Patent ID: 6850366
Filing Date: 2005-02-01
Classification: G02B,Y10S

Abstract:
1. A multi-cavity optical bandpass filter for passing only a single passband comprising: a plurality of filter cavities, each cavity including two spaced apart partially reflective films, wherein each partially reflective film is substantially a quarter wave or integer quarter wave in thickness, each cavity also including a spacer layer that is substantially a half wave or an integer multiple of half waves in thickness between the spaced apart reflective films, wherein each cavity has a specific Q factor, wherein the plurality of filter cavities are disposed about a centre of the filter, such that at least two cavities are disposed on each side of the center of the filter and wherein at least one cavity on one side of the center of the filter has a Q factor different than an opposing cavity, on another side of the center of the filter, wherein the at least one cavity and the opposing cavity are each substantially a same distance from the centre of the filter, such that chromatic dispersion for light reflected from a first end of the filter is different from chromatic dispersion for light reflected from a second end of the filter.