Optical Node and Optical Transceiver for Auto Tuning of Operational Wavelength

An optical node configured to multiplex optical signals, the optical node comprising:

• an add port;
• a common port;
• an auxiliary port;
• an optical transfer module;
• and
• a reflecting element coupled to the auxiliary port, wherein:
• the optical transfer module is configured to couple a signal received on the add port to:
• the common port, when a wavelength of the signal received on the add port matches an operational wavelength of the optical node, and
• the auxiliary port, when the wavelength of the signal received on the add port does not match an operational wavelength of the optical node;
• and
• the reflecting element is configured to reflect a signal received on the auxiliary port to the add port.

An optical node configured to multiplex optical signals, the optical node comprising:

• an add port;
• a common port;
• an auxiliary port;
• an optical transfer module;
• and
• a monitoring element configured to monitor optical signal power of an optical signal received on the auxiliary port, wherein
• the optical transfer module is configured to couple a signal received on the add port to:
• the common port, when a wavelength of the signal received on the add port matches an operational wavelength of the optical node, and
• the auxiliary port, when the wavelength of the signal received on the add port does not match an operational wavelength of the optical node.

A method performed by a controller of an optical transceiver, wherein the optical transceiver comprises a tunable laser configured to generate an optical signal, a port configured to transmit the generated optical signal and to receive an optical signal, and a received signal monitoring element configured to monitor optical signal power of an optical signal received on the port, wherein the method comprises:

• causing the tunable laser to scan over wavelengths from a candidate set of transmission wavelengths;
• monitoring optical signal power received on the transmission port;
• identifying a transmission wavelength at which a power transition of the monitored optical signal power takes place;
• selecting an operational wavelength as a function of the identified transmission wavelength;
• and
• causing the tunable laser to generate an optical signal at the selected operational wavelength.

A method performed by a controller of an optical transceiver, wherein the optical transceiver comprises a tunable laser configured to generate an optical signal and a port configured to transmit the generated optical signal and to receive an optical signal, wherein the method comprises:

• causing the tunable laser to scan over wavelengths from a candidate set of transmission wavelengths;
• receiving a control signal communicating an operational wavelength for the transceiver;
• and
• causing the tunable laser to generate an optical signal at the selected operational wavelength.