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Nonpolarizing Beamsplitters
Feb 2011
Research Electro-Optics Inc. (REO)Request Info
BOULDER, Colo., Feb. 17, 2011 — A new series of 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 deliver broadband, polarization-insensitive operation and good path length matching for the reflected and transmitted beams. This consistently delivers the transmission and channel isolation characteristics required by demanding 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, who says that it avoids these drawbacks by employing all dielectric, ion-beam-sputtered coatings, together with a high-index-of-refraction contrast material set. The result are telecom C-band (1525 to 1570 nm) and L-band (1565 to 1620 nm) beamsplitters that deliver a transmission and reflection ratio of 50% ±1.5% over their entire operating range, with the s and p polarization components matched to within 2%.

A series of high-precision, proprietary fabrication techniques, together with the company’s Activated Covalent Bonding adhesive-free bonding process, enable it to consistently produce cubes with an optical path difference between the two output beams of <3 µm, together with sub arc-minute beam deviation accuracy and low wavefront distortion (surface flatness λ/20 at 633 nm). The beamsplitters are available in the 3- to 12.5-mm-size range and are fabricated from fused silica substrates.


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Exhibiting the characteristic of materials that are electrical insulators or in which an electric field can be sustained with a minimum dispersion of power. They exhibit nonlinear properties, such as anisotropy of conductivity or polarization, or saturation phenomena.
fused silica
Glass consisting of almost pure silicon dioxide (SiO2). Also called vitreous silica. Frequently used in optical fibers and windows.
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