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Photonic interposers are promising to advance energy-efficient clock tree distribution and high-bandwidth communication among chiplets. However, optimizing photonic interposer performance is challenging, since design tools for photonic integrated circuits (ICs) must account for all the following: (i) Optical timing skew among chiplets with arbitrary physical locations; (ii) Optical loss skew due to propagation and device loss; (iii) Routing/placement blockages for electronic-photonic systems; (iv) Detailed electronic-photonic circuit simulations to verify performance; (v) Physical verification (Design Rule Check, Layout Vs. Schematic) of photonic ICs; and (vi) Seamless integration with Electronic Design Automation (EDA) tools to facilitate electronic-photonic co-design. To address this challenge, we present: (1) Photonic-to-Electronic and Electronic-to-Photonic Integrated Circuit Transformations – we transform photonic ICs so they can be automatically designed and optimized using industry-standard EDA tools for electronic ICs (e.g., mapping optical propagation delays and losses into electrical RC wire delay within 5% accuracy, and transforming electrical IC layouts to photonic IC layouts). This enables us to leverage mature EDA tools to address all the above considerations simultaneously. To show the scalability of our approach, we automatically design a 128 × 128 electro-optical router in under 40 minutes. (2) Photonic interposer designs for Optical Clock Tree (OCT) distribution (we show example clock trees with up to 32 sinks) – compared to standalone design tools for OCT Synthesis, our approach improves optical timing skew by 13.85%. (3) Experimental demonstration of a photonic interposer, fabricated in Thin Film Lithium Niobate (TFLN), a promising material platform to realize high-bandwidth and low-loss photonic ICs – we experimentally measure optical loss skew of 2.16 dB among six OCT sinks on our photonic interposer. We also describe techniques to further reduce optical loss skew through electrical modulation of optical power.