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10GBase-LR/LW Supporting 1550 nm

Hi 

Last week during the serial PMD call I suggested possible need for 
Interoperability between 1550 and 1310 nm.  I was asked to write a
short description.

MY intention was if you have a 1550 nm source assuming you met overload
for the 1300 nm receiver you are allowed to operate with 10GBase-LR/LW 
over 10 Km.  If we look at Table 52-13 the wavelength range currently
specified from 1265-1355 nm.  Without adding any burden we can
define a second window around 1550 nm to allow use of 1550 nm lasers
with 10GBase-LR/LW.  InGaAs/InP detector sensitivity is nearly flat 
in this region and it may only require to specify dual wavelength AR 
coating, which is already very common.

Thanks,

Ali Ghiasi
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