1 / 11

Wavelength-Routing Switch Fabric

Patrick Chiang, Hossein Kakvand, Milind Kopikare, Uma Krishnamoorthy, Paulina Kuo, Pablo Molinero-Fernández Stanford University Optical Routing Seminar 2001. Wavelength-Routing Switch Fabric. Project Goal .

niabi
Download Presentation

Wavelength-Routing Switch Fabric

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Patrick Chiang, Hossein Kakvand, Milind Kopikare, Uma Krishnamoorthy, Paulina Kuo, Pablo Molinero-Fernández Stanford University Optical Routing Seminar 2001 Wavelength-Routing SwitchFabric

  2. Project Goal Build IP Switch Fabric with 64 by 64 ports, each port signaling at 40Gb/s*16λ=640Gb/s per port

  3. f Solution #1—Electrical Switch Fabric • As data rate increases, speed becomes dominated by passive electrical model • Channel attenuation--dielectric loss, skin effect • For switch fabric cabinets far (~10m) from line cards, must use fiber for low channel loss • need o/e and e/o linecard

  4. 40Gb/s*16λ Crossbar chip All Electrical Crossbar • For One-Chip Electricalcrossbar solution, need • 64*2 ports*16λ*2=4096 20Gb/s I/O • Power Consumed=200mW*4096=820W • Power Consumed ~ Entire IP Router

  5. Solution #2—High Speed MEMS Cross-Connect O/E/O MUX Plane K OXC Plane 1 OXC Passive MEMS Diffractive gratings (or other optical element) with at least 10ns switching speed Pulsed Laser Source (Picosecond) on rotary stage O/E/O MEMS OXC (1ms switching speed) Fiber Hide latency

  6. MEMS Switch Is Too Complex K=100 planes (i.e.1μs/10ns) Switching speed achievable = 10 ns Assume packet size = 64Bytes 51.2 Gb/s (per channel)  100 MEMS planes, each with 2*1024=2048 Mirrors • Issues: • Need 10-ns switches and 1μs MEMS • Difficult to align with large number of planes (K)

  7. Arbiter Arbiter Different Router Architectures Electrical Bus Crossbar Switch

  8. VCSEL Array Output Port 1 Input Port 1 1-N ’1 1 K ’K N Output Port N Passive Optical Bus Input Port N 1-N ’1 ’K K Our proposal: Optical Bus • N = 64 ports  64 internal wavelengths • K = 16 external WDM wavelengths  16 processing planes

  9. Passive Wavelength Sorter Collimating lens High Dispersion Wavelength Disperser Output fibers Thermally Expanded Core (TEC) Fiber to couple into fiber better Receiver, possibly with spike filter Input fibers

  10. Advantages • Fast Switching: • As fast as VCSEL modulation • Scalability: • Can add new planes for new external wavelengths • Power: • Passive optical components  minimal power consumption • Space: • 16 Planes, 64*2 fibers per plane

  11. Open Issues • Major Limitations: • Alignment of fibers and other optical elements. • VCSEL arrays with 64 different wavelengths • 64-wavelength sorter (dispersion element) • Does not scale with higher port count • Complexity of the arbiter • Cost factor: • Alignment of the fibers at the coupler.

More Related