Integrated photonics assemblies

A system comprising:

• a first assembly comprising a first integrated photonics assembly having a first functionality, the first assembly comprising:
• a plurality of subcircuits comprising a plurality of modular photonic integrated subcircuits, wherein:
• each subcircuit is pre-fabricated and is configured to transfer light to and receive light from another subcircuit based on the first functionality;
• an output port of a first subset of the plurality of subcircuits is configured to be aligned with an input port of a second subset of the plurality of subcircuits;
• for the first subset of the plurality of subcircuits, the output port is configured at a particular position along a first edge of the first subset, and for the second subset of the plurality of subcircuits, the input port is configured at a particular position along a second edge of the second subset;
• and
• at least one subcircuit is configured to be removed from the first integrated photonics assembly and connected to a second integrated photonics assembly having a second functionality, the first integrated photonics assembly different from the second integrated photonics assembly and the first functionality different from the second functionality.

A system comprising:

• a first assembly comprising a first integrated photonics assembly having a first functionality, the first assembly comprising:
• a plurality of subcircuits comprising a plurality of modular photonic integrated subcircuits, wherein:
• each subcircuit is pre-fabricated and is configured to transfer light to and receive light from another subcircuit based on the first functionality;
• an output port of a first subset of the plurality of subcircuits is configured to be aligned with an input port of a second subset of the plurality of subcircuits;
• at least two subcircuits are configured to transfer and receive light via butt-coupling;
• and
• at least one subcircuit is configured to be removed from the first integrated photonics assembly and connected to a second integrated photonics assembly having a second functionality, the first integrated photonics assembly different from the second integrated photonics assembly and the first functionality different from the second functionality.

A system comprising:

• a first assembly comprising a first integrated photonics assembly having a first functionality, the first assembly comprising:
• a plurality of subcircuits comprising a plurality of modular photonic integrated subcircuits, wherein:
• each subcircuit is pre-fabricated and is configured to transfer light to and receive light from another subcircuit based on the first functionality;
• an output port of a first subset of the plurality of subcircuits is configured to be aligned with an input port of a second subset of the plurality of subcircuits;
• and
• at least one subcircuit is configured to be removed from the first integrated photonics assembly and connected to a second integrated photonics assembly having a second functionality, the first integrated photonics assembly different from the second integrated photonics assembly and the first functionality different from the second functionality;
• and
• a plurality of monitoring circuits, wherein:
• each monitoring circuit is coupled to a respective one of a subset of the plurality of subcircuits;
• each monitoring circuit comprises a first light path between an input and an output of the subcircuit;
• and
• each monitoring circuit is configured to monitor optical loss in the first light path.