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UID:20260522T001001EDT-34319ZrNrw@132.216.98.100
DTSTAMP:20260522T041001Z
DESCRIPTION:Abstract\n\nThe ever-increasing throughput of global networks h
 as been driving the evolution of optical communication in the past decades
 . Optical transceivers are the key component in optical communication to t
 ransmit and receive data through optical fiber. Silicon photonics leverage
 s its compatibility with the mature process of complementary metal-oxide-s
 emiconductor (CMOS) fabrication to enable low-cost and high-yield mass pro
 duction\, making it a promising platform for optical transceivers.\n\nIn t
 his thesis\, we cover the design and characterization of advanced silicon 
 photonic devices and circuits for optical interconnects. The thesis can be
  separated to two parts. In the first part\, we demonstrate three designs 
 of passive optical devices that utilize subwavelength gratings (SWG) to im
 prove the devices in various aspects. In the first design\, by inserting a
  SWG slot in the middle of a multimode interference (MMI) coupler to achie
 ve 1310/1550 nm multiplexing\, we managed to reduce the length of the devi
 ce to 37 μm while achieving calculated 1-dB-IL bandwidths of 192 nm and 12
 3 nm at the two target bands. The second design is a broadband all-silicon
  multi-band transverse-magnetic-pass (TM-pass) polarizer where we carefull
 y utilize different regimes of Bragg gratings for both TE and TM modes. Th
 e device achieves 343-nm bandwidth with IL < 0.4 dB and polarization extin
 ction ratio (PER) > 20 dB in simulation. In the third design\, a broadband
  silicon photonic waveguide crossing enabled by SWG lateral cladding is pr
 oposed. The device achieves a calculated maximum IL of 0.229 dB and a maxi
 mum crosstalk of -35.6 dB over a 415-nm wavelength range from 1260 nm to 1
 675 nm\, which covers the whole band for optical communication. All three 
 designs are tested experimentally and the results are shown to well match 
 the simulation.\n\nIn the second part\, we introduce two works about the c
 o-design of silicon photonic circuits and optical communication systems. T
 he first work is the development of two low-complexity digital signal proc
 essing (DSP) algorithms to improve the performance of the optical digital 
 subcarrier multiplexing (DSCM) transmission system on a silicon photonic t
 ransmitter. In the experiment with 64 GBd 4-bit/s/Hz DSCM signal containin
 g 8 subcarriers through 43.2 km of standard single-mode fiber (SSMF)\, the
  two algorithms combined bring a power budget increase of 4.159 dB at the 
 HD-FEC threshold. For the second work\, we propose a novel silicon photoni
 c receiver with phase-retrieving capability based on the spectrally effici
 ent silicon asymmetric self-coherent detection (ASCD). In 40-km transmissi
 on experiments\, a record net electrical spectral efficiency (ESE) of 7.10
  bit/s/Hz per wavelength and per polarization is achieved\, where a net 20
 8-Gb/s 32QAM transmission is demonstrated using 29.3-GHz electrical bandwi
 dth.\n
DTSTART:20240724T150000Z
DTEND:20240724T170000Z
LOCATION:Room 267\, Macdonald Engineering Building\, CA\, QC\, Montreal\, H
 3A 0C3\, 817 rue Sherbrooke Ouest
SUMMARY:PhD defence of Jinsong Zhang – Advanced Integrated Silicon Photonic
  Devices and Circuits for Optical Interconnects
URL:/ece/channels/event/phd-defence-jinsong-zhang-adva
 nced-integrated-silicon-photonic-devices-and-circuits-optical-357992
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