{"id":11453,"date":"2025-10-07T15:19:31","date_gmt":"2025-10-07T13:19:31","guid":{"rendered":"https:\/\/www.institut-foton.eu\/?p=11453"},"modified":"2025-11-26T09:34:30","modified_gmt":"2025-11-26T08:34:30","slug":"these-dylan-chevalier-26-11-2025","status":"publish","type":"post","link":"https:\/\/www.institut-foton.eu\/en\/these-dylan-chevalier-26-11-2025\/","title":{"rendered":"PhD defense – Dylan Chevalier \u2013 26\/11\/2025"},"content":{"rendered":"\n

The Foton Institute invites you to the presentation of doctoral thesis work:<\/strong><\/p>\n\n\n\n

<\/p>\n\n\n\n

Improving optical access networks through analog equalization<\/em><\/strong><\/p>\n\n\n\n

Dylan Chevalier<\/p>\n\n\n\n

under the supervision of Monique Thual and Pascal Scalart<\/p>\n\n\n\n

This public defense will occur wednesday 26 november 2025 at 10h00 in Enssat room 020G.<\/strong>
<\/p>\n\n\n\n

Zoom link to attend the Defense online :<\/p>\n\n\n\n

https:\/\/univ-rennes1-fr.zoom.us\/j\/61652406667<\/a>
meeting ID: 616 5240 6667
key: 292235<\/p>\n\n\n\n

Jury members:<\/em><\/p>\n\n\n\n

    \n
  1. *Prof. Ghaya Rekaya-Ben Othman, *Institut Polytechnique de Paris,
    Reviewer<\/li>\n\n\n\n
  2. *Assoc. Prof. Yannis Le Guennec, *Universit\u00e9 Grenoble Alpes, Reviewer<\/li>\n\n\n\n
  3. *Prof. Catherine Lepers, T\u00e9l\u00e9com SudParis, *Committee Member<\/li>\n\n\n\n
  4. *Prof. Monique Thual, Universit\u00e9 de Rennes, *Thesis directress<\/li>\n\n\n\n
  5. *Prof. Pascal Scalart, Universit\u00e9 de Rennes, *Thesis co-director<\/li>\n\n\n\n
  6. *Dr. Ga\u00ebl Simon, Senior Researcher, Orange Innovation, *Supervisor<\/li>\n\n\n\n
  7. *Dr. Laurent Bramerie, Senior Researcher, Institut FOTON, *Supervisor<\/li>\n<\/ol>\n\n\n\n

    Keywords:<\/em> Analog equalization, FFE, 50G-PON, FEC, LDPC<\/p>\n\n\n\n

    Summary:<\/em><\/p>\n\n\n\n

    In the context of passive optical networks (PON), the move towards
    50G-PON, which targets data rates of up to 50 Gbit\/s, is accompanied by
    technical challenges linked to the interference between symbols created
    by chromatic dispersion and the reduced bandwidth of the low-cost
    components used. To compensate for these degradations, channel
    equalization is essential, and can be implemented using either Digital
    Signal Processing (DSP) or Analog Signal Processing (ASP). More
    economical and less energy-intensive, the analog solution avoids the
    need for costly high-rate analog-to-digital converters, but must contend
    with certain imperfections specific to analog solutions. This thesis
    proposes a method for optimizing an analog FeedForward Equalizer (FFE)
    based on the minimum mean square error criterion, with experimental
    validation in the electrical and optical domains. Results show a
    significant reduction in the bit error rate and an improvement in the
    eye diagram. Secondly, the study examines the combination of an analog
    FFE with a Hard-Input Forward Error Correction (HI-FEC), in order to
    compare this approach with the digital one. It is shown that an analog
    FFE combined with HI-FEC can offer performance close to that of a
    digital solution based on Soft-Input FEC (SI-FEC), while being more
    affordable and less power-hungry. These results underline the relevance
    of the analog approach in meeting 50G-PON requirements.<\/p>\n","protected":false},"excerpt":{"rendered":"

    The Foton Institute invites you to the presentation of doctoral thesis work: Improving optical access networks through analog equalization Dylan Chevalier under the supervision of Monique Thual and Pascal Scalart This public defense will occur wednesday 26 november 2025 at<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[37,9],"tags":[],"class_list":["post-11453","post","type-post","status-publish","format-standard","hentry","category-agenda","category-non-classe"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"en","enabled_languages":["fr","en"],"languages":{"fr":{"title":true,"content":true,"excerpt":false},"en":{"title":true,"content":true,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/11453","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/comments?post=11453"}],"version-history":[{"count":7,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/11453\/revisions"}],"predecessor-version":[{"id":11781,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/11453\/revisions\/11781"}],"wp:attachment":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/media?parent=11453"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/categories?post=11453"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/tags?post=11453"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}