Telecom Italia S.p.a.

Telecom Italia Lab S.p.a.

Marco Schiano

Renato Caponi

Luca Palmieri

Andrea Allasia

Andrea Galtarossa

Tiziana Tambosso

Diego Roccato

Luigi Varetto

Laura Serra

Marcello Potenza

Delivering multicast data traffic over a communication network includes a first network node delivering multicast data traffic to second network nodes. The first and second network nodes are connected by a transmission network in a ring architecture and implement a point-to-multipoint layer 2 protocol. A method includes at the first network node: collecting alarms signals indicative of a failure along the whole ring and of the second network nodes. Based on a current state of the alarm signals, delivering the multicast data traffic either in a first delivery direction along the ring, or in a second delivery direction along the ring opposite to the first delivery direction, or in both the first and second delivery directions. At each of the second network nodes: collecting alarm signals indicative of a failure of the transmission network locally to the second network node and of the second network node. Based on a current state of the local alarm signals either receiving the multicast data traffic delivered by the first network node from the first direction, forwarding the multicast data traffic in the first direction and transmitting local data traffic to the first network node along the second delivery direction, or receiving the data traffic delivered by the first network node from the second direction, forwarding the multicast data traffic in the second direction and transmitting the local data traffic to the first network node along the first delivery direction.

Protecting an ethernet network having a ring architecture

The present invention relates to a new model for interpreting interferometric measurements, able to lead to a new method, system () and device () for measuring the PMD (Polarisation Mode Dispersion) of an optical fibre (). The model, which is based on the theory of propagation of the optical signal as can be determined according to the socalled Prindpal States of Polarisation (PSPs) of the fibre, leads to a new interpretation of the interferogram generated with the interferometric measurements and is characterized in that it identifies in said interferogram a central peak and two side lobes. Thanks to this new model, it is possible to determine the PMD of the fibre based on the information content associated to at least one of the two side lobes identified in the interferogram.

Method and apparatus for measuring the polarization mode dispersion of an optical fiber

An apparatus and method for characterizing or measuring chromatic dispersion in an optical fiber segment. The fiber is accessed at one end with a signal generator injecting modulating pulsed signals which are reflected at the other end of the fiber, the apparatus determining the phase difference between the modulation signals and the reflected modulation signals and calculating the chromatic dispersion therefrom.

Apparatus and method for measuring chromatic dispersion by variable wavelength

The process and apparatus to enable measurement of polarization dispersion of a single-mode optical fibre by launching measurement light at one end of the fibre and analyzing polarization of the light reflected by the other end and collected at such launch end. Optical or electronic masking of light reflected by the near end of the fibre is performed during launch.

Process and apparatus for measuring polarization dispersion in optical fibers

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Turin, Italy

Marco Schiano