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Optimized alignment algorithms for Photonic Integrated Circuit (PIC) wafer-level testing significantly boost throughput. Fixed Gradient offers the best reliability, while Variable Gradient provides the fastest alignment for silicon photonics manufacturing.

Area of Science:

  • Photonics and semiconductor manufacturing
  • Optical metrology and alignment
  • Advanced algorithm development

Background:

  • Wafer-level testing of Photonic Integrated Circuits (PICs) is a major bottleneck in silicon photonics production.
  • Co-packaged optics increase the demand for testing thousands of optical I/O per wafer.
  • Existing alignment methods lack the speed and accuracy required for high-volume manufacturing.

Purpose of the Study:

  • To optimize and evaluate alignment algorithms for the Technoprobe Eclipse Dynamic probe card system.
  • To assess algorithm performance under various operating conditions, including high-speed and low-speed operation with and without hysteresis compensation.
  • To identify the most reliable and efficient alignment strategy for high-volume PIC manufacturing.

Main Methods:

Keywords:
Bayesian optimizationPhotonic Integrated Circuitshysteresis compensationoptical alignmentpiezoelectric actuationprobe cardwafer-level testing

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  • Systematic evaluation of seven alignment algorithms: Reference Coarse Scan, Reference Coarse+Fine Scan, Cross Scan, Local and Global Bayesian Optimization, Variable and Fixed Gradient Ascent.
  • Testing across 72 simulated cases derived from eight experimental datasets using spatial windowing.
  • Experimental validation on eight die positions under four operating regimes (HS/LS, H/NH).

Main Results:

  • Experimental validation showed 100% success for Local Bayesian and Fixed Gradient baseline algorithms.
  • Simulations revealed Fixed Gradient as the most reliable (95.8%) with high accuracy (99.4%) across conditions.
  • Variable Gradient offered the fastest alignment (1.18 a.u.) but with lower reliability (90.3%).
  • Fixed Gradient proved optimal for high-speed, hysteresis-compensated scenarios (95.8% reliability, 1.44 a.u. alignment time).

Conclusions:

  • Optimized alignment algorithms, particularly Fixed Gradient, significantly improve throughput and reliability in PIC wafer-level testing.
  • The Technoprobe Eclipse Dynamic system enables sub-second optical alignments for high-volume manufacturing.
  • Algorithm selection depends on the trade-off between speed and reliability for specific production scenarios.