is increased without significantly reducing the gap between symbols in modulation space, and the ratio of signal strength to noise (S/N ratio) is increased. According to the present invention, the number of dimensions in the modulation space is increased by employing, as a multidimensional modulation space for performing modulation, inter-mode phases and inter-polarization phases which are not conventionally used. Further, a plurality of amplitudes and phases in degenerate orthogonal polarization modes of high-order modes of multi-mode fibers are used as a multidimensional modulation space. Using inter-mode phases and inter-polarization phases as modulation spaces increases the number of modulation dimensions for multidimensional modulation, and increases the amount of transmission information per symbol.
Outline of related art and contending technology BACKGROUND ART
A large capacity in the optical communication technology, other single-mode fiber as the transmission medium, the transmission capacity is greater than the number of multiplexing mode and will be used and the fiber mode. Enabling the transmission of the fiber as multiple modes, having a core diameter of multimode fiber or a thick, single-mode fiber core diameter multi-mode fiber is an intermediate mode in which the number of optical fiber. Of the optical mode in which the number of less than about 10 different modes of propagation are a plurality of multiplex transmission mode information is loaded. In the multiplex transmission mode, transmission of a plurality of single-mode signal to be multiplexed in the multi-mode multi-mode signal and a transmission channel, the reception side received in a plurality of single-mode mode multiplexing signal of the demultiplexed signal after decoding.
Has a large capacity optical fiber communication for multi-level modulation techniques in addition to the multi-dimensional modulation techniques have been proposed. Stokes space multi-dimensional space using the polarization modulation of 3 (Non-Patent Document 1) or three-dimensional multi-level modulation, the modulation a higher-order mode used in the space (non-patent document 2, 3) the multi-dimensional modulation is proposed.
It should be noted that, here, the multi-mode optical fiber of the plurality of signal light in a plurality of different propagation mode multiplexing transmission in which transmission, a plurality of the state of the multi-level modulation is associated with a plurality of transmission and modulation, the modulation space is multi-dimensional modulation of the code space with a mathematical three-dimensional space.
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY
  • Inventor
  • KOKUBUN, Yasuo
  • WATANABE, Tatsuhiko
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JP KE KG KN KP KR KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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