Optical Interconnects

Integration technologies for pluggable backplane optical interconnect systems

[+] Author Affiliations
Alexei L. Glebov

Fujitsu Laboratories of America, Device Integration Technology Department, 1240 E. Arques Ave., Sunnyvale, California 94085

Michael G. Lee

Fujitsu Laboratories of America, Device Integration Technology Department, 1240 E. Arques Ave., Sunnyvale, California 94085

Kishio Yokouchi

Fujitsu Laboratories of America, Device Integration Technology Department, 1240 E. Arques Ave., Sunnyvale, California 94085

Opt. Eng. 46(1), 015403 (January 16, 2007). doi:10.1117/1.2432143
History: Received April 24, 2006; Revised May 26, 2006; Accepted June 13, 2006; Published January 16, 2007
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Integration technologies for board-to-board optical interconnect systems are presented. In the module architecture, optical transmitters and receivers are placed on the line cards and the signals are routed to the optically passive backplane through optical jumpers. The backplane contains a light guiding layer with embedded polymer waveguides (WGs) and 45-deg reflector micromirrors. The WGs are fabricated by direct lithographic patterning and have propagation losses as low as 0.05dBcm. The wedge dicing technology is developed for fabrication of the 45-deg micromirrors with 0.5-dB excess losses. The pluggable optical connectors with microlens adaptors couple the light from the optical jumpers into the backplane WGs. Evaluation of the connector alignment tolerances demonstrates a very weak dependence of the coupling efficiency on the axial displacement and a more significant effect of the radial shifts. The presented results show that the displacement tolerances can be substantially improved with auxiliary lenses formed on the substrate. Prototype optical interconnect modules with integrated channel WGs, mirrors, and assembled connectors are fabricated with insertion losses of 5to6dB. The modules successfully pass the high-speed transmission tests at data rates up to 11Gbitss.

© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Alexei L. Glebov ; Michael G. Lee and Kishio Yokouchi
"Integration technologies for pluggable backplane optical interconnect systems", Opt. Eng. 46(1), 015403 (January 16, 2007). ; http://dx.doi.org/10.1117/1.2432143


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