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Optical Interconnections for Circuit Communication

Optical Interconnections for Circuit Communication. Robert Knight. Optical Interconnect Basics. Requires Laser source for all chips Signals travel on optical waveguides – can be made of Si or special polymers. Example. Waveguides. Si waveguide Consumes Si resources Refractive index ~ 3.5

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Optical Interconnections for Circuit Communication

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  1. Optical Interconnections for Circuit Communication Robert Knight

  2. Optical Interconnect Basics • Requires Laser source for all chips • Signals travel on optical waveguides – can be made of Si or special polymers.

  3. Example

  4. Waveguides • Si waveguide • Consumes Si resources • Refractive index ~ 3.5 • Narrower but Slower • Polymer waveguide • Requires additional layer • Refractive index ~ 1.4 • Wider and Faster

  5. Performance Comparison: Power • Traditional Electrical connections consume less power at small distances.

  6. Performance Comparison: Latency • Optical connections are again clearly superior for longer lines. • Offer improved performance for smaller chips.

  7. Performance Comparison: Increasing Bandwidth Density

  8. Limitations • Cost • Power • Off board LASER requirement • 90° angles difficult

  9. References • Guoquing, Chen et. Al. Predictions of CMOS Compatible On-Chip Optical Interconnect. SLIP Conference. April 2, 2005. • Hashim, A. et. Al. Cost-effective 10 Gb/s polymer-based chip-to-chip optical interconnect. IET Optoelectronics. 11th January 2012. • Koo, Kyung-Hoae et. Al. Performance Comparisons Between Carbon Nanotubes, Optical, and Cu for Future High-Performance On-Chip Interconnect Applications. Ieee Transactions On Electron Devices, VOL. 54, NO. 12. December 2007.

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