Title page for etd-0710101-144648


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URN etd-0710101-144648
Author Hong-Ting Hsu
Author's Email Address No Public.
Statistics This thesis had been viewed 5096 times. Download 33 times.
Department Electro-Optical Engineering
Year 2000
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Asymmetric Multi-Quantum-Well
Spot-Size Converter Lasers
Date of Defense 2001-06-15
Page Count 65
Keyword
  • Multi-Quantum-Well
  • Asymmetric
  • Abstract Abstract
    The purpose of this thesis is to fabricate l = 1.55mm ridge waveguide spot size converter lasers for high laser-to-fiber coupling. The laser structure design includes the lateral and vertical directions. In the vertical aspect, we use six asymmetric InGaAsP/InP quantum wells of 50, 50, 100, 100, 150, 150Å. The asymmetric multi-quantum-well structure is designed to gather the optical field in the 150Å-wide quantum wells. Besides, we add a passive waveguide near the 150Å-wide quantum wells to expand optical field profile. In the lateral aspect, we use tapered ridge waveguides which have two different fashions: one is tapered down from 2.5mm to 1mm, and the other is tapered up from 2.5mm to 4mm. 
    The results show that the tapered-up ridge waveguide laser has a CW operation with Ith = 34mA and diverge angles of 14°×36° (q//×q^) at room temperature. The tapered-down ridge waveguide laser exhibits only a pulsed operation at room temperature. At lower temperature T = 13°C, the tapered-down laser has a CW operation of Ith = 36mA and diverge angles of 14°×36°(q//×q^). From I-V and C-V measurements, we attribute the heating problem to the large series resistance caused by the incorrect n-type doping profile in the epitaxy process. 
    Advisory Committee
  • T. Y. Chang - chair
  • L. H. Peng - co-chair
  • W. H. Cheng - co-chair
  • T. S. Lay - advisor
  • Files
  • etd-0710101-144648.pdf
  • indicate in-campus access in a year and off_campus not accessible
    Date of Submission 2001-07-10

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