Abstract: Narrow-line holographic filters that can include a plurality of lines and that can be structured to provide a large aperture device. Materials that can be used to construct filters include glasses, photorefractive crystals such as lithium niobate and photorefractive thick polymers. The filters are fabricated by assembling a plurality of elements having the same one or more narrow line holographic filter patterns written thereon, in mutual orientation such that each element has a surface defined by a length and a width adjacent a corresponding surface of a neighboring element, and has a surface defined by a thickness and one of a length and a width accessible to impinging illumination. Filters exhibiting a plurality of characteristic narrow lines, and having arbitrarily large apertures can be fabricated. Methods of fabricating and using the filters are described.

Abstract: Narrow-line holographic filters that can include a plurality of lines and that can be structured to provide a large aperture device. Materials that can be used to construct filters include glasses, photorefractive crystals such as lithium niobate and photorefractive thick polymers. The filters are fabricated by assembling a plurality of elements having the same one or more narrow line holographic filter patterns written thereon, in mutual orientation such that each element has a surface defined by a length and a width adjacent a corresponding surface of a neighboring element, and has a surface defined by a thickness and one of a length and a width accessible to impinging illumination. Filters exhibiting a plurality of characteristic narrow lines, and having arbitrarily large apertures can be fabricated. Methods of fabricating and using the filters are described.

Abstract: A variable bandwidth signal multiplexer and demultiplexer. Aspects of the multiplexer may include a uniform bandwidth multiplexer with a composite signal output and a plurality of first bandwidth communication signal inputs. The first bandwidth signal inputs may be individually coupled to filters spanning a preselected bandwidth. A first external signal connection may couple to a first one of the first bandwidth communication signal inputs, while a first power divider may couple to a second external signal connection. The first power divider may include a first split output coupled to a second one of the first bandwidth communication signal inputs. The first power divider may also include a second split output coupled to a third one of the first bandwidth communication signal inputs. Aspects of the present invention also provide a demultiplexer that may generally correspond to various aspects of the multiplexer.