Slow-Light Photonic Crystal WaveguidesKey Enabler For Future Optical Network Technologies PanagiotisKanakis, UOA Thomas Kamalakis, HUA Adonis Bogris, TEI of Athens 18thPanhellenic Conference on Informatics 2-4 October 2014
Outline • Problems and limitations of electronics in optical network nodes. • Optical Transparency : PCW. • PCWapplications. • Designing slow-light PCW. • Conclusions.
Future Problems and Limitations • Future estimation. • Heat dissipation. • Quantum information (qubit)!!!
Optical Transparency • Data format independence. • Opportunity to increase data rate beyond the capabilities of electronics. • Reduction of total power consumption (due to none or less electro-optic conversions). • Less need for heat dissipation techniques (i.e. increase of compactness). • Qubit friendly.
Photonic Crystal Slab 1-D 3-D Slab Waveguide 3-D 2-D Bulk Crystal er: Dielectric constant of the RED material. eb: Dielectric constant of the BLUE material.
Photonic Crystal Waveguide (PCW) Standard W1 waveguide Dispersion Engineered Low Group Velocity Dispersion (GVD), β2 How does this help in optical transparency ?
Photonic Crystal Waveguide (PCW) • Storage Capacity PCW • Wavelength Conversion
Storage Capabilities of PCWs Delay BW Product (DBP) Maximum Storage Capacity Which is the best design? Considered design parameters
Step by Step Optimization Process Design Parameters: Sequence of steps: 5th Step 1st Step 2nd Step
Νmax : 1st Step (Rb=40Gb/s) Band Diagram Storage Capacity Group Index
Νmax : 2nd Step (Rb=40Gb/s) Band Diagram Storage Capacity Group Index
Νmax : 4th Step(Rb=40Gb/s) Band Diagram
Νmax : 4th Step (Rb=100Gb/s) Band Diagram
All-Optical RAM • Array of PCW bit memory. • Total buffering holding time: 168nsec. • Energy and power consumption 24fJ/bit and 10μW respectively. OFC/NFOEC, vol. 1, no. 3, pp. 6-10 March 2011
Wavelength Conversion : FWM Conversion Efficiency Efficiency-BW-Tunability (EBT)
Step-by-step Optimization Process * Unchanged parameter.
Summing Up • We have presented a new design optimization method able to include multiple structural parameters. • New figure of merits (Nmax and EBT) include real aspects (like propagation loss, dispersion and Bandwidth capabilities) to the estimation of more realistic designs. • Generally it is still early for PCW optical memories. • Low capacities is currently the major drawback. • However in the future optical memories will not be an alternative but a necessity due to quantum information. Our opinion This research has been funded under the framework of the “Archimedes III: Funding of Research Groups in TEI of Athens” project of the “Education & Lifelong Learning Operational Programme.”