Article View: comp.arch
Article #20270Re: Cryo-refrigerators
From: J Storrs Hall
Date: Mon, 13 Mar 1989 20:58
Date: Mon, 13 Mar 1989 20:58
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1911 bytes
muir@postgres writes:
>expected - like optic fiber. (The single-mode optic fibers that are in
>the ground right now, have an intrinsic bandwidth of 35,000 gigahertz,
>in the IR window alone. This time, it isn't a typo.)
Correct me if I'm wrong, but does this mean that you could store ~100GB
in a 3000 mile fiber loop?
Is an optical loop a viable storage medium? Some benifits: n access points,
< 1 second access to ALL the data.... Problems: reliability.
Well, if you have something that will switch at 35,000 GHz, let me
know. Optic fiber can be a viable storage medium if we come up with
the appropriate (read photonic) switching capability.
A 3000-mile loop is a bit much, I would think. You don't want that
anyway; it would give you 16 millisecond latency. 3000 miles of
50-micron fiber occupies about 250 cubic meters, the volume of a small
house.
The only reason to talk about fiber is that we have fiber drivers now;
but if we had the photonic switching technology necessary to use it as
a storage medium efficiently, it would be easier to use free-space
storage (bounce the beam around between mirrors). At a reasonable
limit for visible light you can store a bit in about a 5-micron cube
of empty space; this gives you 100 terabytes in an (empty!) 20-inch box.
Need those switches, though.
--JoSH
Technical Details
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<Mar.13.15.58.38.1989.8399@klaatu.rutgers.edu>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!aramis.rutgers.edu!klaatu.rutgers.edu!joshReferences:
<4387@pt.cs.cmu.edu> <13288@steinmetz.ge.com> <4409@pt.cs.cmu.edu> <11020@pasteur.Berkeley.EDU>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!aramis.rutgers.edu!klaatu.rutgers.edu!josh From: josh@klaatu.rutgers.edu (J Storrs Hall) Newsgroups: comp.arch Subject: Re: Cryo-refrigerators Keywords: breakthroughs refrigerators Message-ID: <Mar.13.15.58.38.1989.8399@klaatu.rutgers.edu> Date: 13 Mar 89 20:58:44 GMT References: <4387@pt.cs.cmu.edu> <13288@steinmetz.ge.com> <4409@pt.cs.cmu.edu> <11020@pasteur.Berkeley.EDU> Organization: Rutgers Univ., New Brunswick, N.J. Lines: 30