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All-Embracing Multiphysics Analysis for Chiplet-Based Systems

26 d ago

Co-packaged optics, silicon photonics, optical I/O, and photonic engines are central to AI infrastructure, driven by copper's limitations and light's efficiency. However, the real challenge is not just the photonic device but the full electro-optical realization path—from electrical launch and ASIC interface through EIC, PIC, modulator, coupling, fiber attach, package substrate, thermal management, alignment, signal integrity, and testing to yield, reliability, and lifecycle evidence. This complete path is termed the **Electro-Optical Realization Corridor (EORC)**, within which the **Electro-Optical Realization Block (EORB)** integrates multiple materials and interfaces. AI infrastructure requires manufacturable, testable, package-integrated, thermally stable, and reliable systems, not isolated device success. Silicon photonics is a materials-integrated stack where each component—TIM, underfill, adhesives, substrate—affects final behavior. UV adhesives impact alignment and aging; underfills influence stress and warpage; TIMs alter thermal gradients and wavelength stability. The shift is from device performance to multi-material realization, critical as optical engines move closer to ASICs and packages. Co-packaged optics (CPO) is not just optics but a packaging problem: optical paths must survive real package conditions, maintain electrical integrity, stable fiber attach, and thermal reliability. Light solves distance, but realization determines scale. A device can be impressive but fail as a scalable product because margins from thermal drift, stress, routing, or adhesive shift interact across domains. Materials are now central evidence, not passive inputs. Each choice—TIM, underfill, substrate, fiber attach—must be evaluated within the integrated electro-optical system. The corridor approach treats cross-domain convergence as essential for trusted optical interconnects at system scale.