Prior to these experiments, it has been possible to transmit only a single wavelength at 40 Gbps using fiber gratings. With this breakthrough, researchers have shown that it's now possible to transmit four wavelengths at 40 Gbps or the equivalent of 160 Gbps using fiber gratings. Over long transmission distances this can cause signal scrambling, preventing a successful decoding of data at the receivers. The problem is particularly challenging when very high channel speeds are attempted over the standard single-mode fiber used in most networks. Among the available techniques for dispersion compensation, fiber gratings offer significant advantages in compactness and freedom from nonlinear effects.
Gratings also offer the ability to tailor the dispersion properties precisely.
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