News & Analysis
Slideshow: DesignCon presages silicon photonics era
Rick Merritt
1/31/2013 8:32 PM EST
Tests get looooong--and strange
Click on image to enlarge.
Click on image to enlarge.
The tests for 25G boards involve running ten times or more patterns that are two billion bits long. That can take a couple weeks. Unfortunately, shorter test patterns can return results that are sometimes strangely dissimilar from the long ones, one LSI engineer showed.
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iniewski
2/1/2013 12:05 PM EST
"here comes PAM-2 and -4!"...well, these schemes were used several years ago to get up to 1Gb/s so little has really changed in that respect, throughput numbers are "just" getting bigger
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Adele.Hars
2/1/2013 12:48 PM EST
Just fyi, silicon photonics is almost entirely an SOI-based area -- even for Intel.
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resistion
2/2/2013 10:38 AM EST
The photonic component, e.g., VCSEL, is also power-consuming. Putting it on silicon really defeats the purpose of the low-power designs for the other electronic components.
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yalanand
2/2/2013 11:51 AM EST
Its amazing to know that copper traces can handle 40-50GB/s. I remember in India all telephone lines were using copper cables and it was later replaced with optical cables. I wonder if it was good idea to retain those cables.
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iniewski
2/4/2013 1:17 PM EST
what is the power dissipation for VCSELs?
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martin.rowe
2/4/2013 8:44 PM EST
I've written several blogs, including two slideshows, at www.theconnectingedge.com and
www.designconcommunity.com.
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