A Reconfigurable OADM Architecture for High-Order Regular- and Offset- QAM based OFDM Super-Channels

Kyriakos Vlachos, Filipe Marques Ferreira, Stylianos Sygletos

Research output: Contribution to journalArticlepeer-review


We investigate the performance of a Reconfigurable All-Optical Add Drop Multiplexer (ROADM) architecture, that is suitable of supporting high-order regular and offset based QAM signals. The design is based on a highly modular interferometric, structure, in which OFDMA sub-channels remain in the optical domain. Sub-channel extraction is achieved via waveform splitting and coherent subtraction. Numerical studies have been carried out to validate performance and optimize critical parameters of the add/drop process. Particularly, input parameters like the signal extinction ratio, pulse rise time, switching window and input power levels have been optimized for single sub-carrier add/drop operation, from an OFDM super-channel comprising seven optical sub-carriers with 10 GHz spacing. Results have shown that the proposed ROADM architecture can accommodate and process both regular and offset based high-order QAM signals.
Original languageEnglish
Article number8667642
Pages (from-to)4008-4016
Number of pages9
JournalJournal of Lightwave Technology
Issue number16
Early online date15 Mar 2019
Publication statusPublished - 15 Aug 2019

Bibliographical note

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Funding: Τhis work has been partially supported by the EU-ICT project
FOX-C (grant number 318415) and by the Engineering and Physical Sciences
Research Council (EPSRC) through PEACE (EP/L000091/1) and TRANSNET
(EP/R035342/1) projects.


  • Add-drop multiplexing
  • QAM signals
  • coherent detection
  • optical superchannel


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