Asymmetric Y-coupler made from bent channel K+-ion waveguides in glass

A Y-coupler made from bent channel waveguides is discussed. The effect of the geometric parameters of the asymmetric Y-coupler and of the diffusion parameters during the fabrication on the efficiency of optical power transfer to the branching channel is studied. Asymmetric Y-couplers with transfer efficiencies of 2–56% have been developed.