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Photonic Integrated Circuitry

Photonic Integrated Circuitry. Duncan MacFarlane The University of Texas at Dallas Gary Evans Southern Methodist University. Jack Kilby’s revolutionary integrated circuit. Introduction. Early electronic filters used only L, C and R’s – “Passive Filters”

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Photonic Integrated Circuitry

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  1. Photonic Integrated Circuitry Duncan MacFarlane The University of Texas at Dallas Gary Evans Southern Methodist University Jack Kilby’s revolutionary integrated circuit

  2. Introduction • Early electronic filters used only L, C and R’s – “Passive Filters” • Gain elements, first vacuum tubes, later transistors, allowed “Active Filters” • Current optical filters are purely passive • It is time to develop optical filters with gain that are higher performance, and adaptive We are developing a manufacturable, programmable, Photonic Integrated Circuit!

  3. G G tk-1 Tk(z) tk Tk+1(z) Z-1/2 + + rk-1 -rk-1 rk -rk Rk(z) Rk+1(z) Z-1/2 + + tk-1 tk Active Lattice Filters An active optical filter has a gain element that allows the weights associated with the different poles and zeroes to be tuned. • Gain allows: • Improved quality factors • Adaptive filters • Lattice Filters good for: • Linear Prediction • Frequency Discrimination • Robust wrt realization limitations Gain Block Delay Block

  4. Surface Grating Photonic IC We are using the GSE technology for integrated active optical filters Grating Gain Region

  5. Four Directional Couplers • Grating can couple in multiple directions • Input/output • Mesh structure • FIB nanostructure • Holographic lithography • Two step process • Crossed Gratings

  6. 2D GSE Lattices: “Thick Linear”

  7. Two Dimensional GSE Lattices Completely new filter structure solved by layer peeling with 2nx2n matrices … Research is benefiting fundamental DSP engineering ~60 um

  8. Two Dimensional GSE Lattices • Multiple Input, Multiple Output Applications • Add/drop applications, dwdm, o-cdma on same chip • Cross correlators, decouplers, cross-talk cancelation • multi-trajectory tracking, joint process estimation • Fully Tunable … programmable • Extends the palette of filter realizations for optimal implementations

  9. Frequency Selection Stable operation with Q >75,000

  10. Bandpass Frequency Tuning via Gain

  11. Economically Viable Device • Structure is highly manufacturable • Standard Epitaxy • Photolithographic gratings • Last step in process • No regrowth • Chip scale process (parallel) • Being commercialized for lasers • Basic structure can be standardized for fabrication purposes • Individual users may then program them for a particular application • Just like an FPGA or a DSP

  12. Outcome of the Research Program • Standardized Photonics • Two dimensional lattice has wealth of transfer functions supporting widespread applications • Programming determines application • Basic advances in DSP • Two dimensional structure is new • Highly appropriate for MIMO applications 100 GHz clock rates and GHz tuning rates will enable high volume information engineering applications

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