Method and device for determining whether a configuration of an optical transmission interface has to be adjusted

16:

• A method for determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting an optical signal to a second device via an optical band-pass filter, the second device including an optical reception interface configured to enable receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when said carrier wavelength is comprised in the passband of the optical band-pass filter, wherein, the carrier wavelength and/or the passband of the band-pass filter being a priori unknown, the method comprising a monitoring device performing:
• obtaining information representative of a signal temporal shape corresponding to a symbol of an optical signal received by the second device, from the first device, via the optical band-pass filter;
• and
• determining whether the configuration of the optical transmission interface of the first device has to be adjusted regarding the carrier wavelength, on the basis of said information representative of the signal temporal shape.

17:

• The method according to claim 16, wherein the second device performs:
• obtaining measurements of the signal strength of the optical signal, received by the second device, from the first device via the optical band-pass filter, at plural instants in a duration of the symbol;
• and
• transmitting to the monitoring device information representative of said measurements.

18:

• The method according to claim 16, wherein the second device performs:
• obtaining measurements of signal strength of the optical signal, received by the second device, from the first device via the optical band-pass filter, at plural instants in a duration of the symbol;
• determining local extremes or inflection points in the measurements of the signal strength;
• and
• transmitting to the monitoring device information representative of said local extremes or inflection points.

23:

• The method according to claim 16, wherein the monitoring device performs:
• detecting that no information has been received during a predetermined time period from the second device for enabling obtaining the information representative of the signal temporal shape;
• and
• requesting the first device to transmit to the second device at least one specific symbol via the optical band-pass filter.

25:

• The method according to claim 24, wherein the monitoring device performs beforehand:
• obtaining an information indicating whether an energy level of the optical signal received by the second device over an integration period increased, decreased, or was stable when comparing said energy level and an energy level of the optical signal received by the second device over a preceding integration period;
• and
• configuring the optical transmission interface of the first device, on the basis of said information.

26:

• The method according to claim 24, wherein the monitoring device performs beforehand:
• obtaining measurements of energy level of the optical signal received by the second device over an integration period, for plural carrier frequencies;
• and
• configuring the optical transmission interface of the first device, on the basis of said measurements.

27:

• A device for determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting an optical signal to a second device via an optical band-pass filter, the second device including an optical reception interface configured to enable receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when said carrier wavelength is comprised in the passband of the optical band-pass filter, wherein, the carrier wavelength and/or the passband of the band-pass filter being a priori unknown, the device comprising:
• means for obtaining information representative of a signal temporal shape corresponding to a symbol of an optical signal received by the second device, from the first device, via the optical band-pass filter;
• and
• means for determining whether the configuration of the optical transmission interface of the first device has to be adjusted regarding the carrier wavelength, on the basis of said information representative of the signal temporal shape.