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alandal
alandal
12/5/2012 | 4:56:31 PM
re: HP's Newer, Simpler Optical Backplane


Yes? Then at least 2 years away from any real products, maybe more ...

sam masud
sam masud
12/5/2012 | 4:56:30 PM
re: HP's Newer, Simpler Optical Backplane


Why 2 sticks? Is it because one carries traffic one way, and the other in the opposite direction? Just curious...

BigBro
BigBro
12/5/2012 | 4:56:29 PM
re: HP's Newer, Simpler Optical Backplane


Interesting demo. Basically, they're running 4 lanes of RXAUI over a shared optical bus on SR optics.


The killer in the real world is going to be dust -- network gear is not typically deployed in cleanrooms.

Duh!
Duh!
12/5/2012 | 4:56:29 PM
re: HP's Newer, Simpler Optical Backplane


I've occasionally seen schemes for shared optical physical media.  I can't recollect one that involved plastic waveguides with embedded half-mirrors, but haven't followed the space consistently, either.  Looks very interesting.  I'm curious  about how they couple the line cards to the waveguide, how they fabricate the waveguides and plan to achieve manufacturing yields, how they do bus access arbitration and so on.   In any event,  I'm looking forward to technical papers in JLT and/or OFC. 

Rush21120
Rush21120
12/5/2012 | 4:56:26 PM
re: HP's Newer, Simpler Optical Backplane


" factors of speed" is incorrect, any one who knows physics knows plastic and glass have much more latency then electrical conductors like gold, copper etc.   This should be stated as 'capacity' not speed.


This is an interesting concept but lacks manufacturability, cost would be expensive (vs. FR4) and useability (image customers shaking or dropping it).  Getting optical down to the cost of electrical backplanes will take some doing.  The other concern is additional opto-electronics will be required for modules, increasing price as well as compensation compontents (higher speeds, filtering, etc.).


While HP feel they have inovation, which they do, the practicality is unclear - can't wait to see how HP addresses it, it would be pretty cool having photonic backplane, PIC and photonics I/O; but I don't think the manufacturability for the masses are any where in the near term.

^Eagle^
^Eagle^
12/5/2012 | 4:56:26 PM
re: HP's Newer, Simpler Optical Backplane


HP presented this in detail at OIDA earlier this summer.  In that presentation, they gave us answers to all the items you brought up.


Rush, you are making several "assumptions" with no detailed knowledge of data on the HP approach.  


Based on what I saw, HP has thought of and has developed answers and solutions to all the items you bring up.


we all know what "assuming" means.


sailboat.

^Eagle^
^Eagle^
12/5/2012 | 4:56:25 PM
re: HP's Newer, Simpler Optical Backplane


You made several statements that you presented as fact instead of as your opinion.


1) not manufacturable


2) cost


etc.


Those were assumptions with no real knowledge.  I too prefer reality.


I say wait until HP decides to release more information.  


The presentation I saw looked pretty complete.  And I know the scientists and researchers on this project are quite good.  World class in fact.


So, I am willing to give them the benefit of the doubt and take a wait an see approach.


Since I do know a bit about photonics and also FR4, and since I saw that presenation, I think HP has figured out cost side issues.  


IMHO


sailboat

Rush21120
Rush21120
12/5/2012 | 4:56:25 PM
re: HP's Newer, Simpler Optical Backplane


Great then Speedster, when's GA? 


An I never assume anything, nore believe anything.   Reality is always better.

^Eagle^
^Eagle^
12/5/2012 | 4:56:25 PM
re: HP's Newer, Simpler Optical Backplane


I don't know if you are involved in OIDA at all.  But if you do, there is a presentation on the HP approach in one of their archives.  HP showed this solution at an OIDA meeting earlier in the summer.


Note: I never see Lightreading staff at OIDA meetings, nor at OIF meetings, nor at IEEE  meetings.   so often LR only gets the information that is included inside neccessarily short press releases. They might attend some of those forum's, but I have never seen them there.


sailboat

Duh!
Duh!
12/5/2012 | 4:56:25 PM
re: HP's Newer, Simpler Optical Backplane


'fraid I haven't been involved in OIDA for a while, and it looks like the technical stuff is password protected.

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