Method and device for determining a presence of a locking signal in a signal received by an optical receiver device

A method for determining a presence of a locking signal in a signal received by an optical receiver device, the optical receiver device configured to be used in an optical communications network, the locking signal being a signal exchanged by optical communication devices of the optical communications network in a phase preceding setting up communications between the optical communication devices, wherein the optical receiver device performs:

• obtaining, from the received signal, a direct current component or a component at twice a frequency at which the locking signal is supposed to be modulated;
• determining a presence in the received signal of a communication signal resulting from a communication between optical communication devices of the optical communications network;
• and, when the presence of the communication signal is detected in the received signal:
• determining a contribution of the communication signal on the direct current component or respectively on the component at twice a frequency at which the locking signal is supposed to be modulated;
• and
• determining whether the locking signal is present in the received signal by subtracting at least, from the direct current component or respectively from the component at twice a frequency at which the locking signal is supposed to be modulated, the determined contribution of the communication signal.

A device for determining a presence of a locking signal in a signal received by the device, the device configured to be used in an optical communications network, the locking signal being a signal exchanged by optical communication devices of the optical communications network in a phase preceding setting up communications between the optical communication devices, wherein the device is configured to perform:

• obtaining, from the received signal, a direct current component or a component at twice a frequency at which the locking signal is supposed to be modulated;
• and
• determining a presence in the received signal of a communication signal resulting from a communication between optical communication devices of the optical communications network;
• and, when the presence of the communication signal is detected in the received signal, the device is further configured to perform:
• determining a contribution of the communication signal on the direct current component or respectively on the component at twice a frequency at which the locking signal is supposed to be modulated;
• and
• determining whether the locking signal is present in the received signal by subtracting, from the direct current component or respectively from the component at twice a frequency at which the locking signal is supposed to be modulated, the determined contribution of the communication signal.