Oyo Buturi
Online ISSN : 2188-2290
Print ISSN : 0369-8009
Volume 89 , Issue 8
OYO-BUTURI Vol.89 No.8
Showing 1-15 articles out of 15 articles from the selected issue
Science As Art
Editors' Summary
Fundamental Lecture
  • “OYO BUTURI” Editorial Committee
    2020 Volume 89 Issue 8 Pages 478
    Published: August 10, 2020
    Released: August 10, 2020
    Download PDF (319K)
  • Etsushi YAMAZAKI
    2020 Volume 89 Issue 8 Pages 479-483
    Published: August 10, 2020
    Released: August 10, 2020

    Transmission data capacity and its achievable distance were expanded by the invention of digital coherent detection technology utilizing digital signal processing, since digital coherent detection enables polarization multiplexing, quadrature amplitude modulation, and signal distortion equalization. This paper describes the basic principles of the key technical elements such as coherent detection and digital carrier phase lock, chromatic dispersion of optical fiber and its equalization, and adaptive equalization filters for polarization demultiplexing and signal distortion equalization. We give an overview of the general structure of optical transceivers for a digital coherent transmission system including data coding, digital signal processing, and analog components and, we introduce some recent novel techniques.

    Download PDF (616K)