Advanced Fiber Resources (AFR) recently released 2 μm Singlemode Fused Coupler/Splitter.

AFR's singlemode two-micron (2000 nm) fiber optic couplers/splitters offer very low insertion loss, low polarization dependence, and excellent enviromental stability. Accurate coupling ratio from 50/50 to 1/99 are available with very good uniformity in a wide wavelength range of 2000 nm windows. Different types of fibers (SMF-28 fiber or Nufern SM 1950 fiber) are available for pigtail connection selection. These components find extensively applications to perform power splitting and mornitoring  functions in all kinds oflaser systems. Customized designs are also available upon request.