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Technology Stocks : Silkroad -- Ignore unavailable to you. Want to Upgrade?

To: James Fulop who wrote (554)	10/1/1999 8:51:00 AM
From: Srexley	Read Replies (1) \| Respond to of 626

Dubious is not the I was hoping to hear other companies use to describe SilkRoad. On the other hand, Kestrel is a start-up that sounds like it's technology would compete with SR. Wouldn't expect them to say its a better solution than their own.

To: James Fulop who wrote (554)	10/2/1999 6:18:00 AM
From: James Fulop	Read Replies (2) \| Respond to of 626

"SilkRoad Inc. (San Diego), which raised eyebrows last fall in claiming single-wavelength systems that could replace WDM, revealed more of its "refractive synchronization" concepts in a conference paper. SilkRoad uses Mach-Zehnder modulators as "optical tweezers," tapping focused laser light to create a field gradient that causes photons to spiral toward the beam with a specific angular momentum. Photons travel in specified Laguerre orders, and the highest can be used as carrier signals. SilkRoad engineering director Thomas Myers said a patented form of distributed feedback implements refractive-synchronization-based very high-speed bidirectional communications." eet.com

To: James Fulop who wrote (554)	10/2/1999 7:01:00 PM
From: Frank A. Coluccio	Respond to of 626

James, FDM over fiber was one of the first types of commercial implementations of the new medium. To this day it remains a staple in many HFC designs, carrying various secondary RF signal formats in the optical regions of the spectrum to neighborhood nodes, where they are peeled off and sent out to homes for cable tv delivery. AM and FM, both. Before we see the end of this medium's usefulness, I suspect that we will see even more legacious forms of line coding and channel-group stacking (never mind simply CDMA), like differential phase shift keying, various forms of quadrature modulation schemes like QAM, further use of vestigial sideband techniques, etc. Consider, for example, this hypothetical scenario, where perhaps optically-carried CDMA might more gracefully convert to wireless CDMA at antennae sites, without the requisite conversions from SONET or other forms of terrestrial coding schemes, to native CDMA. Just as an example. For the most part, these will address specific niches which do not require the additional baggage of SONET and DWDM. Oh, and one more... [how silly of me], lest we forget to mention the pure embedding of baseband signals onto physical fibers and individual lambdas. And then there is SR, which dependent on their ability to deliver literature which I more fully understand, will also remain a possibility for future consideration. I shall require the assistance of Dr. AHhaha here, however, if you wish to debate this issue. I'm simply a consulting network architect, of sorts, not a theoretical scientist. There were some very sound reasons why FDM was found to be less than desirable during the Late Seventies, thus adding impetus to acceptance of 'digital' transmission schemes, and these reasons will manifest once again, in the optical domain. If this co can demonstrate pricing tradeoffs for those venues which are unaffected by the reasons I'm referring to, then maybe this company has a place for some point solutions worth looking into. Interoperability at major IXC node points, however, is not on their side, if they are proposing that their wares might be used in a pluralistic setting. But, like I say, there may be ample space for this approach in certain situations where they bring a price advantage to the table. Thanks for bringing this to the thread. Now, having said all of this, here's the irony: There is very little difference, in principle, between Optical FDM and DWDM, except for the fact that each of these is taking place in different regions of the spectrum. Okay, the mechanics are not quite the same, but in principle they are very much alike. Regards, Frank Coluccio