Coherent Mixer Phase Error Compensation

The patent applies asymmetry by intentionally introducing asymmetric semiconductor regions (first and second external semiconductor regions) with specific side surface orientations that are not parallel to the waveguide side surfaces. This asymmetric structure compensates for manufacturing errors by creating a geometric configuration that actively counteracts phase shifts and imbalance shifts, thereby improving manufacturing precision without simply increasing symmetry.

The patent addresses manufacturing precision by adding structural elements in additional spatial dimensions. The external semiconductor regions extend beyond the conventional waveguide boundaries, creating a multi-dimensional structure where the side surfaces are oriented at specific angles relative to the waveguide. This dimensional expansion provides extra degrees of freedom for compensating manufacturing errors and maintaining desired phase differences.

The patent applies local quality by adding semiconductor regions with specific properties only in localized areas where height differences and imbalances occur. The first and second external semiconductor regions are positioned at specific locations relative to the waveguide, with their side surfaces oriented to locally compensate for height variations. This targeted approach improves reliability by addressing specific problem areas rather than uniformly increasing device complexity throughout the entire structure.

The patent uses the counterweight principle by introducing external semiconductor regions that act as compensatory elements. These regions are positioned and oriented to counterbalance the height differences and imbalances created by the waveguide structure. The asymmetric orientation of their side surfaces creates a counteracting geometric effect that offsets manufacturing errors, thereby improving output imbalance without requiring complete structural redesign.