High bandwidth RF or microwave interconnects for optical modulators

An interconnect, comprising:

• an interposer to route a signal from a signal feed to a substrate interface, via an interposer interface, of an optical modulator,
• the interposer interface being aligned with the substrate interface in a vertical direction only,
• the interposer being positioned along a surface of a substrate of the optical modulator, and
• the interposer including a trace,
• the trace being connected to the signal feed at a height different than a height of the surface of the substrate of the optical modulator, the trace being connected to the substrate interface, and the interposer including a cavity and another interposer,
• the other interposer being positioned in the cavity of the interposer such that the trace is to be routed through or on the other interposer.

An electrical interconnect, comprising:

• an interposer positioned along a substrate surface of an optical substrate,
• the interposer including a trace associated with routing an electrical signal to an active region of the optical substrate via an interposer interface,
• the interposer interface being aligned with the active region in a vertical direction only,
• the interposer including a cavity that is oriented such that one or more sides of the cavity are substantially orthogonal to one or more sides of the interposer,
• the trace being commenced on the interposer in a plane that is at a different height than a plane corresponding to the substrate surface, and
• the trace connecting to a substrate interface of the optical substrate proximal to the active region.