Title page for etd-0712116-155045


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URN etd-0712116-155045
Author Chong-jia Wu
Author's Email Address No Public.
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Department Electro-Optical Engineering
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Narrowband silicon photonics grating devices
and its application
Date of Defense 2016-07-22
Page Count 97
Keyword
  • waveguide
  • Bragg grating
  • integrated optical device
  • optical spectrum
  • Abstract This thesis aims to achieve functional grating devices on silicon-on-insulator (SOI) platform using the cladding-modulated (CladMod) waveguide configuration. Such a CMOS-compatible CladMod grating is able to provide narrowband reflection and stable Bragg wavelength from a high-index-contrast SOI platform. The proposed CladMod grating serves as a building block in this work to realize various functional photonic devices on SOI, including (1) coarse wavelength-division-multiplexing 20-nm-spaced four-channel gratings by adjusting the core waveguide width for effective index engineering, (2) multi-channel grating reflectors by introducing width corrugations on the sidewalls of CladMod core and cladding waveguides, (3) bandwidth-tunable gratings by varying the misalignment between sidewall gratings to tune the grating coupling strength, and (4) multi-channel grating reflectors by applying sampled gratings on either a straight CladMod waveguide or a micro-ring resonator for different free-spectral-range needs. We also investigate the effects of asymmetric distance between core and cladding waveguides in CladMod gratings.
    A silicon photonics temperature sensor based on CladMod gratings on SOI substrate is finally demonstrated. This sensor enables a narrowband reflection (0.63 nm for 30 nm grating width), a linear wavelength-to-temperature response over a wide temperature range with an extinction ratio of 21 dB, a stable reflection bandwidth (Δλ/ΔWg = 0.013), Bragg wavelength (λB/ΔWg = 0.002), and temperature sensitivity (δλ/δT/ΔWg = -1.3×10-5 K-1 with a δλ/δT = 83.4 pm/oC) against the grating width variation, and a FOM score of 0.132/oC. Such a superior temperature sensing properties in CladMod gratings outperform the strip- and slab-type grating counterparts.
    Advisory Committee
  • San-Liang Lee - chair
  • Tsung-Hsien Lin - co-chair
  • Wei Lin - co-chair
  • Chia-chien Wei - co-chair
  • Yung-Jr Hung - advisor
  • Files
  • etd-0712116-155045.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2016-08-12

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