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1. (WO2014199601) EQUALIZER, POLARIZATION SEPARATOR USING SAME, AND EQUALIZATION METHOD
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2014/199601 International Application No.: PCT/JP2014/002991
Publication Date: 18.12.2014 International Filing Date: 05.06.2014
IPC:
H04L 27/01 (2006.01) ,H03H 17/00 (2006.01) ,H04B 3/04 (2006.01) ,H04B 10/2507 (2013.01) ,H04B 10/61 (2013.01) ,H04J 14/00 (2006.01) ,H04J 14/04 (2006.01) ,H04J 14/06 (2006.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27
Modulated-carrier systems
01
Equalisers
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
H
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
17
Networks using digital techniques
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
3
Line transmission systems
02
Details
04
Control of transmission; Equalising
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
10
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
25
Arrangements specific to fibre transmission
2507
for the reduction or elimination of distortion or dispersion
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
10
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
60
Receivers
61
Coherent receivers
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
J
MULTIPLEX COMMUNICATION
14
Optical multiplex systems
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
J
MULTIPLEX COMMUNICATION
14
Optical multiplex systems
04
Mode multiplex systems
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
J
MULTIPLEX COMMUNICATION
14
Optical multiplex systems
06
Polarisation multiplex systems
Applicants:
日本電気株式会社 NEC CORPORATION [JP/JP]; 東京都港区芝五丁目7番1号 7-1,Shiba 5-chome, Minato-ku, Tokyo 1088001, JP
Inventors:
小笠原 大作 OGASAHARA, Daisaku; JP
Agent:
下坂 直樹 SHIMOSAKA, Naoki; 東京都港区芝五丁目7番1号日本電気株式会社内 c/o NEC CORPORATION, 7-1,Shiba 5-chome, Minato-ku, Tokyo 1088001, JP
Priority Data:
2013-12551314.06.2013JP
Title (EN) EQUALIZER, POLARIZATION SEPARATOR USING SAME, AND EQUALIZATION METHOD
(FR) ÉGALISEUR, SÉPARATEUR DE POLARISATION L'UTILISANT, ET PROCÉDÉ D'ÉGALISATION
(JA) 等化器、それを用いた偏光分離器、および等化方法
Abstract:
(EN) When using a polarization separator which updates filter coefficients by CMA, since distortion of the constellation of a reproduced received optical signal increases if the optical SNR of the received optical signal is low, this polarization separator comprises a filter means which inputs a first received signal and a second received signal acquired from a polarization division multiplexed signal beam, and a filter coefficient updating means which updates the filter coefficients such that the envelope of the output signal of the filter means is constant, wherein the filter coefficient updating means calculates an output symbol distance, calculates the output symbol movement amount, which is the difference between a first output symbol distance, calculated from the output signal acquired using the first filter coefficient, and a second output symbol distance, calculated from the output signal acquired using the second filter coefficient that updates the first filter coefficient, and calculates an update amount of the filter coefficient such that the change in the output symbol movement amount relative to the first output symbol distance is point-symmetric around a prescribed target value of the first output symbol distance.
(FR) Lors de l'utilisation d'un séparateur de polarisation qui met à jour des coefficients de filtre par CMA, étant donné qu'une distorsion de la constellation d'un signal optique reçu et reproduit augmente si le rapport signal-bruit optique du signal optique reçu est faible, ce séparateur de polarisation comprend: un filtre qui introduit un premier signal reçu et un second signal reçu acquis d'un faisceau de signal multiplexé par répartition en polarisation; et un moyen de mise à jour de coefficients du filtre qui met à jour les coefficients du filtre de sorte que l'enveloppe du signal de sortie du filtre soit constante. Le moyen de mise à jour de coefficients du filtre calcule une distance de symbole de sortie, calcule la valeur de mouvement du symbole de sortie, qui est la différence entre une première distance de symbole de sortie, calculée à partir du signal de sortie acquis au moyen du premier coefficient de filtre, et une seconde distance de symbole de sortie, calculée à partir du signal de sortie acquis au moyen du second coefficient de filtre qui met à jour le premier coefficient de filtre, et calcule une valeur de mise à jour du coefficient de filtre de sorte que le changement de la valeur de mouvement de symbole de sortie par rapport à la première distance de symbole de sortie soit un point de symétrie autour d'une valeur cible prescrite de la première distance de symbole de sortie.
(JA)  CMAによってフィルタ係数を更新する偏光分離器を用いると、受信光信号の光SN比が低い場合、再生した受信光信号のコンスタレーションの歪が大きくなるため、本発明の偏光分離器は、偏光多重信号光から取得した第1の受信信号と第2の受信信号を入力するフィルタ手段と、フィルタ手段の出力信号の包絡線が一定となるようにフィルタ係数を更新するフィルタ係数更新手段を有し、フィルタ係数更新手段は、出力シンボル距離を算出し、第1のフィルタ係数を用いて取得した出力信号から算出した第1の出力シンボル距離と、第1のフィルタ係数を更新した第2のフィルタ係数を用いて取得した出力信号から算出した第2の出力シンボル距離との差である出力シンボル移動量を算出し、第1の出力シンボル距離に対する出力シンボル移動量の変化が、第1の出力シンボル距離の所定の目標値を中心として点対称となるようにフィルタ係数の更新量を算出する。
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Designated 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, LT, 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
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (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)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)