Patent ID: 6487338
Filing Date: 2002-11-26
Classification: G02B,H04B

Abstract:
A fiber optic system, comprising:a light source, emitting light into a first singlemode fiber; a graded-index multimode fiber; a length of a second singlemode fiber whose transmission mode profile specially selected to closely match the fundamental mode profile of said graded-index multimode fiber; cladding of said second singlemode fiber coated with a coating for stripping light in cladding modes of said second singlemode fiber; output end of said first singlemode fiber attached coaxially to the input end of said second singlemode fiber by butt-coupling means, launching said light into said second singlemode fiber; output end of said second singlemode fiber attached coaxially with the input end of said graded-index multimode fiber by butt-coupling means, for launching said data light into said graded-index multimode fiber; wherein profile-matching of said transmission mode of said second singlemode fiber with said fundamental mode of said graded-index multimode fiber permits said light in said second singlemode fiber to be launched exclusively into said fundamental mode of said graded-index multimode fiber.