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TRANSMISSION DEVICE AND TRANSMISSION METHOD

外国特許コード F170009006
整理番号 (S2015-1988-N45)
掲載日 2017年3月29日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2016JP073965
国際公開番号 WO 2017030137
国際出願日 平成28年8月17日(2016.8.17)
国際公開日 平成29年2月23日(2017.2.23)
優先権データ
  • 特願2015-162724 (2015.8.20) JP
発明の名称 (英語) TRANSMISSION DEVICE AND TRANSMISSION METHOD
発明の概要(英語) 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.
特許請求の範囲(英語) [claim1]
1. In the transmission device where it designates several mode fibers as the transmission line, uses higher mode of the front numeration mode fiber for the irregularity space and transmits,
Correspondence it does to attach to each coordinate which becomes settled with parameter of the particular multidimensional irregularity space at the time of the mode irregularity of the transmission section, the mode propagation of the transmission line, and mode recovering of the reception section, information of many-valued transmission, vis-a-vis the plural amplitudes of degeneracy orthogonal polarized light mode of higher mode of the front numeration mode fiber and the multidimensional irregularity space which designates phase as parameter, that the transmission with multidimensional many-valued mode irregularity is done it features, the transmission device.
[claim2]
2. In the higher mode of the front numeration mode fiber the multidimensional irregularity space which designates phase as parameter making use of with the LP mode and the orthogonal polarized light component of degeneracy mode, vis-a-vis the amplitude of the aforementioned each degeneracy mode and, information of many-valued transmission the multidimensional many-valued mode irregularity which in each coordinate of the aforementioned multidimensional irregularity space correspondence is attached the transmission section which transmits the signal light which does and,
The aforementioned signal light is received, the aforementioned multidimensional many-valued mode the interference light which corresponds to each coordinate of the multidimensional irregularity space which is modulated is detected with coherent detection,
The orthogonal polarized light component is separated the description above from the interference light which is detected due to polarized wave separation,
Amplitude and phase difference of degeneracy orthogonal polarized light mode doing the multidimensional many-valued mode recovery which recovers from the aforementioned degeneracy orthogonal polarized light component, it features that it has the reception section which outputs the information of the aforementioned transmission, in claim 1 the transmission device of statement.
[claim3]
3. In the transmission method of designating several mode fibers as the transmission line, using higher mode of the front numeration mode fiber for the irregularity space and transmitting,
Correspondence it does to attach to each coordinate which becomes settled with parameter of the particular multidimensional irregularity space mode irregularity, at the time of mode propagation, and mode recovering, information of many-valued transmission, vis-a-vis the amplitude of plural degeneracy orthogonal polarized light modes of higher mode of the front numeration mode fiber and the multidimensional irregularity space which designates phase as parameter, that the transmission with multidimensional many-valued mode irregularity is done it features, transmission method.
[claim4]
4. In transmitting end, in the higher mode of the front numeration mode fiber information of many-valued transmission correspondence is attached the multidimensional many-valued mode irregularity which is done in each coordinate of the aforementioned multidimensional irregularity space the multidimensional irregularity space which designates phase as parameter making use of with the LP mode and the orthogonal polarized light component of degeneracy mode, vis-a-vis the amplitude of the aforementioned each degeneracy mode and, the signal light which is obtained with multidimensional many-valued mode irregularity is transmitted,
In receiving end, the aforementioned signal light is received, the aforementioned multidimensional many-valued mode the interference light which corresponds to each coordinate of the multidimensional irregularity space which is modulated is detected with coherent detection,
The orthogonal polarized light component is separated the description above from the interference light which is detected due to polarized wave separation,
Amplitude and phase difference of degeneracy orthogonal polarized light mode doing the multidimensional many-valued mode recovery which recovers from the aforementioned orthogonal polarized light component, it features that it outputs the information of the aforementioned transmission, in claim 3 transmission method of statement.
[claim5]
5. Several mode fibers are designated as the transmission line, higher mode of the front numeration mode fiber is used for the irregularity space and in the transmitter which information of transmission is transmitted,
The illuminant of conveying light, the aforementioned conveying light having the optical turnout which diverges in plural divergence lights, and the multidimensional many-valued mode modulator which administers multidimensional many-valued mode irregularity to the aforementioned plural divergence lights,
As for the aforementioned multidimensional many-valued mode modulator, having plural many-valued modulators and mode combination wave vessel,
The aforementioned many-valued modulator modulates the amplitude and phase of each degeneracy orthogonal polarized light mode of higher mode of the front numeration mode fiber on the basis of the information of the aforementioned transmission, concerning the aforementioned conveying light,
The component of the plural degeneracy orthogonal polarized light modes which are modulated with the aforementioned each many-valued modulator the combination wave it does the aforementioned mode combination wave vessel,
Correspondence it does to attach to each coordinate which becomes settled with parameter of the particular multidimensional irregularity space at the time of mode modulating of the transmitter, information of many-valued transmission, vis-a-vis the amplitude of degeneracy orthogonal polarized light mode of higher mode of the front numeration mode fiber and the multidimensional irregularity space which designates phase as parameter, that the transmission with multidimensional many-valued mode irregularity is done it features, the transmitter.
[claim6]
6. As for the aforementioned many-valued modulator, X side amplitude modulator, and modulate the phase of x polarized light component X side phase modulator and the Y side amplitude modulator which modulates the amplitude of the y polarized light component, and modulates the phase of the y polarized light component the Y side phase modulator which modulate the amplitude of x polarized light component concerning x polarized light component and the y polarized light component of degeneracy orthogonal polarized light mode, and,
x polarized wave which modulates x polarized light component and the y polarized wave which modulates the y polarized light component it features that it has polarized light [bimusupuritsuta] which the polarized wave combination wave is done, in claim 5 the transmitter of statement.
[claim7]
7. Several mode fibers are designated as the transmission line, higher mode of the front numeration mode fiber is used for the irregularity space and in the receiver which information of transmission is received,
With multidimensional many-valued mode recovery, having the multidimensional many-valued mode demodulator which amplitude and phase difference of the aforementioned degeneracy orthogonal polarized light mode recovers and outputs the information of transmission,
As for the aforementioned multidimensional many-valued mode demodulator,
Mixing with the signal light and local oscillation light of the radiation edge of the aforementioned transmission line, forming interference light, the aforementioned multidimensional many-valued mode the mixer which outputs the interference light which corresponds to each coordinate of the multidimensional irregularity space which is modulated and,
The polarized wave separating the aforementioned interference light, the polarized wave separator which separates x polarized light component and the y polarized light component of the orthogonal polarized light component and,
The photodetector which detects the interference light which is separated into each polarized light component and,
-description above light detector with detection do interchange component addition to depend, description above cross polarized light component from each degeneracy cross polarized light mode amplitude and phase difference obtain operation vessel have,
Correspondence it does to attach to each coordinate which becomes settled with parameter of the particular multidimensional irregularity space at the time of mode recovering of the receiver, information of many-valued transmission, vis-a-vis the amplitude of degeneracy orthogonal polarized light mode of higher mode of the front numeration mode fiber and the multidimensional irregularity space which designates phase as parameter, that the transmission with multidimensional many-valued mode irregularity is done it features, the receiver.
[claim8]
8. As for the aforementioned mixer, the local oscillator and the translucent mirror which give out local oscillation light having,
Incidence point to the signal light of the radiation edge of the aforementioned transmission line to the incident edge of one side of the aforementioned translucent mirror, incidence point to the local oscillation light which the aforementioned local oscillator gives out to the other incident edge of the aforementioned translucent mirror, from the radiation edge mixing with signal light and local oscillation light, the interference light which can radiation is done,
As for the aforementioned photodetector, it has with the Y side 4 quadrant divided photodetectors which incidence it can point coming out light firing of the y polarized light component which X side 4 quadrant divided photodetectors and the aforementioned polarized wave separator which incidence it can point coming out light firing of x polarized light component which the aforementioned polarized wave separator separates separate, X side 4 quadrant divided photodetectors and the Y side 4 quadrant divided photodetectors output the output signal which respectively differs phase from four each quadrants,
The aforementioned computing element inputs four output signals of X side 4 quadrant divided photodetectors, the addition and subtraction does each output signal and inputs four output signals of amplitude of x polarized light component, and X polarized light component computing element and the Y side 4 quadrant divided photodetectors which calculate phase the addition and subtraction does each output signal and features that amplitude of the y polarized light component and the Y polarized light component computing element which calculates phase are had, in claim 7 the receiver of statement.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • YOKOHAMA NATIONAL UNIVERSITY
  • 発明者(英語)
  • KOKUBUN YASUO
  • WATANABE TATSUHIKO
国際特許分類(IPC)
指定国 (WO201730137)
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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