For several years, the optical fiber user community has been rapidly shifting from traditional single-mode fibers to new “Full Spectrum” single-mode fibers meeting the International Telecommunications Union (ITU-T) G.652D specification. These Reduced Water Peak (RWP) fibers are considered Full Spectrum because the reduction of loss in the water absorption spectral region (the E band) allows transmission in this previously unusable portion of the spectrum. This supports the exponential bandwidth growth occurring in all networks today. While all RWP fibers have lower loss in the E band (1360 – 1460 nm), not all such fibers are created equal. In fact, there are two very distinct types of these fibers: Low Water Peak (LWP) fibers, which simply lower the loss in the water peak E band of the spectrum; and Zero Water Peak (ZWP) fibers, which eliminate the loss in the water peak and further lower the loss across the entire spectrum. The differences in network support between the two are significant.|For several years, the optical fiber user community has been rapidly shifting from traditional single-mode fibers to new “Full Spectrum” single-mode fibers meeting the International Telecommunications Union (ITU-T) G.652D specification. These Reduced Water Peak (RWP) fibers are considered Full Spectrum because the reduction of loss in the water absorption spectral region (the E band) allows transmission in this previously unusable portion of the spectrum. This supports the exponential bandwidth growth occurring in all networks today. While all RWP fibers have lower loss in the E band (1360 – 1460 nm), not all such fibers are created equal. In fact, there are two very distinct types of these fibers: Low Water Peak (LWP) fibers, which simply lower the loss in the water peak E band of the spectrum; and Zero Water Peak (ZWP) fibers, which eliminate the loss in the water peak and further lower the loss across the entire spectrum. The differences in network support between the two are significant.

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