Title page for etd-0711105-105919


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URN etd-0711105-105919
Author Kuo-liang Wang
Author's Email Address m923050004@student.nsysu.edu.tw
Statistics This thesis had been viewed 5343 times. Download 3856 times.
Department Electro-Optical Engineering
Year 2004
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Coupling between Ultra High-Power Laser Diodes and Fibers
Date of Defense 2005-06-20
Page Count 65
Keyword
  • ultra high-power laser
  • mode conversion
  • fiber grating
  • external cavity
  • Abstract The width of an ultra high-power laser diode is greater than 50 μm and more than 20 times of low-power laser diode.The core diameter of Erbium Doped Fiber Amplifier fiber (EDFA) is 4~6 μm and it is a single-mode fiber (SMF).However,the ultra high-power laser diode is multi-mode laser. Therefore,the mismatch between high-power laser and SMF resulting in low coupling efficiency.
       We improve coupling efficiency by using a wedge-shaped graded-index fiber (GIF) tip spliced to a SMF then fused a fiber bragg  grating (FBG) to form an external cavity laser. The GIF is a focusing action like a graded-index fiber. From near-field pattern (NFP),we find the best GIF length is 400 μm. The coupling efficiency between ultra high-power laser diode and wedge-shape lensed fiber is only 5% .
    Advisory Committee
  • Sheng-lung Huang - chair
  • Hung-wen Chang - co-chair
  • Tsong-sheng Lay - co-chair
  • Yi-jen Chiu - co-chair
  • Wood-hi Cheng - advisor
  • Files
  • etd-0711105-105919.pdf
  • indicate in-campus access immediately and off_campus access in a year
    Date of Submission 2005-07-11

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