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Re: PMD discussion


There is another issue to consider in long haul transmission at these
frequencies; chromatic disbursion. Unless disbursion shifted fibre is used
(which precludes the use of DWDM), 1310nm has much less chromatic
disbursion, which translates into ISI. I'd still vote for 1550nm, because
of the widespread availability of Telcom components, not to mention EDFA's,
but a good case can be made for a high power direct modulated 1310 DFB link
being cheaper for the same performance over SMF28 than an externally
modulated 1550nm link.