Patent ID: 9110246
Filing Date: 2015-08-18
Classification: G02B,H01S

Abstract:
1. An optical system comprising: a focusing component configured to focus a beam incident thereon so that the focused beam includes a plurality of rays converging towards an axis at an angle range which is characterized by a small numerical aperture (NA) at most equal to a target NA, and another angle range characterized by a high NA at least equal to the target NA; an elongated ferrule extending along a longitudinal axis and having an inner surface defining an inner central channel; and an optical fiber extending coaxially with and disposed in the central channel with an upstream end of the fiber being spaced inwards from an upstream end of the ferrule at a predetermined distance D to create a void at a terminus of the ferrule, wherein substantially only the small NA rays enter the terminus and are coupled into a core of the fiber.