Title page for etd-0707103-121157


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URN etd-0707103-121157
Author Kuang-Yao Huang
Author's Email Address m9035606@student.nsysu.edu.tw
Statistics This thesis had been viewed 5563 times. Download 1981 times.
Department Electro-Optical Engineering
Year 2002
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title The Study of Super-Wideband ASE Light Source Generated by Cr4+:YAG Crystal Fiber
Date of Defense 2003-06-17
Page Count 69
Keyword
  • amplified spontaneous emission
  • crystal fiber
  • chromium doped ytterbium aluminum garnet
  • Abstract  During the last decade, the maximum capacity of an optical fiber transmission line more than doubled every year to match the fast-growing communication need. The technology break through in dry fiber fabrication opens the possibility for fiber bandwidth all the way from 1300 nm to 1600 nm. The fast increasing demand of communication capacity results in the emergence of wavelength division multiplexing (WDM) technology, enabling tens of channels with different wavelengths transmitted simultaneously on an optical fiber. In consequence, it raises the requirement of spectral bandwidth of all the optical components used in the optical transport networking systems.
     Cr4+:YAG has potential to meet this demand because its 3T2→3A2 transition has a strong spontaneous emission that just covers the low-loss window of optical fiber. The crystalline host offers a excellent mechanical characteristic. Such a fiber is, therefore, eminently suitable for super-wideband optical source since the required pump power is expected to be higher.
     We have successfully demonstrated a diode-laser pumped Cr:YAG crystal fiber ASE light source. The crystal fibers are grown by the laser-heated pedestal growth technique. Using a 46.6 mm-long Cr:YAG single crystal fiber of a 3-dB ASE width of 265 nm and a power spectral density –22.1 dBm/nm was achieved. In the future, to further increase the quantum efficiency and output power we will reduce the core diameter, lengthen the fiber, increase the Cr4+ doping concentration, fabricate double-cladding, coat the fiber facets, and improve the cooling system.
    Advisory Committee
  • Chih-Chung Yang - chair
  • Tao-Yuan Chang - co-chair
  • Lung-Han Peng - co-chair
  • Sheng-Lung Huang - advisor
  • Files
  • etd-0707103-121157.pdf
  • indicate in-campus access immediately and off_campus access in a year
    Date of Submission 2003-07-07

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