Multi-bandpass filter

Details Multi-bandpass filter Multi-bandpass filter

2007-06-05

2007-06-05

Amari, Alessandro (Department: 2872)

Optical: systems and elements

Light interference

Produced by coating or lamina

C359S589000

Reexamination Certificate

active

11151590

ABSTRACT:
Several embodiments of multi-bandpass filters for processing optical signals are shown. The filters may include a transparent substrate with a thin film superimposed thereon. The thin film may have mirror layers and cavity layers, and may have multiple kinds of dielectrics with different refractive indices. The optical film may have a thickness that is a quarter of a reference wavelength, so as to form a plurality of Fabry-Perrot interferometer structures, and may have multiple groups of superimposed mirror and cavity layers depending on the desired effect. By using the described filters, the isolation between a plurality of the transmission bands can be sufficiently large, and separation of lights in a plurality of different wavelength regions can be carried out through a single multi-bandpass filter.

REFERENCES:
patent: 5926317 (1999-07-01), Cushing
patent: 6631033 (2003-10-01), Lewis

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