Optical flow switching using photonic integrated circuits

An optical flow switch, comprising:

• a network of photonic switches arranged between input and output ports of the optical flow switch, wherein:
• the network of photonic switches spans two or more reticles, wherein the two or more reticles comprise a same reticle pattern, and the network of photonic switches is formed of a repeating arrangement of the same reticle pattern,
• the network of photonic switches comprises a first plurality of switches arranged to form Benes switches and a second plurality of switches comprising input routing switches coupled between the input ports and the Benes switches, and
• the second plurality of switches comprise:
• first input routing switches arranged to receive optical signals from the input ports;
• second input routing switches arranged to receive optical signals from the first routing switches;
• and
• third input routing switches arranged to receive optical signals from the second routing switches and to transmit optical signals to the Benes switches.