| 摘要 |
An optical telecommunications network ( 1000 ), of metropolitan area type, having a ring type core ( 10 ), and secondary rings ( 41, 42; 43, 44 ). In each sending access node ( 11 ), transmitters ( 111 ) for sending information-carrying optical signals use a wavelength belonging to a group of wavelengths dedicated to the secondary ring ( 41, 42 ) to which this sending access node ( 11 ) is connected. In each destination access node ( 21 ), receivers ( 212 ) are capable of receiving all the wavelengths used by sending nodes ( 11 ) of the network. Communication nodes ( 1, 2 ) comprise all-optical devices ( 100, 101, 10; 201, 20 ) for inserting, into the core fiber ( 10 ), optical signals sent by a sending access node connected to the communication nodes. Optical couplers ( 31, 32 ), for taking from the core fiber ( 10 ) a so-called representative signal formed of a fraction of the power of each information-carrying signal, are respectively coupled to the receivers of the destination nodes.
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