Oyo Buturi
Online ISSN : 2188-2290
Print ISSN : 0369-8009
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Volume 89, Issue 8
OYO-BUTURI Vol.89 No.8
Displaying 1-15 of 15 articles from this issue
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Science As Art
Editors' Summary
Fundamental Lecture
  • [title in Japanese]
    “OYO BUTURI” Editorial Committee
    2020 Volume 89 Issue 8 Pages 478
    Published: August 10, 2020
    Released on J-STAGE: August 10, 2020
    DOIhttps://doi.org/10.11470/oubutsu.89.8_478
    JOURNAL FREE ACCESS
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  • Evolution of digital coherent optical transmission technology
    Etsushi YAMAZAKI
    2020 Volume 89 Issue 8 Pages 479-483
    Published: August 10, 2020
    Released on J-STAGE: August 10, 2020
    DOIhttps://doi.org/10.11470/oubutsu.89.8_479
    JOURNAL FREE ACCESS
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    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.

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