Applied Physics A

, Volume 95, Issue 4, pp 955–965

Free-space optical links for board-to-board interconnects

  • Huei Pei Kuo
  • Paul Rosenberg
  • Robert Walmsley
  • Sagi Mathai
  • Lennie Kiyama
  • Joseph Straznicky
  • Moray Mclaren
  • Michael Tan
  • Shih-Yuan Wang
Article

DOI: 10.1007/s00339-009-5144-z

Cite this article as:
Kuo, H.P., Rosenberg, P., Walmsley, R. et al. Appl. Phys. A (2009) 95: 955. doi:10.1007/s00339-009-5144-z

Abstract

We describe two free-space optical links for multichannel optical interconnects. The targeted aggregate data rate is 240 Gb/s. In one implementation we use a unique implementation of telecentric optics and achieved an optical link that is simple, robust, and modular. We describe a simple, inexpensive telecentric lens that can accommodate all optical channels within a 1-mm-diameter sweet zone. We also describe the performance of an optical link with a 4×4 array of VCSELs and matching detectors. The integrity of the optical link is not significantly degraded with a>±2 mm translational misalignment between the VCSEL and detector arrays. With the telecentric optical link, we need only two low-bandwidth, single-axis active servomechanisms to compensate for static tilt and possibly low-frequency thermally-driven shift between the transmitter and receiver arrays. In the other implementaion we use two matching arrays of 1×12 optical fibers. Data are coupled optically through an air gap of 2 mm by means of a pair of collimating microlens arrays that are aligned to one another via precision mechanical subassemblies. We describe a simple, inexpensive, and robust mechanical coupling for the optical link achieved by using miniature high-flux magnets.

Keywords

Optical interconnect Free-space optics Telecentric lenses Board to board optical link Proximity coupler Proximity interconnect Magnetic coupling Misalignment tolerant Parallel optics Lenslet arrays 

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Huei Pei Kuo
    • 1
  • Paul Rosenberg
    • 1
  • Robert Walmsley
    • 1
  • Sagi Mathai
    • 1
  • Lennie Kiyama
    • 1
  • Joseph Straznicky
    • 1
  • Moray Mclaren
    • 1
  • Michael Tan
    • 1
  • Shih-Yuan Wang
    • 1
  1. 1.HP LabsHewlett PackardPalo AltoUSA

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