OPTICAL FIBER TERMINAL OPTICAL DEVICE WITH MICROLENS

摘要

PURPOSE:To improve the reliability of a coupling system and to suppress the quantities of reflection and attenuation by converging a projection light beam into a converged light beam which has focus closer to a lens side than collimator conditions as to a specific optical fiber terminal with a microlens. CONSTITUTION:A 1st optical fiber 8 and a 2nd optical fiber consisting of a light guide-in part 7 which has a single refractive index and the same external diameter at its core part equivalently and a spherical lens part 9 for converging light are connected by fusion splicing on light guide-in sides. Then the optical fiber terminal with the microlens which is long enough to expand luminous flux with a Gaussian distribution which is propagated from the 1st optical fiber 8 to >=80mum at the projection end and has a >=200mum radius of lens curvature is used. A converged beam light beam coupling system which focuses the projection light beam closer to the lens than the collimator conditions is employed. Consequently, the relaxation of adjustment precision for angle deviation and the suppression of reflected return light are both made concrete.