Photon architecture for bi-directional and co-directional links

A photonic circuit comprising:

• a first coupling waveguide and a second coupling waveguide;
• a first receiver arm comprising a first signal detection component, the first receiver arm in optical communication with the first coupling waveguide and the second coupling waveguide via a first pair of receiver filters, wherein the first receiver arm corresponds to a first wavelength;
• a second receiver arm comprising a second signal detection component, the second receiver arm in optical communication with the first coupling waveguide and the second coupling waveguide via a second pair of receiver filters, wherein the second receiver arm corresponds to a second wavelength;
• a first transmitter arm comprising a first signal generator configured to generate optical signals of the first wavelength, the first transmitter arm in optical communication with at least one of the first coupling waveguide or the second coupling waveguide;
• and
• a second transmitter arm comprising a second signal generator configured to generate optical signals of the second wavelength, the second transmitter arm in optical communication with at least one of the first coupling waveguide or the second coupling waveguide,
• wherein:
• the photonic circuit is configured for selective use in a bi-directional link or a co-directional link,
• the first wavelength is different from the second wavelength,
• optical filters of the first pair of receiver filters and the second pair of receiver filters are respective bandpass filters,
• when at least one receiver filter of the first pair of receiver filters is tuned to pass the first wavelength, the photonic circuit is configured to receive optical signals of the first wavelength,
• when the first pair of receiver filters is tuned to not pass the first wavelength, the photonic circuit is configured to transmit optical signals of the first wavelength,
• when at least one receiver filter of the second pair of receiver filters is tuned to pass the second wavelength, the photonic circuit is configured to receive optical signals of the second wavelength, and
• when the second pair of receiver filters is tuned to not pass the second wavelength, the photonic circuit is configured to transmit optical signals of the second wavelength.

A method comprising:

• at least one of receiving or transmitting respective signals of two or more wavelengths via a photonic circuit, wherein the photonic circuit comprises:
• two or more wavelength branches, each wavelength branch of the two or more wavelength branches corresponding to a respective wavelength of the two or more wavelengths, each wavelength branch of the two or more wavelength branches comprising:
• a receiver arm comprising a signal detection component configured to receive a respective signal of the respective wavelength;
• and
• a transmitter arm comprising a signal generator configured to provide a respective signal of the respective wavelength.