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1. WO2009004668 - WAVELENGTH DIVISION MULTIPLEXING SYSTEM AND METHOD FOR DETECTING INPUT DISCONNECTION OF OPTICAL SIGNAL

Publication Number WO/2009/004668
Publication Date 08.01.2009
International Application No. PCT/JP2007/000723
International Filing Date 02.07.2007
IPC
H04J 14/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
14Optical multiplex systems
H04B 10/07 2013.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
H04B 10/077 2013.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
075using an in-service signal
077using a supervisory or additional signal
H04B 10/25 2013.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
25Arrangements specific to fibre transmission
H04B 10/2507 2013.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
25Arrangements specific to fibre transmission
2507for the reduction or elimination of distortion or dispersion
H04J 14/02 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
14Optical multiplex systems
02Wavelength-division multiplex systems
CPC
H04B 10/07955
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
075using an in-service signal
079using measurements of the data signal
0795Performance monitoring; Measurement of transmission parameters
07955Monitoring or measuring power
H04B 10/25133
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
25Arrangements specific to fibre transmission
2507for the reduction or elimination of distortion or dispersion
2513due to chromatic dispersion
25133including a lumped electrical or optical dispersion compensator
H04J 14/0221
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
14Optical multiplex systems
02Wavelength-division multiplex systems
0221Power control, e.g. to keep the total optical power constant
Applicants
  • 富士通株式会社 FUJITSU LIMITED [JP]/[JP] (AllExceptUS)
  • 國松和宏 KUNIMATSU, Kazuhiro [JP]/[JP] (UsOnly)
  • 小野威 ONO, Takeshi [JP]/[JP] (UsOnly)
Inventors
  • 國松和宏 KUNIMATSU, Kazuhiro
  • 小野威 ONO, Takeshi
Agents
  • 大菅義之 OSUGA, Yoshiyuki
Priority Data
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) WAVELENGTH DIVISION MULTIPLEXING SYSTEM AND METHOD FOR DETECTING INPUT DISCONNECTION OF OPTICAL SIGNAL
(FR) SYSTÈME DE MULTIPLEXAGE PAR RÉPARTITION EN LONGUEUR D'ONDE ET PROCÉDÉ SERVANT À DÉTECTER UNE DÉCONNEXION D'ENTRÉE D'UN SIGNAL OPTIQUE
(JA) 波長分割多重装置及び光信号の入力断の検出方法
Abstract
(EN)
A method which is capable of accurately detecting input disconnection of an optical signal even when the ASE light level is of great magnitude. A photodetector converts an optical signal into an electrical signal, while a low-pass filter allows passing of a low frequency signal. A clock data recovery circuit outputs a signal indicating whether or not the low frequency signal has been able to be detected from the output signal of a low-pass filter (44) to a control section (46). The control section controls a variable dispersion compensator to perform the variable dispersion compensating operation when the low frequency signal has been able to be detected in the clock data recovery circuit. When the low frequency signal has been unable to be detected in the clock data recovery circuit, the control section makes a judgment of input disconnection of the optical signal to stop the variable dispersion compensating operation of the variable dispersion compensator.
(FR)
Un procédé qui est capable de détecter précisément une déconnexion d'entrée d'un signal optique même lorsque le niveau de lumière ASE est d'une grande ampleur. Un photodétecteur convertit un signal optique en un signal électrique, tandis qu'un filtre passe-bas permet de passer d'un signal de fréquence basse. Un circuit de récupération des données d'horloge fournit un signal indiquant si le signal de fréquence basse a pu être détecté à partir du signal de sortie d'un filtre passe-bas (44) à une section de commande (46). La section de commande commande un compensateur de dispersion variable pour réaliser l'opération de compensation de dispersion variable lorsque le signal de fréquence basse a pu être détecté dans le circuit de récupération des données d'horloge. Lorsque le signal de fréquence basse n'a pas pu être détecté dans le circuit de récupération des données d'horloge, la section de commande effectue un jugement d'une déconnexion d'entrée du signal optique pour arrêter l'opération de compensation de dispersion variable du compensateur de dispersion variable.
(JA)
 本発明の課題は、ASE光のレベルが大きい場合にも光信号の入力断を正確に検出できるようにすることである。光検出器は光信号を電気信号に変換し、ローパスフィルタは、低周波の信号を通過させる。クロックデータリカバリ回路は、ローパスフィルタ44の出力信号から低周波の信号を検出できたか否かを示す信号を制御部46に出力する。制御部は、クロックデータリカバリ回路において、低周波の信号が検出できたときには、可変分散補償器に分散補償動作を行わせる。クロックデータリカバリ回路において、低周波の信号が検出できないかったときには、光信号の入力断と判断して可変分散補償器の分散補償動作を停止させる。
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