Patent ID: 6741771
Filing Date: 2004-05-25
Classification: G02B,H04J

Abstract:
A structure for adjusting waveforms of optical filters used in a Dense Wavelength Division Multiplexing system, said structure comprising:an input optical fiber and a return optical fiber; a biporose pigtail with two holes defined therein, the input and return optical fibers being secured in the holes; a graded index lens coupled with the pigtail at a first end of the graded index lens, whereby signals transmitted from the input fiber can enter the graded index lens; and a filter being parallel to and joined with a second end of the graded index lens, wherein the second end is opposite to the first end of the graded index lens, and the second end of the graded index lens is oriented at a first acute angle relative to a line that is perpendicular to an optical axis thereof, whereby the reflected signal from the filter can be transmitted through the graded index lens to the return fiber.