Optical filter assembly

Abstract

Various embodiments of an optical filter assembly are disclosed. In one embodiment, the optical filter assembly includes a single pair of optical filters including a first filter having a first optical density, a first bandwidth, and a first center wavelength, and a second filter having a second optical density, a second bandwidth, and a second center wavelength. The first and second center wavelengths may be the same or different. The first filter is configured to reflect a first in-band portion of an incoming optical signal and allow a first out-of-band portion to be transmitted or absorbed. The second filter is configured to reflect a portion of the first in-band portion as a second in-band portion to the first filter, and allow a second out-of-band portion to be transmitted or absorbed. Successive reflections between the two filters result in high in-band transmission and high out-of-band blocking by the optical filter assembly.

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