Title page for etd-0620116-231528


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URN etd-0620116-231528
Author Szu-chin Lei
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Precision Mechanical Grinding Integrated with Spin-on-Glass Electrostatic Pulling Method for Producing Micro-hyperboloid Lensed Optical Fibers
Date of Defense 2016-07-13
Page Count 93
Keyword
  • coupling efficiency
  • radius of curvature
  • microlensed
  • spin-on-glass
  • single-mode fiber
  • electrostatic pulling
  • Abstract A novel approach is presented for producing hyperboloid microlens structure directly on an optical single-mode fiber for enhancing the coupling efficiency between high-power laser diodes and single-mode fiber. The hyperboloid lens structure was directly produced with a flat-end single-mode fiber with the core diameter of 6.6 μm. The production has three-step process, including a precision mechanical grinding, a spin-on-glass coating and an electrostatic pulling process. After a single-mode fiber was grinded into hyperboloid shape, trace amount of spin-on-glass is attached to the grinded fiber tip and then an electrostatic pulling is used to adjust the radius of curvature of around 4-5 μm for the single-mode fiber endface. The hyperboloid microlens structure is manufactured for matching with the rectangular outlet of the semiconductor laser diode. A high average coupling efficiency around 81% is obtained, and highest reaches 86.42% for 20 produced lensed fibers. While using the produced hyperboloid fibers, which is doubled efficiency compared to the flat end fiber. The approach was saving time with a simple way of making a microlens structure, so that we testing the micorlenses stability to confirm the feasibility. The coupling stability in five minutes for 5 individual hyperboloid fibers not more than 0.17%, express the good stability for the produced hyperboloid microlensed fibers. Unlike previous with melting or other processes to forming a microlens structure, this method does not damage the fiber endface and can be re-produced. So that, the developed method provides a solution for producing hyperboloid microlensed fibers for high performance coupling between the single mode fiber and the semiconductor diode laser.
    Advisory Committee
  • Wood-Hi Cheng - chair
  • Chin-Ping Yu - co-chair
  • Ying-Chien Tsai - co-chair
  • Yi-Cheng Hsu - co-chair
  • Che-Hsin Lin - advisor
  • Files
  • etd-0620116-231528.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2016-07-20

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