Patent ID: 6421117
Filing Date: 2002-07-16
Classification: G01M

Abstract:
An apparatus for optical time domain reflectometry on multi-mode optical fibers comprising:a light source section for outputting optical pulses, a light-receiving section for receiving the back scattering and Fresnel reflection of optical pulses that are output from said light source section to a multi-mode optical fiber under analysis, and a processing section for processing an electric signal that is output from said light-receiving section, wherein said light source section has a light source, an optical system for focusing the light issuing from said light source, and a multi-mode optical fiber into which an optical beam focused by said optical system is launched, said light source and said optical system are arranged such that the central axis of said light source aligns with the optical axis of said optical system, and said optical system and the multi-mode optical fiber into which an optical beam focused by said optical system is launched are coupled in such a way that the central axis of said multi-mode optical fiber is offset from a focusing point of the optical system by a predetermined length in a direction normal to the axis of said alignment.