Modular Opto-Electronic Assembly with Self-Aligning Waveguides

The patent implements preliminary alignment by pre-forming waveguide chips with precise waveguide paths and coupling facets before final assembly. The bumpers are pre-positioned on the substrate to establish alignment references, and fiber blocks are pre-coupled to waveguide chips. This preliminary preparation eliminates the need for time-consuming active alignment during final PIC-to-fiber coupling, as the alignment geometry is already established in advance through precise fabrication of alignment features.

The patent introduces waveguide chips as intermediary components between fiber blocks and PICs. These waveguide chips serve as alignment mediators that transfer the alignment reference from the fiber block (via bumpers) to the PIC. The intermediary waveguide chip with its precisely formed waveguides and coupling facets enables passive alignment by providing a stable geometric reference, eliminating the need for expensive active alignment equipment while maintaining high coupling precision.

The waveguide chip acts as an intermediary that enables passive alignment to achieve high precision. The waveguide chip is fabricated with precise waveguide paths and coupling facets that serve as geometric alignment references. By coupling the fiber block to the waveguide chip and the waveguide chip to the PIC through these pre-formed geometric features, the system achieves high coupling precision using simple passive alignment techniques without requiring expensive active alignment equipment.

The patent replaces the mechanical active alignment system (requiring expensive equipment and manual adjustment) with a geometric alignment system based on precisely fabricated bumpers and coupling facets. The alignment is achieved through mechanical interlocking of these geometric features rather than through active optical feedback and adjustment, thereby reducing manufacturing cost while maintaining precision through superior fabrication accuracy of the alignment features.

The waveguide chip serves as an intermediary that eliminates the need for complex active alignment equipment. By providing pre-formed waveguide paths and coupling facets with precise geometric relationships, the waveguide chip transfers alignment references through simple geometric interlocking. This intermediary structure replaces the need for complex active alignment systems with simple passive geometric alignment, thereby reducing device complexity while maintaining high coupling precision.

The alignment features (bumpers and coupling facets) are designed to self-align the components during assembly. The geometric shapes and positions of these features automatically establish the correct alignment when components are brought together, without requiring external active alignment equipment or manual adjustment. This self-aligning mechanism eliminates complex alignment equipment while achieving high precision through the self-service capability of the geometric features.

The patent merges the alignment reference function with the mechanical support structure by integrating bumpers into the substrate and waveguide chip designs. The bumpers serve dual purposes: providing mechanical support/positioning and establishing alignment references simultaneously. This merging eliminates the need for separate alignment structures that would occupy additional space, thereby achieving high coupling precision without increasing the overall assembly footprint.

The alignment features (bumpers and coupling facets) are designed to perform multiple functions: mechanical positioning, alignment reference, and structural support. This multi-functionality eliminates the need for dedicated alignment structures that would consume additional space. The same geometric features that provide mechanical support also establish the alignment geometry, thereby achieving high precision coupling within a compact assembly footprint.