Telefonaktiebolaget Lm Ericsson (Publ)

Ericsson Ab

Riccardo Ceccatelli

Roberto Magri

Stefano Orsi

Paolo Debenedetti

Stefano Ruffini

Antonella Bogoni

Gianmarco Bruno

Alberto Deho

Claudio D'Incà

Annamaria Fulignoli

Enrico Dutti

Edoardo Mongiardini

Stefano Parodi

Emanuele Della Valle

Francesco Cisamolo

Marco Bajano

A multi-domain telecommunication network may use a blockchain with an activation block to activate a reserved connection path for a service. The network may use a correction block in the blockchain to efficiently and timely perform a crank-back procedure. A management node of a domain of the network may act as an activation miner send activation messages to management nodes of other domains of the network, the management nodes may perform activation for their respective portions of the connection path reserved by the activation block. The management node acting as the activation miner may verify activation of reserved resources and, in case of failure, generate a correction Block to lock the failed resources and to release the resources affected by the crank-back process. Subsequent blockchain decisions and calculations may reflect the actual status of network resources.

Distributed service activation method via blockchain

A communications network remote node having a downstream optical circuit configured to receive downstream, DS, optical signals from an active main node and from a standby main node, the downstream optical circuit switchable between a working mode and a protection mode. Optical receivers are configured to receive the demultiplexed downstream optical signals and output encapsulated downstream client signals. Optical transmitters are configured to receive encapsulated upstream client signals and to transmit upstream, US, optical signals at upstream wavelengths carrying the encapsulated upstream client signals. An upstream optical circuit is configured to multiplex the upstream optical signals carrying the encapsulated upstream client signals and to send the upstream optical signals to both main nodes. Processing circuitry is configured to extract downstream client signals and alignment data from encapsulated downstream client signals and form encapsulated upstream client signals by encapsulating upstream client signals and alignment data.

Optical transport network protection architecture, nodes and method

An indicator system () for optical ports () of a passive optical communications equipment (). The indicator system comprises a plurality of photodetectors () configured to detect an optical signal on the optical ports and a plurality of () configured to indicate on which optical ports an optical signal is detected by the photodetector. The indicator system further comprises a power source () configured to provide power to the photodetectors () and indicators (). The power source is self-contained at the passive optical communications equipment. The power source () comprises a mechanical to electrical converter ().

Optical port identification

There is provided a security system for use at an enclosure containing one or more passive components of an optical communication link. The security system comprises a sensor configured to detect a physical breach of the enclosure, and an optical alert signal generator coupled to the optical communication link. The optical alert signal generator is self-powered, and configured to generate an optical alert signal and transmit the optical alert signal through the optical communication link when a physical breach of the enclosure is detected by the sensor. The optical alert signal is detectable at an entity external to the enclosure and connected to the optical communication link.

Security system

A method of power control of an optical signal transmitted by a first network element. The first network element comprising a laser and a bandpass filter operating on the optical signal produced by said laser, whereas the method comprises receiving () information indicative of a power level of the optical signal transmitted by the first network element; and tuning () the laser output wavelength in response to said received information.

Method and apparatus for optical power control

An optical device () for an optical network, comprising an optical input (), a passive optical component (), a memory device () for storing information relating to the passive optical component. The optical device further comprises an optical splitter () configured to power split off a portion of received optical signals to form split optical signals and to output the remaining optical power of received optical signals to the passive optical component and a photodetector () configured to receive the split optical signals and to generate a corresponding photodetector output signal. Further the optical device comprises an accumulator () configured to be charged by the photodetector output signal, a laser () configured to be powered by the accumulator and a controller () configured to, in response to a trigger from the photodetector, read said information from the memory device and to cause the laser to transmit an optical signal from an optical output (), the optical signal carrying a message based on said information read from the memory device.

Optical device and hub node for an optical network

A connection-oriented communications network comprises a plurality of interconnected nodes. A traffic path can be set up across the network. Path delay data is obtained for the traffic path by using control plane signalling messages (e.g. a Resource Reservation Protocol-Traffic Engineering, RSVP-TE signalling message) between nodes of the traffic path. The path delay data can be path delay asymmetry data indicative of an asymmetry in path delay between a forward transmission direction and a reverse transmission direction of the traffic path. Each intermediate node along the traffic path can form a signalling message for forwarding to the downstream node which includes one or more values of path delay incurred by that node, or an accumulated path delay value. The path delay can result from one or more of mapping delay, Forward Error Correction (FEC) coding and propagation delay.

Distributing path delay data in a connection-oriented communications network

A method of determining a power correction factor for an optical power of an optical channel of a wavelength division multiplexed communications network. The method comprises configuring an optical source of the communications network to generate an unmodulated optical carrier signal for the optical channel. The method further comprises determining the optical power of the unmodulated optical carrier signal (P). The method further comprises configuring the optical source to apply a test modulation pattern to the optical carrier signal, to generate a modulated optical carrier signal. The method further comprises determining the optical power of the modulated optical carrier signal (P). The method further comprises determining a power correction factor for the optical channel by determining the difference between the optical powers of the unmodulated optical carrier signal and the modulated optical carrier signal.

Setting optical power for an optical communications network channel

A method and apparatus for restoration of operating conditions of a WDM optical ring network comprising a plurality of amplifiers linked together in a ring after a break or fault has occurred in the network. The method comprises in response to repair of the break or other fault, increasing output power or/and pump power of an amplifier in the network such that the output power or/and pump power increases substantially in accordance with a ramp function.

Growing community of inventors

Genoa, Italy

Riccardo Ceccatelli