Optical add-drop device

An optical add-drop device comprising:

• an input port;
• a through port;
• a drop port;
• an add port;
• a first optical circuit;
• and
• a second optical circuit,
• wherein each of the first optical circuit and the second optical circuit includes
• a first sub optical circuit,
• a second sub optical circuit, and
• a third sub optical circuit,
• wherein each of the first sub optical circuit, the second sub optical circuit and the third sub optical circuit includes
• an input coupler,
• an output coupler, and
• a phase shifter, implemented between the input coupler and the output coupler, configured to provide a controllable amount of phase shift,
• the input port is optically coupled to the input coupler in the first sub optical circuit in the first optical circuit,
• the through port is optically coupled to the output coupler in the third sub optical circuit in the first optical circuit,
• the drop port is optically coupled to the output coupler in the second sub optical circuit in the second optical circuit,
• the add port is optically coupled to a first port of the input coupler in the third sub optical circuit in the second optical circuit,
• in each of the first optical circuit and the second optical circuit,
• a first port of the output coupler in the first sub optical circuit is optically coupled to the input coupler in the second sub optical circuit,
• a second port of the output coupler in the first sub optical circuit is optically coupled to a second port of the input coupler in the third sub optical circuit,
• the output coupler in the second sub optical circuit in the first optical circuit is optically coupled to the input coupler in the first sub optical circuit in the second optical circuit, and
• the output coupler in the third sub optical circuit in the second optical circuit is optically coupled to a first port of the input coupler in the third sub optical circuit in the first optical circuit.

An information processing device, comprising:

• a calculator;
• and
• an optical add-drop device connected to the calculator, the optical add-drop device including
• an input port,
• a through port,
• a drop port,
• an add port,
• a first optical circuit, and
• a second optical circuit,
• wherein each of the first optical circuit and the second optical circuit includes
• a first sub optical circuit,
• a second sub optical circuit, and
• a third sub optical circuit,
• wherein each of the first sub optical circuit, the second sub optical circuit and the third sub optical circuit includes
• an input coupler,
• an output coupler, and
• a phase shifter implemented between the input coupler and the output coupler, an amount of a phase shift of the phase shifter being controllable,
• the input port is optically coupled to the input coupler in the first sub optical circuit in the first optical circuit,
• the through port is optically coupled to the output coupler in the third sub optical circuit in the first optical circuit,
• the drop port is optically coupled to the output coupler in the second sub optical circuit in the second optical circuit,
• the add port is optically coupled to a first port of the input coupler in the third sub optical circuit in the second optical circuit,
• in each of the first optical circuit and the second optical circuit,
• a first port of the output coupler in the first sub optical circuit is optically coupled to the input coupler in the second sub optical circuit, and
• a second port of the output coupler in the first sub optical circuit is optically coupled to a second port of the input coupler in the third sub optical circuit,
• the output coupler in the second sub optical circuit in the first optical circuit is optically coupled to the input coupler in the first sub optical circuit in the second optical circuit, and
• the output coupler in the third sub optical circuit in the second optical circuit is optically coupled to an input port of the input coupler in the third sub optical circuit in the first optical circuit, and
• the optical add-drop device drops an optical signal of a specified wavelength from a WDM signal entering via the input port and guides the dropped optical signal to the calculator via the drop port, and adds an optical signal entering from the calculator via the add port to the WDM signal and outputs the resultant signal via the through port.