Hybrid Integration of III–V Lasers on Silicon Photonic Chips: A Performance Analysis

Silicon photonics offers dense integration, low cost, and CMOS compatibility, but lacks efficient native light sources. Hybrid integration of III–V gain media with silicon waveguides bridges this gap and has matured into several manufacturable approaches (e.g., adhesive and direct bonding, micro-transfer printing, and flip-chip attachment). This paper analyzes deviceand link-level performance of hybrid III–V/ Si lasers cointegrated with passive/active silicon photonic components. We present a compact modeling flow based on laser rate equations, coupling-loss budgeting, thermal impedance estimates, and system-level noise accumulation to predict wallplug efficiency, output power, linewidth, relative intensity noise (RIN), and bit-error rate (BER) in representative datacom and coherent applications. Using realistic parameters, we quantify the sensitivity of side-mode suppression ratio (SMSR), threshold current, and optical coupling efficiency to taper geometry and bonding interface loss. A case study on a 400Gb/s CWDM4/ DR4-style link illustrates how bonding loss and junction self-heating translate into OSNR and TDECQ penalties. The analysis provides practical guidelines for designing robust hybrid laser assemblies on silicon, highlighting trade-offs among efficiency, footprint, thermal design, and reliability.

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