Patent ID: 6882774
Filing Date: 2005-04-19
Classification: G02B

Abstract:
1. A wavelength division multiplexing (WDM) coupler comprising: a dual fiber collimator assembly having a dual fiber ferrule and a first graded index (GRIN) lens having a proximal end and a distal end, the proximal end opposing the dual fiber ferrule and a metal ring encircling the distal end of the first GRIN lens; a filter device having a holder and a filter, the holder defining a first opening and a second opening in communication with the first opening, a diameter of the first opening being smaller than that of the second opening, the filter being secured inside the holder and covering the first opening; and a single fiber collimator assembly having a single fiber ferrule and a second GRIN lens; wherein an end of the second GRIN lens is inserted into and secured in the first opening of the holder and the first GRIN lens is received in the holder with the metal ring engaging with the second opening of the holder.