Optical signal comprising a succession of multi-band bursts of multi-carrier data signals, system and method of emission of such a signal, and corresponding optical transport network

Method for sending data in an optical network comprising a plurality of optical nodes, characterized in that it comprises:

• at least two steps for generating, in two independent spectral bands, a multi-carrier optical data signal obtained by modulating a source signal at a source wavelength;
• at least two steps for sending said multi-carrier optical data signal in the form of single-band data bursts that can be associated with distinct source wavelengths, a single-band data burst corresponding to a time sub-division of said multi-carrier optical data signal and occupying a time slot;
• a step for combining said single-band data bursts into multi-band data bursts occupying a spectral band corresponding to a juxtaposition of said independent spectral bands, and a time slot corresponding to the time slot of said single-band data bursts;
• a step for controlling an instant of sending said single-band data bursts, implementing a control plane taking account of a path time of said single-band data bursts between said sending steps and said combination step and configured to synchronize said single-band data bursts at an entrance of said combination step.

Optical network comprising:

• a plurality of source nodes,
• a source node configured to generate, in a spectral band associated with it, a multi-carrier optical data signal obtained by modulation of a source signal at a source wavelength and to send said multi-carrier optical data signal in the form of single-band data bursts that can be associated with distinct source wavelengths, a single-band data burst corresponding to a time sub-division of said multi-carrier optical data signal and occupying a time slot,
• at least one module for combining said single-band data bursts, sent by certain of said source nodes in said spectral bands that are associated with them, into multi-band data bursts, occupying a spectral band corresponding to a juxtaposition of said spectral bands associated with the source nodes, and a time slot corresponding to the time slot of said single-band data bursts,
• a control unit for controlling an instant of sending of said single-band data bursts by said source nodes, implementing a control plane taking account of a path time of said single-band data bursts sent by said source nodes to said at least one module for combining, said control unit being configured to have the single-band data bursts reach said module for combining synchronously;
• at least one core node (7) for the passive routing of said multi-band data bursts, configured to direct said multi-band data bursts as a function of said associated source wavelengths;
• at least one band separator module, configured to separate said multi-band data bursts into a plurality of single-band data bursts and to direct said single-band data bursts as a function of their associated source wavelength towards a destination node to which said source wavelength is dedicated;
• a plurality of destination nodes (2-1, 2-2, 2-3, 2-4, 2-5) of said single-band data bursts.