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Formal Acceleration on FPGA. Innovation in Verification
Optical probing is becoming a critical manufacturing boundary for silicon photonics as the industry shifts from laboratory precision to high-volume repeatability, a transition essential for scaling co-packaged optics, optical I/O, and photonic integrated circuits in AI infrastructure. While controlled environments can achieve extremely accurate fiber-to-coupler alignment—measuring insertion loss, coupling efficiency, modulation response, and detector sensitivity—manufacturing demands that the same optical result be reproducible across thousands of devices, wafers, operators, tools, calibration cycles, and production lots. A successful single measurement demonstrates capability; a repeatable measurement across many units creates the evidence needed for yield analysis and product release. Photonics probing differs fundamentally from electrical wafer probing because optical coupling performance changes with minute variations in position, height, angle, polarization, wavelength, and temperature. When optical and electrical behavior must be measured together—for modulators requiring optical input/output, high-speed RF drive, DC bias, polarization management, and thermal stabilization—the test system itself becomes part of the evidence chain. Modern photonics probe platforms from companies such as FormFactor integrate controlled stages, electrical probes, optical fibers or arrays, imaging systems, motion systems for automated alignment, and calibration routines. The goal is not just to find the highest optical power once, but to turn alignment into a controlled, automated process that captures alignment position, optical input power, polarization state, temperature, calibration status, and repeated-measurement variation. Accuracy and repeatability are not the same. Manufacturing requires answers to whether another tool or operator can reproduce the measurement, and whether the system can distinguish device variation from test-system variation. Automation converts expert manual alignment into repeatable sequences—locating the device, searching for optical power, optimizing position, verifying electrical contact, applying calibration, and storing evidence with each device record. For co-packaged optics and optical I/O, photonics probing sits at the boundary between device design and manufacturing, ensuring that optical performance can be reproduced after assembly, across temperature, and through process variation.