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baiwujushi
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re: IBM jumps 'last hurdle' to on-chip optical communication
baiwujushi   3/6/2010 5:51:28 AM
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R_Colin_Johnson
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re: IBM jumps 'last hurdle' to on-chip optical communication
R_Colin_Johnson   3/5/2010 3:54:19 PM
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HP and Intel are both making a lot of noise about turning to optical signals for future chip-to-chip and on-chip communications, but IBM appears to now have an edge as far as its claim to have all the basic components necessary, despite the fact that there is still a lot of hard engineering work ahead before commercialization. But are on-chip optics the future of on-chip communications for everybody? If so, can Intel, HP and others catch up on their own, or will they have license from IBM?



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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