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1. WO2000041351 - MONITORING OF SIGNAL WAVELENGTHS IN OPTICAL FIBRE

Publication Number WO/2000/041351
Publication Date 13.07.2000
International Application No. PCT/FI1999/001087
International Filing Date 28.12.1999
Chapter 2 Demand Filed 10.07.2000
IPC
H04B 10/08 2006.01
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
02Details
08Equipment for monitoring, testing or fault measuring
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 10/07957
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
07957Monitoring or measuring wavelength
H04J 14/02
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
14Optical multiplex systems
02Wavelength-division multiplex systems
Applicants
  • NOKIA NETWORKS OY [FI/FI]; Keilalahdentie 4 FIN-02150 Espoo, FI (AllExceptUS)
  • SALOMAA, Ari [FI/FI]; FI (UsOnly)
Inventors
  • SALOMAA, Ari; FI
Agents
  • PATENT AGENCY COMPATENT LTD.; Pitkänsillanranta 3 B FIN-00530 Helsinki, FI
Priority Data
98284131.12.1998FI
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MONITORING OF SIGNAL WAVELENGTHS IN OPTICAL FIBRE
(FR) SURVEILLANCE DE LONGUEURS D'ONDE DE SIGNAUX DANS DES FIBRES OPTIQUES
Abstract
(EN)
Individual wavelengths ($g(l)1, $g(l)2, $g(l)3,.. $g(l)N) of a multicomponent light wave travelling in an optical fibre are monitored in such a way that e.g. a coupler (31) is used to separate aside from the power of the light wave a small part, which is conducted into a narrowband tuneable optical filter (32). The filter tuning signal is used for controlling the filter (32) in such a way that the wavelength window formed by its pass band will scan the entire wavelength range to be examined. The narrowband optical signal obtained from the filter is conducted to a light detector (33), which converts the optical signal into an electric signal. As the window of the tuneable filter scans through the wavelength band, such an electric signal is obtained as a wavelength function which is proportional to the power of the optical signal and the peak points of which are located at the wavelength of each channel. Based on the control signal and the peak points, the control electronics circuit (34) determines the individual wavelengths of the multicomponent light wave.
(FR)
Des longueurs d'onde individuelles ($g(l)1, $g(l)2, $g(l)3,.. $g(l)N) d'une onde lumineuse à composantes multiples se déplaçant dans une fibre optique sont surveillées de manière telle que par ex. un coupleur (31) est utilisé pour séparer une petite partie de la puissance de l'onde lumineuse, qui est conduite dans un filtre optique accordable (32) à bande étroite. Le signal d'accord du filtre est utilisé pour commander le filtre (32) de manière telle que la fenêtre de longueur d'onde formée par sa bande passante balaie la plage totale de longueurs d'onde à examiner. Le signal optique à bande étroite produit par le filtre est conduit dans un détecteur (33) de lumière qui convertit le signal optique en un signal électrique. Tandis que la fenêtre du filtre accordable balaie la bande de longueurs d'onde, un tel signal électrique est obtenu en tant qu'une fonction de longueur d'onde qui est proportionnelle à la puissance du signal optique et dont les points de crête sont situés à la longueur d'onde de chaque canal. Sur la base du signal de commande et des points de crête, le circuit électronique de commande (34) détermine les longueurs d'onde individuelles de l'onde lumineuse à composantes multiples.
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