Lossless 1×4 Silicon Photonic ROADM based on a Monolithic Integrated Erbium Doped Waveguide Amplifier on a Si3N4 platform

Christos Vagionas*, Apostolos Tsakyridis, Themistoklis Chrysostomidis, Ioannis Roumpos, Konstantinos Fotiadis, Athanasios Manolis, Jinfeng Mu, Meindert Dijkstra, Sonia M. Garcia Blanco, Ruud M. Oldenbeuving, Paulus W.L. Van Dijk, Chris G.H. Roeloffzen, Konstantinos Vyrsokinos, Nikos Pleros, Theonitsa Alexoudi

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)
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During the past years, incorporating ptical Circuit Switches (OCS) in high-bandwidth optical interconnects has outlined the critical challenges of achieving ultra-low fiber-to-fiber losses (FtF) and constantly decreasing costs for Photonic Integrated Circuits (PICs). This work aims to simultaneously satisfy both the low-loss and low-cost requirements by bringing two of the most successful example-technologies in the history of optics, i.e. EDFAs and ROADMs to a common Si<sub>3</sub>N<sub>4</sub> platform. In particular, the proof-of-concept operation of a lossless four-port Silicon Photonic (SiPho) ROADM is experimentally presented for the first time based on two PIC prototypes on a Si<sub>3</sub>N<sub>4</sub> platform, including a monolithic-integrated 5.9cm-long spiral Al<sub>2</sub>O<sub>3</sub>:Er<sup>3+</sup> Erbium Doped Waveguide Amplifier (EDWA) with 15 dB signal enhancement capabilities and a lattice MZI-interleaver ROAM layout with 100 GHz channel spacing. Considering an ultra-low 2.55 dB FtF loss of the ROADM along with 0.5 dB loss for each of the two coupling-interfaces between the Si<sub>3</sub>N<sub>4</sub> and Al<sub>2</sub>O<sub>3</sub>:Er<sup>3+</sup> waveguide layers, a cumulative loss of 3.55 dB is obtained, which can be compensated by the 3.6 dB net gain provided by the EDWA to four incoming WDM signals of -1.7 dBm/channel. Lossless wavelength-routing operation is validated at up to 240 Gb/s WDM (460Gb/s) data traffic, while the cascadability of the proposed device is benchmarked in a realistic two-stage optical bus topology with 10 km single mode fiber that selectively routes 425Gb/s WDM data channels to any of its eight Drop output ports. This work forms the first demonstration of lossless ROADM operation exclusively on SiPho technology, highlighting a promising roadmap for large scale SiPho switching matrices and more complex PICs co-integrated with EDWAs.

Original languageEnglish
Pages (from-to)1718 - 1725
Number of pages8
JournalJournal of lightwave technology
Issue number6
Early online date26 Nov 2021
Publication statusPublished - 15 Mar 2022


  • Optical add-drop multiplexers
  • Optical Amplifiers
  • Optical fiber amplifiers
  • Optical fiber networks
  • Optical losses
  • Optical Networks
  • Optical switches
  • Optical Switching
  • Optical waveguides
  • Silicon Photonics
  • Wavelength division multiplexing
  • Wavelength Routing
  • 22/1 OA procedure


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