Subject: RE: DWDM Muxing

From: "Walt Carter" <[email-masked]>
Date: Thu, 21 Jun 2001 08:55:46 -0400

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/>

-----Original Message-----
From: Simon Dredge [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]]
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]]
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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