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AZskibum
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Re: Sounds like one does in RF modulation
AZskibum   12/11/2013 12:10:53 AM
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I was thinking the same thing -- this is what RF digital comms engineers have done for many decades. The cleverness of their technique appears to be the generation of a perfect "picket fence" of rectangular spectra in the frequency domain -- which inherently results in raised cosine pulses in the time domain. I have to agree with the comment from the researcher, that it's hard to believe nobody thought of this before.

daleste
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Re: great research
daleste   12/10/2013 9:56:51 PM
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A 25% increase isn't the same as 10X.  Thanks for the feedback.  Guess we have to be careful of believing everything we read.

TanjB
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Re: great research
TanjB   12/10/2013 3:15:21 PM
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The original paper

http://www.nature.com/ncomms/2013/131204/ncomms3898/full/ncomms3898.html

makes no claim of 10x.  That was added by the University PR.  You really, really have to learn to avoid repeating the PR spam.

The paper quantifies about a 25% gain relative to OFDM found in a related investigation of Sinc pulses, but does not say they achieved that.

Bert22306
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Sounds like one does in RF modulation
Bert22306   12/9/2013 7:46:15 PM
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If I read this correctly, the idea of shaping the optical symbols to cram as many symbols/sec as possible is what RF engineers have done for a long time. Using smooth shapes, a typical example being the "raised cosine curve," you can reduce the bandwidth of the medium, for any given data carrying capacity.

daleste
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great research
daleste   12/9/2013 7:16:28 PM
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Increasing bandwidth with a transmitter change will be great for the industry.  Not having to replace the optical medium could be an easy upgrade path for existing deployments.  Thanks for the work and learning.



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