On Mon, Feb 4, 2013 at 12:03 PM, Masataka Ohta < mo...@necom830.hpcl.titech.ac.jp> wrote:
> Scott Helms wrote: > > Here is the architecture document: >> http://static.**googleusercontent.com/**external_content/untrusted_** >> dlcp/research.google.com/en/**us/pubs/archive/36936.pdf<http://static.googleusercontent.com/external_content/untrusted_dlcp/research.google.com/en/us/pubs/archive/36936.pdf> >> > > The document, seemingly, does not address drop cable cost > difference. > > It does not address L1 unbundling with WDM-PON, which > requires fiber patch panel identical to that required > for SS, either. > They're not doing WDM-PON or any flavor of PON at all. Its entirely an Active Ethernet deployment. > > As for power consumption at CO, all the transmitters do not > have to have power consuming LDs but can just have modulators > to modulate light from a shared light source, which has already > happened with QSFP+: > > http://www.luxtera.com/faqs/ > > How do you generate light in silicon? > > Actually, we don't. Silicon is a bad material to try and > build lasers in. Some silicon lasers have been demonstrated, > but these are completely impractical. As it turns out there's > no need to build a silicon laser: lasers are already very > inexpensive (remember, there's already one in every PC > - inside the CD/DVD player). The challenge has been finding > an inexpensive way to attach the lasers to silicon. Solving > this problem, and the related one of inexpensively attaching > optical fibers to silicon, is a key piece of Luxtera's > intellectual property. We think of a laser as being just > like a DC power supply – only it provides a steady stream of > photons rather than electrons. > > Masataka, are your trying to participate in the conversation or sell gear? The laser used in your DVD player is NOT suitable for a broadband deployment. > Masataka Ohta > > -- Scott Helms Vice President of Technology ZCorum (678) 507-5000 -------------------------------- http://twitter.com/kscotthelms --------------------------------