Patent ID: 6198858
Filing Date: 2001-03-06
Classification: G02B,H04J,Y10S

Abstract:
A subassembly for WDM couplers comprisingfirst and second optical fibers, each having an end section terminating in an end face;a cylindrical sleeve having a longitudinal opening snugly holding said end sections of said first and second optical fibers, said sleeve having an end face coplanar with said end faces of said first and second optical fibers;a collimating GRIN lens having first and second end faces, and a longitudinal axis through said first and second end faces, said first end face of said collimating GRIN lens and said end faces of said first and second optical fibers in close proximity to and fixed relationship with each other and said first end face of said collimating GRIN lens;a wavelength-dependent filter fixed to said second end face of said GRIN collimating lens, said wavelength-dependent filter, said collimating GRIN lens longitudinal axis and said end faces of said first and second optical fibers arranged with respect to each other so that light from said first optical fiber and reflected by said wavelength-dependent filter passes into said second optical fiber and light from said first optical fiber and passed by said wavelength-dependent filter leaves said wavelength-dependent filter as collimated light;a hollow cylinder having an interior surface engaging an exterior surface of said cylindrical sleeve; anda cylindrical housing having an interior surface engaging an exterior surface of said hollow cylinder such that said cylindrical sleeve, said end sections of said first and second optical fibers and said collimating GRIN lens are in a centered relationship in said cylindrical housing.