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The attraction of optical backplanes is principally that they can transmit far higher data rates than their electrical counterparts. Using standard multimode optical waveguides the bitrate length product is around 20 GHz.m. Even higher bandwidth-distance products are possible when a complex waveguide structure or mode scrambling is used.

Point-to-point fibre-based products such as AIT’s Flexfoil are currently used in some systems to provide high speed connectivity. However, BPA predict that there will be shift towards embedded guides which offer true backplane capability over the next 2 years. For, an important additional feature of optical backplanes is that the stringent EMI design rules for copper tracks do not apply for optical waveguides. Because of this, there is great design flexibility in the routing of signals within a rack or even chassis backplane.

Optical backplanes for telecom/datacom are expected to be combined electrical/optical structures with multilayer (~16) copper tracks continuing to provide electrical connectivity and an optical layer providing high data rates embedded in the board. See figure 2.


Figure 2 – Embedded Polymer Waveguides

In such embedded boards, the optical layer is protected from damage and interconnectivity between copper tracks in each layer is not affected




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