Patent ID: 7245360
Filing Date: 2007-07-17
Classification: G02B

Abstract:
1. A method of determining the mode field diameter of an optical fiber, comprising the steps of: heating a region of the optical fiber, capturing a hot image of the region of the optical fiber, determining from the hot image a longitudinal intensity distribution along the region of the image corresponding to the core of the optical fiber, determining from the longitudinal intensity distribution a heating center of the hot image, the heating center corresponding to the center of the heated region, wherein the position of the heating center is determined as the point where the longitudinal intensity distribution has a maximum value, determining from the hot image a transverse intensity distribution along a line passing through the image of the heating center, determining from the transverse intensity distribution the width of the image of the core in the hot image, and obtaining from the determined width the mode field diameter of the optical fiber.