OPTICAL BRANCHING AND COUPLING DEVICE

摘要

PURPOSE:To decrease the light to be lost by condensing the light outputted from an optical fiber by plural lenses and inputting the light to the optical fiber connected to the respective lenses. CONSTITUTION:Two pieces of the 2nd waveguide type distributed index lenses 4 having the width smaller than the width of the 1st waveguide type distributed index lens 3 having the refractive index distribution in the direction perpendicu lar to the optical axis within the waveguide plane are connected to the end face of the lens 3 facing the lens end face to which the input fiber 1 is con nected. The optical fibers 5 are connected to the respective lenses 4.