(1) Brought up a home-grown and fully automated opto-electronic wafer probing system capable of optically and electrically probing 300mm silicon photonics wafers. This included a wafer chuck system, 6-axis stages for fiber alignment, and automated stages for electrical probing.
(2) Developed test automation frameworks in Python for fully automated wafer test, which included instrument and stage drivers, file IOs, test and analysis methods, probe touchdown counters, etc.
(3) Developed the active probing methodology for our prober, including a detailed study of contact resistance, probe overdrive, and repeatability.
(4) Developed automated testing procedures for passive photonics devices (MMIs, directional couplers, waveguide loss cutbacks, group index structures, crossings etc.) and active opto-electronic devices (thermal phase shifters, PN phase shifters, variable-optical attenuators, and photodetectors).
(5) Performed repeatability tests of grating coupler alignment and contact resistance in our wafer probing system.
(6) Responsible for the company’s wafer-acceptance test (WAT).
(7) Worked on a team efficiently with other testers and designers for test priorities, test recipes, and post-analysis of testing data, coded collaboratively using Git.
Multiple research projects regarding the design, fabrication, and characterization of integrated photonic devices, including add-drop filters, integrated Bragg gratings, nanobeam cavities, polarization beam splitters and arrayed-waveguide gratings.
(1) Designed a three-stigmatic-point arrayed waveguide grating based on an aberration theory, which improved the resolving power of edge channels and addressed the non-flat focal plane issue in traditional Rowland structures.
(2) Designed and experimentally demonstrated two different polarization beam splitters: one based on apodized Bragg gratings for a high polarization extinction ratio (> 30 dB), the other based on asymmetric directional couplers for a large optical bandwidth (> 100 nm).
(3) Collaborated with another research group on the design, simulation, and fabrication of a high-quality-factor nanobeam cavity, verified the cubic relationship between the quality factor and the waveguide length of this cavity.
(4) Observed and analyzed the unexpected loss occurred on the high-frequency side of the stopband of integrated Bragg gratings, demonstrated that the transmission drop pattern is affected by cladding dimensions.
(5) Collaborated with a colleague on the design and implementation of a novel add-drop filter with arbitrarily spaced channels, based on a complex Bragg grating realized by a Layer Peeling/Adding algorithm.
