Title page for etd-0628111-184600


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URN etd-0628111-184600
Author Hui-Hsuan Kung
Author's Email Address No Public.
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Department Electro-Optical Engineering
Year 2010
Semester 2
Degree Master
Type of Document
Language English
Title APSK Transmission Experiment with Homodyne Receiver Using Carrier Phase Recovery
Date of Defense 2011-06-22
Page Count 73
Keyword
  • APSK
  • Modulation format
  • Optical phase-locked loop
  • Coherent detection
  • Digital coherent receiver
  • Digital signal processing
  • Abstract In the current transmission systems, the transmission capacity is still not enough. The information bandwidth of the optical fiber communication system is limited by the optical amplifier bandwidth, and more efficient use of the bandwidth is a very important issue. Therefore, the amplitude and phase shift keying (APSK) is one attractive method of multi-bit per symbol modulation scheme to improve the spectral efficiency, and it can effectively increase the transmission capacity.
    To improve the capacity and the spectral efficiency, the advanced modulation format is effective, and the coherent detection scheme is also effective. However, an optical phase-locked loop (PLL) to lock the local oscillator (LO) phase and the signal phase required for the homodyne detection is still difficult to realize and it makes the receiver circuit complicated. Using the digital coherent receiver, the optical carrier phase information can be recovered by means of the digital signal processing (DSP), and this scheme enables to eliminate the optical PLL circuit by the phase estimation algorithm through the DSP. The stored data can be offline processed by using the MATLAB program.
    This master thesis is focusing on studying the transmission performance of the APSK format using the DSP in the digital coherent receiver. 497km transmission experiment has been conducted. Subsequently, the stored data are offline processed by the algorithms of the DSP. Then, the APSK performances between back-to-back and 497km transmission are compared.
    Advisory Committee
  • Hung-Wen Chang - chair
  • Chin-Ping Yu - co-chair
  • Cheng-Mu Tsai - co-chair
  • Hidenori Taga - advisor
  • Files
  • etd-0628111-184600.pdf
  • indicate in-campus access in a year and off_campus not accessible
    Date of Submission 2011-06-28

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