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Topology Optimized Integrated SiN Mode Converters

https://doi.org/10.1109/IPC57732.2023.10360633

Probst, Michael J.; Hammond, Alec M.; Ralph, Stephen E. (November 2023, IEEE)

We present compact, low-loss silicon nitride mode converters designed using topology optimization and fabricated on a commercial silicon foundry. We experimentally demonstrate efficient mode conversion (-0.32 dB for TE00 to TE01 and -0.52 dB for TE00 to TE02), both within 0.4 dB of simulation.
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Phase-Injected Topology Optimization for Scalable and Interferometrically Robust Photonic Integrated Circuits

https://doi.org/10.1021/acsphotonics.2c01016

Hammond, Alec M.; Slaby, Joel B.; Probst, Michael J.; Ralph, Stephen E. (November 2022, ACS Photonics)

We present a novel device-design methodology that produces interferometrically robust photonic integrated circuits on commercial foundry platforms. This new approach, which we call phaseinjected topology optimization, leverages reciprocity to both reduce the computational load and condition the corresponding optimization problem and is compatible with existing adjoint-based design frameworks. We experimentally validate our methodology by designing, fabricating, and testing a 90◦ optical hybrid that operates over C-band and occupies just 8 μm × 8 μm. We measured our device across three different wafers, and observe < ±7◦ of random variability, and a net -10◦ systematic phase deviation between simulation and experiment across all four output arms.
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Inverse-designed, normal incidence grating couplers for multi-core fiber I/O

https://doi.org/10.1109/IPC53466.2022.9975574

Probst, Michael J.; Hammond, Alec M.; Slaby, Joel B.; Ralph, Stephen E. (November 2022, IEEE IPC conference)

Abstract—We experimentally demonstrate normal-incidence grating couplers designed using topology optimization to couple into multi-core fiber. The insertion loss of the polarizing and polarization demultiplexing gratings was –5.5 dB and –7.7 dB, which is within 0.8 dB of the performance obtained using a fiber array
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