<amplifier to work at 1310nm wavelength? >
Hello-- Just as a helpful note, the generally accepted practice in the field is that the long haul transport will take place in the
1500 nm passband. There are advantages to working here, dispersion
effects, attenuation and all that, are a a minimum. The "D" in DWDM
applies to the squeezing of multiple, evenly spaced wavelenghts in this passband. WDM refers to the use of multiple wavelengths at any
of the accepted transmission wavelengths, 830, 1310, 1400, 1550 etc.
WDM is a lot easier to do than DWDM at 1550, but then again, you don't
get 16,40, 96 or more channels. DWDM because of the tight wavelength
spacings at 1550, poses more of a demand on the quality of the fiber
to make certain that "crosstalk" does not occur and other deleterious
effects do not confuse transmissions. Amplifiers at any wavelength
get you into more serious problems; non-linear effects (ASE) and polarization effects. Most of the amplifier development has taken place for the 1500 nm passband and the electo-optics as well. Amplifiers and schemes for 1310 nm are of interest, but the long
haul stuff will be at the DWDM passband at 1500-1580 nm.
At this present time, only CIEN has shipping products for 40 channels
of DWDM in the 1500 nm passband. |
