RE: Proposed WAN vs. LAN Terms (Ethernet HSSG)

["Cornejo, Edward (Edward)" <ecornejo@xxxxxxxxxx>]

I also agree that the impact on laser cost with or without an isolator will
be minimal. Also, the preliminary spec's that were presented at the last
meeting were just that... preliminary. I feel there is much room for
improvement in both distances achieveable, and relaxing spec's to reduce the
cost and availability.

While some folks are bringing forth some interesting discussions, I think we
are premature and should be defining our objectives first.

Ed
LU-Opto

> ----------
> From: 	Yokouchi, Jim[SMTP:JYokouchi@xxxxxxxxxxxxxxxxxxxx]
> Sent: 	Wednesday, May 12, 1999 9:25 PM
> To: 	'Buckman, Lisa'; 'bgregory@xxxxxxxxx';
> BRIAN_LEMOFF@xxxxxxxxxxxxxxxxxxxxxxxxxx
> Cc: 	stds-802-3-hssg@xxxxxxxx; xclairardin@xxxxxxxxx; twhitlow@xxxxxxxxx
> Subject: 	RE: Proposed WAN vs. LAN Terms (Ethernet HSSG)
> 
> 
> Hi everybody,
> 
> Please allow me jumping in.
> I have some comments from the view point of an optical component supplier.
> An isolator that is used in a LD module should not be a expensive parts
> among entire 10Gbps optical module.  
> It is also much cheaper than the inline isolators like in a WDM system
> because of no olarization concern.
> 
> DFB-LD should have it.
> FP-LD might be OK without it for very short distance.
> I would put an isolator on  to keep a better loss budget.
> 
> I believe that a directly modulated laser is very potential solution for
> short reach and intermediate reach application in terms of both cost and
> reliability.  
> It's so simple.
> 
> I have one thing to tell you regarding directly modulated laser.
> A modulation speed is the trade off performance versus extinction ratio of
> output signal.
> If we could relax the extinction spec, we would open device selection,
> including suppliers, significantly wide, I believe.  It reduces a cost, of
> course.
> 
> Even Gigabit Ethernet, only good laser can be used like ours.
> It's not commercial thing, but a serious joke.
> 
> However, if we persist in a tight spec like OC-192, we might miss a
> potential solution.
> If we can use it, we should use it.
> 
> Jim Yokouchi
> Sumitomo Electric Lightwave Corp.
> jyokouchi@xxxxxxxxxxxxxxxxxxxx
> 
> 
> > -----Original Message-----
> > From:	Buckman, Lisa [SMTP:lbuckman@xxxxxxxxxxxxxxx]
> > Sent:	Wednesday, May 12, 1999 7:39 PM
> > To:	'bgregory@xxxxxxxxx'; BRIAN_LEMOFF@xxxxxxxxxxxxxxxxxxxxxxxxxx
> > Cc:	stds-802-3-hssg@xxxxxxxx; xclairardin@xxxxxxxxx; twhitlow@xxxxxxxxx
> > Subject:	RE: Proposed WAN vs. LAN Terms (Ethernet HSSG)
> > 
> > 
> > Bryan,
> > In response to this comment you made: 
> > 
> > "I've heard a number of individuals state 
> > that a directly modulated 10 Gb laser is possible.  Lucent seemed to be 
> > proposing this at the Austin meeting (I believe their eye pattern was
> from
> > one 
> > of these devices).  If this was a directly modulated uncooled DFB
> without 
> > isolator, then I believe it would be by far the lowest cost and the most
> 
> > straight forward."
> > 
> > Just wanted clarify that the directly modulated, uncooled DFB that
> Lucent
> > discussed at the Austin meeting, DOES have an isolator.  I clarified
> this
> > with Lucent after their presentation.  The directly modulated, uncooled
> FP
> > that they discussed does not have an isolator.
> > 
> > Lisa Buckman
> > Hewlett-Packard Laboratories
> > lbuckman@xxxxxxxxxx
> > 
> > 
> > 
> > -----Original Message-----
> > From: bgregory@xxxxxxxxx [mailto:bgregory@xxxxxxxxx]
> > Sent: Monday, May 10, 1999 2:34 PM
> > To: BRIAN_LEMOFF@xxxxxxxxxxxxxxxxxxxxxxxxxx
> > Cc: stds-802-3-hssg@xxxxxxxx; xclairardin@xxxxxxxxx; twhitlow@xxxxxxxxx
> > Subject: Proposed WAN vs. LAN Terms (Ethernet HSSG)
> > 
> > 
> > Hi All,
> > 
> > Just a quick question, is there a "term" defined for the very long reach
> > version
> > of 10GEth?  These definitions seem to be important to our discussion.
> As
> > Brian 
> > from HP stated, we're not being clear on the specific application
> > environment.  
> > I'd suggest something like:
> > 
> > 10,000Base-SX
> >         Multi-mode
> >         Wavelength ~ 850nm
> >         I'd guess WWDM only
> >         300m reach over 62.5um fiber
> > 
> > 10,000Base-LX
> >         Single-mode (maybe also multi-mode)
> >         Wavelength ~ 1310nm or 1550nm
> >         WWDM, Serial or MAS
> >         10km reach
> > 
> > 10,000Base-EX   (EX=Extended Length)
> >         Single-mode
> >         Wavelength ~ 1550nm 
> >         DWDM or Serial
> >         Externally modulated
> >         Long Reach
> >         (similar to what Bill St. Arnaud is talking about)
> > 
> > Also, I've seen some comments on the serial version of the 10,000Base-LX
> > that 
> > assume it'll be externally modulated.  I've heard a number of
> individuals
> > state 
> > that a directly modulated 10 Gb laser is possible.  Lucent seemed to be 
> > proposing this at the Austin meeting (I believe their eye pattern was
> from
> > one 
> > of these devices).  If this was a directly modulated uncooled DFB
> without 
> > isolator, then I believe it would be by far the lowest cost and the most
> 
> > straight forward. Regarding the 10,000Base-EX, I'd (obviously) assume
> that
> > this 
> > was only externally modulated.
> > 
> > Regards,
> > Bryan Gregory
> > bgregory@xxxxxxxxx
> > 630/512-8520
>