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Re: 1300 nm VCSELs


I think that the suggested price differential between
edge and surface emitters is profoundly misunderstood.
At ~1M devices, if someone were to give the dice away,
the total dollar svings would barely make it into two
digits, be it VCSEL, F-P, or DFB. The cost of fibre
coupling the devices, particularly into smf, is
generally greater than that of the device. If people
are waiting for a "magic bullet" component, they're
going to have a long wait.

I'd also take announcements of 1.3u VCSEL's which are
almost ready for prime time with a grain of salt.
We've had another pumped part which has been almost
there for a year.

--- Mike Bennett <bennett@xxxxxx> wrote:
> Folks,
> In order to rekindle discussion regarding PMDs I
> offer the following
> URL:
> As an end user, I had taken the position that only a
> short wave VCSEL
> based PMD could be the lowest cost and thus included
> in the set of PMDs
> that go into the first draft of the standard.  At
> the plenary I had
> heard discussion of 1300 nm VCSELs but told the
> shipping dates of such
> components could be from several months to years
> away.  Essentially, to
> summarize what I as  well as other end users have
> said on the reflector,
> we want "cheap and simple" interfaces for the short
> reach application
> space with simple meaning no mode conditioners and,
> some would argue,
> serial rather than CWDM or WWDM.  Since the
> Novacrystals VCSEL has a
> bandwidth of 2.5 Gbps, its clear this would mean it
> would have to be
> used as some kind of WWDM PMD. I'd like to know if
> anyone has actually
> demonstrated the feasibility of such a PMD or if
> anyone is planning to
> present technical information regarding 1300 nm
> VCSEL based PMDs at the
> interim.  Please forgive me if this has been
> discussed previously.
> Regards,
> Mike
> --
> Mike Bennett
> Energy Sciences Network (ESnet)
> Ernest O. Lawrence Berkeley National Laboratory
> (Berkeley Lab)
> E-mail: bennett@xxxxxx                  Phone: +1
> 510 486-7913

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