Patent ID: 6215924
Filing Date: 2001-04-10
Classification: G02B

Abstract:
An optical coupler device, comprising:a first lens having an outer endface and an inner endface with a first optical axis therethrough;a first waveguide on the outer endface of the first lens on one side of the first optical axis;a second lens having an outer endface and an inner endface with a second optical axis therethrough, the second lens in coaxial alignment with the first lens so that the first optical axis and the second optical axis form a common optical axis;a second waveguide on the outer endface of the second lens on one side of the second optical axis, the second waveguide positioned at a non-zero angle with respect to the second optical axis; anda narrow bandpass optical filter disposed between the inner endface of the first lens and the inner endface of the second lens, the optical filter having channel spacings of about 100 GHz or less;wherein the optical coupler device minimizes angle dependent loss in the optical filter.