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UID:20260924T080008EDT-0222Lmla0L@132.216.98.100
DTSTAMP:20260924T120008Z
DESCRIPTION:Abstract\n\nThe demand for high-speed data transmission is esca
 lating with the rapid expansion of services like cloud computing\, video s
 treaming\, and big data analytics. Traditional electrical interconnects\, 
 limited by bandwidth and power consumption bottlenecks\, are giving way to
  optical communications. Integrated photonic devices\, offering significan
 t advantages in performance and efficiency\, have become critical in addre
 ssing these demands. Key to enhancing optical link capacity are multiplexi
 ng techniques such as polarization division multiplexing (PDM)\, wavelengt
 h division multiplexing (WDM)\, and mode division multiplexing (MDM)\, whi
 ch necessitate the development of components capable of handling diverse i
 nputs. Additionally\, maximizing single-channel transmission capacity in i
 ntensity modulation direct detection (IMDD) systems is another vital strat
 egy for capacity enhancement.\n\nThis thesis investigates integrated devic
 es and circuits for optical interconnects. The first section develops broa
 dband silicon photonic polarization-insensitive switches essential for PDM
  transmission. Initial designs employ square-cross-section waveguides that
  ensure the same thermal optic coefficients (TOCs) for two polarizations\,
  achieving polarization-dependent losses of less than 2 dB across the C-ba
 nd. Further innovations introduce polarization-mode diversity conversion a
 nd mode-insensitive phase shifters\, enhancing extinction ratios to over 1
 5 dB across a 100-nm wavelength range while maintaining low insertion loss
 es.\n\nSubsequent research introduces an integrated polarization controlle
 r capable of converting any state of polarization (SOP) into the fundament
 al transverse electric (TE) mode for on-chip modulators\, supported by a t
 heoretical analysis of various control algorithms\, including Particle Swa
 rm Optimization (PSO)\, Genetic Algorithm (GA)\, and Gradient Descent (GD)
 .\n\nThe third section presents a colorless\, power-efficient silicon phot
 onic switch for WDM\, employing ultra-broadband couplers and subwavelength
  gratings for broadband operation\, and mode-looped phase shifters for dou
 bling the device's power efficiency. This switch demonstrates extinction r
 atios above 10 dB across a wavelength range from 1350 nm to 1675 nm\, with
  a minimal power consumption of 11.1 mW.\n\nThe final section demonstrates
  high-speed transmission using advanced BTO-assisted silicon photonic modu
 lators and InP external modulated lasers (EMLs). A net 300 Gbps/λ transmis
 sion is achieved by using the BTO modulator. Furthermore\, transmissions u
 sing InP EML exceed 200 Gbps over 80 km in the O-band\, highlighting the p
 otential of EMLs for metropolitan networks.\n\nOverall\, this research not
  only advances multiplexing technologies but also enhances single-channel 
 capacities\, emphasizing the essential role of integrated photonic devices
  in expanding modern optical networks to meet global data demands.\n
DTSTART:20240805T160000Z
DTEND:20240805T180000Z
LOCATION:Room 603\, McConnell Engineering Building\, CA\, QC\, Montreal\, H
 3A 0E9\, 3480 rue University
SUMMARY:PhD defence of Weijia Li – Advancing Integrated Photonic Designs fo
 r High-speed Datacenter Interconnects
URL:https://www.mcgill.ca/ece/channels/event/phd-defence-weijia-li-advancin
 g-integrated-photonic-designs-high-speed-datacenter-interconnects-358160
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