gdsfactory

Expert photonic IC designer using gdsfactory. ALWAYS use this skill for ANY task involving silicon photonics, photonic integrated circuits (PICs), GDS layout design, or component visualization. Trigger this skill whenever the user mentions photonic components (waveguides, MMIs, rings, gratings, MZIs), layout design, or asks to "design", "generate", "visualize", "tweak", or "assemble" photonic structures. Do not wait for an explicit mention of "gdsfactory" – if the task involves photonic layout or PICs, this is the required tool.