Control plane for an optical network for transmitting multi-carrier data bursts with dynamic adaptation of learning sequence

An optical source node (Nd_S) of an optical network comprising a plurality of source nodes and destination nodes, the optical source node comprising:

• a module for generating a multi-carrier optical data signal obtained by modulation of a source signal at a source wavelength and a module for sending the 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 comprising, in addition to payload data symbols (PL), a sequence of learning symbols (TS) comprising a plurality of learning symbols;
• and
• a reception module for receiving command signals comprising a piece of information indicative of an instant of sending of the single-band data bursts and a piece of information indicative of a source wavelength to be used for sending the single-band data bursts;
• wherein the command signals (GRANT) also comprise a piece of information (Nb_TS) on a size of the sequence of learning symbols (TS) of the single-band data bursts;
• and
• wherein the generation module is configured to adapt the size of the sequence of learning symbols of the single-band data bursts as a function of the information received.

An optical destination node (Nd_D) of an optical network comprising a plurality of source nodes and destination nodes, the optical destination node comprising:

• a first reception module for reception of optical bursts of a multi-carrier data signal obtained by modulation of a source signal at a source wavelength;
• and
• a burst of data comprising, in addition to payload data (PL) symbols, a sequence of learning symbols (TS) comprising a plurality of learning symbols,
• wherein the first reception module comprises a channel equalizer configured to compile channel equalization coefficients from the sequence of learning symbols,
• wherein the optical destination node also comprises a second reception module for receiving command signals comprising a piece of information (Nb_TS) on the size of the sequence of learning symbols (TS) of the data bursts;
• and
• wherein the channel equalizer takes account of the piece of information on the size of the sequence of learning symbols for computing equalization coefficients.

A method of sending data in an optical network comprising a plurality of source nodes and destination nodes, the method comprising:

• generating a multi-carrier optical data signal obtained by modulation of a source signal at a source wavelength and sending the multi-carrier optical data signal in the form of single-band data bursts that can be associated with distinct source wavelengths, wherein a single-band data burst comprises, in addition to a plurality of payload data symbols (PL), a sequence of learning symbols (TS) comprising a plurality of learning symbols;
• and
• receiving command signals comprising a piece of information indicative of an instant of sending of the single-band data bursts, a piece of information indicative of a source wavelength to be used for the sending of the single-band data bursts, and a piece of information indicative of the size of the sequence of learning symbols of the single-band data bursts,
• wherein the generating comprises processing a size of the sequence of learning symbols of the single-band data bursts as a function of the information received.

A method of reception of data in an optical method comprising a plurality of source nodes and destination nodes, the method comprising:

• receiving optical bursts of a multi-carrier data signal obtained by modulation of a source signal at a source wavelength, a burst comprising, in addition to payload data symbols (PL), a sequence of learning symbols (TS) comprising a plurality of learning symbols;
• and
• implementing a channel equalization comprising processing channel equalization coefficients from the sequence of learning symbols;
• and
• receiving command signals comprising a piece of information indicative of a size of the sequence of learning symbols of the data bursts,
• wherein the channel equalization takes into account the information on the size of the sequence of learning symbols for the computation of the equalization coefficients.