Popis: |
The fiber nonlinear effective area is a key parameter in long-haul optically amplified single-mode fiber transmission systems (NRZ or soliton): high effective area lowers nonlinear effects, thus allowing larger signal power (1 dB for a 55-to-70-μm2 area increase), improved signal-to-noise ratio, and longer repeater spacing. Indeed, a future transoceanic TAT12/TAT13 NRZ system has a 45-km repeater spacing and 50-μm2-effective-area fibers, whereas 70-μm2 fibers would allow up to 65-km repeater spacing in both NRZ and soliton formats. |