Patent ID: 6301042
Filing Date: 2001-10-09
Classification: G02B

Abstract:
An optical interference filter comprising:a substrate having a surface; and an optical cavity, said cavity comprising:a first reflector having a first stack deposited on said surface of said substrate, said first stack including a first plurality of dielectric layers, each of selected ones of said first plurality of dielectric layers having a respective one of a plurality of first optical thicknesses, said plurality of first optical thicknesses varying in a first direction with respect to said substrate within said first reflector;a second reflector having a stack including a second plurality of dielectric layers, each of selected ones of said second plurality of dielectric layers having a respective one of a plurality of second optical thicknesses, said plurality of second optical thicknesses varying in said first direction with respect to said substrate within said second reflector; anda spacer interposed between said first and second reflectors, said optical interference filter having an associated transmission characteristic having first and second passbands, said first passband encompassing at least one optical channel having a wavelength substantially equal to 1.55 .mu.m, said first passband having an associated first transmissivity and said second passband having an associated second transmissivity, said first and second transmissivities being substantially equal to 100%.