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Re: Sounds like one does in RF modulation
AZskibum   12/11/2013 12:10:53 AM
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.

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

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


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.

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Sounds like one does in RF modulation
Bert22306   12/9/2013 7:46:15 PM
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.

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great research
daleste   12/9/2013 7:16:28 PM
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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