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UID:20260610T155803EDT-6383Di7fzd@132.216.98.100
DTSTAMP:20260610T195803Z
DESCRIPTION:Abstract\n\nThe mid-infrared (MIR) wavelength range of the elec
 tromagnetic spectrum (2-20 µm) coincides with the fundamental vibrational 
 frequencies of a vast majority of molecules\, hence is crucially important
  for chemical sensing and molecular spectroscopy. The development of effic
 ient MIR technologies requires optical fiber components. Currently\, comme
 rcially available optical fiber components are mostly made of silica with 
 a functionality limited to the transmission window of silica fiber (up to 
 2 µm)\, and thus\, not suitable for the MIR applications. Chalcogenide and
  fluoride fibers\, on the other hand\, possess much wider transmission win
 dows\, up to 6 μm for ZBLAN and 20 µm for chalcogenide fiber\, and have pr
 ovided the possibility of MIR optical fiber components realization.\n\nThi
 s dissertation presents several optical fiber components designed and fabr
 icated using chalcogenide and ZBLAN fibers. The first single-mode broadban
 d and wavelength division multiplexing (WDM) chalcogenide optical fiber co
 uplers (OFCs)\, as well as polarization beam-splitters\, are demonstrated.
  The OFCs functionality is engineered with a careful design of their geome
 try resulting in any arbitrary coupling ratio from 99:1 to 50:50. Also\, t
 he first all-chalcogenide ring fiber laser is presented. The compact devic
 e is made from the combination of an As2Se3 OFC for the insertion of pump 
 light and extraction of laser light\, as well as an As2S3 nonlinear gain f
 iber to ensure laser oscillation. In addition\, nonlinear chalcogenide OFC
 s with a power-dependent coupling coefficient are designed and demonstrate
 d. These nonlinear OFCs enable all-optical switching and will be useful fo
 r passive mode-locking. Finally\, single-mode ZBLAN OFCs are demonstrated.
  The OFCs are fabricated using a multiple-sweep tapering technique that al
 lows precise and repeatable control of the OFCs’ geometry\, which results 
 in OFCs’ single-modedness and reproducibility while limiting crystallizati
 on. This is an important step towards the extension of optical fiber techn
 ologies in the MIR.\n
DTSTART:20220718T160000Z
DTEND:20220718T180000Z
LOCATION:Room 603\, McConnell Engineering Building\, CA\, QC\, Montreal\, H
 3A 0E9\, 3480 rue University
SUMMARY:PhD defence of Mohsen Rezaei - Chalcogenide and ZBLAN Optical Fiber
  Components
URL:https://www.mcgill.ca/ece/channels/event/phd-defence-mohsen-rezaei-chal
 cogenide-and-zblan-optical-fiber-components-340350
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