Cube beamsplitters from REO are intended for demanding dense wavelength division multiplexing applications in telecommunications. Optimized for use in Gires-Tournois interferometer-based interleavers and dispersion compensators, the nonpolarizing beamsplitters provide broadband, polarization-insensitive operation and suitable path length matching for reflected and transmitted beams. This technology offers the transmission and channel isolation characteristics required by long-haul and metro network applications. Traditional nonpolarizing beamsplitters are limited by either a narrow operating band or high internal absorption, according to the company, which says that it avoids these drawbacks by employing all-dielectric, ion-beam-sputtered coatings, together with a contrast material set with a high index of refraction. The devices are available in sizes from 3 to 12.5 mm and are fabricated from fused-silica substrates.