Subject: RE: DWDM Muxing

From: Simon Dredge <[email-masked]>
Date: Thu, 21 Jun 2001 10:43:25 -0700

Sorry - I thought that Chrysostomos was asking about component-level DWDM,
not system-level (i.e. by muxes, I presumed AWG's).  Interested, though, Re.
the 1.6T - Is that using 2 x 80ch. AWG's w/ 10Gbps Channels @ 0.4 nm or 4 x
40ch AWG's w/10Gbps channels @ 0.8nm interleaved at 50Ghz intervals? I
suppose it could even be 4 x 40ch 'banded' AWG's coupled with a thin-film
filter...... anyway, I'm not in the LH optics biz , nor am I an engineer, so
maybe I should keep my mouth shut in the future ;-)

-----Original Message-----
From: Chima Chima [mailto:[email-masked]]
Sent: Thursday, June 21, 2001 10:20 AM
To: 'Roberto Simongini'; 'Simon Dredge'
Cc: 'Walt Carter'; 'Hart, Jim'; 'Chrysostomos Tziouvaras'; 'mpls';
'mpls-ops'; 'ip-optical'
Subject: RE: DWDM Muxing

Simon,
           Lucent 1.6 T  long haul system is capable of 80 channels C-Band
and 80 Channel L-Band.
This product has already been deployed by Time Warner.
 
Chima E. Chima
 
LWS/ESS/ONG
New York City

-----Original Message-----
From: Roberto Simongini [mailto:[email-masked]]
Sent: Thursday, June 21, 2001 10:25 AM
To: Simon Dredge
Cc: Walt Carter; Hart, Jim; 'Chrysostomos Tziouvaras'; mpls; mpls-ops;
ip-optical
Subject: RE: DWDM Muxing

Simon, 

40 Channels  (C-Band) plus 40 (L-Band) are already commercialy available on
OPTEra L(ong) H(aul) DWDM products Family 
from NORTEL Networks. I may send you (as well as to other colleagues) some
Doc if might be of your interest. Regards. 
Roberto. 

Roberto Simongini 
NORTEL NETWORKS S.p.A. 
Wireless Solutions Engineering Director 
Unified Networks Solutions 

Via di Grotta Perfetta, 643 
00144 - ROMA 

Tel:    +39-06 5152 XT9234 (ESN 794 9234)       
Mobile: +39-(0) 348 2611 829 
        e_mail: [email-masked] 

-----Original Message----- 
From: Walt Carter [ mailto:[email-masked]
<mailto:[email-masked]> ] 
Sent: giovedì 21 giugno 2001 14.56 
To: Simon Dredge; Hart, Jim; 'Chrysostomos Tziouvaras'; mpls; mpls-ops; 
ip-optical 
Subject: RE: DWDM Muxing 

In today's DWDM systems, wavelength spacing occurs at 0.8 nm or 100-Ghz 
steps. Future systems will space wavelengths at 0.4 nm or 50 Ghz, to further

increase the capacity of existing fibers. The ITU has set specifications 
that list the channel code and wavelength for each optical signal 
multiplexed into a fiber. Present ITU specs recommend 81 channels, starting 
at a center frequency of 196.10 THz (1528.77 nm) and decreasing in 80 steps 
of 50 GHz (~0.39 nm) each. The ITU uses as its starting point a 193.10-THz 
reference frequency that corresponds to a spectral line for krypton gas. The

ITU specified frequency rather than wavelength because wavelength depends on

a transmission medium, and thus it can vary. Frequency is a physical unit 
that will not vary as a signal goes from one medium into another, say from 
glass into air. 

Regards, 
Walter S. Carter 
kSi group, inc 
(770) 460-2062 Office 
(678) 362-4504 Mobile 
2 WAY: <[email-masked]> 
< http://www.ksigroup.net/ <http://www.ksigroup.net/> > 

-----Original Message----- 
From: Simon Dredge [ mailto:[email-masked] <mailto:[email-masked]>
] 
Sent: Wednesday, June 20, 2001 12:50 PM 
To: Hart, Jim; 'Chrysostomos Tziouvaras'; [email-masked]; 
[email-masked]; [email-masked] 
Subject: RE: DWDM Muxing 

I believe 40-Channel Muxes (full c-band) are in the works and will be 
available soon 

-----Original Message----- 
From: Hart, Jim [ mailto:[email-masked] <mailto:[email-masked]>
] 
Sent: Wednesday, June 20, 2001 9:09 AM 
To: 'Chrysostomos Tziouvaras'; [email-masked]; [email-masked]; 
[email-masked] 
Subject: RE: DWDM Muxing 

it depends, but 32 is pretty common 

-- 
Jim Hart 
Director, Data Engineering 
ICG communications 
[email-masked] 
303-414-5856 
cell- 720-320-0618 

-----Original Message----- 
From: Chrysostomos Tziouvaras [ mailto:[email-masked]
<mailto:[email-masked]> ] 
Sent: Wednesday, June 20, 2001 9:02 AM 
To: [email-masked]; [email-masked]; [email-masked] 
Subject: DWDM Muxing 

Hi, 
do you know what's the state of the art in the number of channels in DWDM 
muxers? 

Thanks 
Chrysostomos Tziouvaras 
ICS-FORTH Researcher 

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