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DTSTAMP:20260525T211344Z
DESCRIPTION:Abstract\n\nThe increasing demand for computational performance
  and speed in data-intensive applications has driven the exploration of ne
 w computing paradigms that leverage photonic technologies for analog and d
 igital operations. This thesis presents several key research contributions
  toward the realization of a microring-based system for optical analog and
  digital computing. First\, it introduces the theoretical foundations of s
 ilicon photonics\, optical neural networks\, and optical digital computing
 . Building on this background\, a self-referenced thermal feedback stabili
 zation circuit is proposed and experimentally validated. The circuit maint
 ains microring operation at a stable point where the through and drop port
  average powers are equal\, ensuring self-calibration and immunity to temp
 erature and fabrication variations over a wavelength range of 5.88 nm. The
  thesis then explores the use of this stabilization technique for optical 
 analog computing by implementing a microring-based weight function for neu
 romorphic photonic systems. The system demonstrates state-of-the-art preci
 sion of 11.3 bits and accuracy of 9.3 bits for 2 Gbps optical payload sign
 als and shows potential to maintain reliable operation across temperature 
 fluctuations up to 60 °C.\n\nIn the context of digital computing\, a micro
 ring-modulator optical logic gate (OLG) was designed\, fabricated\, and fu
 lly characterized. Its measured power transfer characteristic (PTC) exhibi
 ts a peak optical gain of approximately −171 W/W \, far exceeding the slop
 e of −1 W/W threshold generally accepted for reliable signal regeneration.
  The proposed logic gate offers a reasonable noise margin of 12.5 % when d
 riven with -6 dBm (250 μW ) continuous-wave laser enabling robust cascadab
 le OLG-based systems. The designed logic gate delivers a 64 μWpp different
 ial output swing while remaining functional with inputs as low as 8 μWpp\,
  translating into a practical fan-out of four to eight subsequent gates. A
  2 × 2 optical switch assembled from seven interoperating OLGs validated s
 ystem-level scalability: toggling the differential select line between 46 
 μW (logic 0) and 78 μW (logic 1) correctly routed 250 μW input signals int
 o the desired bar or cross outputs without logic errors.\n\nThe optical co
 mputing device stabilizer presented in this thesis further advance the sil
 icon-on-insulator platform toward scalable and manufacturable solutions. W
 hile CMOS-compatible silicon photonics has long been viewed as a promising
  path\, its adoption has been limited by scalability and integration chall
 enges. By enabling robust analog and digital computing with microrings\, t
 his work supports a unified approach to computation and communication usin
 g fully integrated silicon photonics.\n
DTSTART:20251209T160000Z
DTEND:20251209T180000Z
LOCATION:Room 603\, McConnell Engineering Building\, CA\, QC\, Montreal\, H
 3A 0E9\, 3480 rue University
SUMMARY:PhD defence of Jose Garcia-Echeverria – Stabilized Optical Microrin
 gs for Analog and Digital Computing
URL:/ece/channels/event/phd-defence-jose-garcia-echeve
 rria-stabilized-optical-microrings-analog-and-digital-computing-369524
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