High channel density wavelength division multiplexer with defined diffracting means positioning
February 22, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSystem for transmitting independent communication channels through a light-wave medium Holographic multiplexer/demultiplexer Optical waveguide device with phase matching layers Wavelength-selective multiplexer-demultiplexer Optical transmission systems Compact wavelength multiplexer-demultiplexer with variable filtration Optical arrangement having a concave mirror or concave grating Reversible device for the demultiplexing of several light signals in integrated optics Optical wavelength-multiplexing and/or demultiplexing device Patent #: 4748614 InventorsAssigneeApplicationNo. 158396 filed on 02/22/1988US Classes:398/87, Grating359/1, HOLOGRAPHIC SYSTEM OR ELEMENT359/615LIGHT DISPERSIONExaminersPrimary: Griffin, Robert L.Assistant: Van Beek, L. Attorney, Agent or FirmForeign Patent References
International ClassH04B 009/00AbstractA wavelength division multiplexer/demultiplexer having optical path lengths between a fiber array and a Fourier transform lens, and between a dispersion grating and the lens equal to the focal length of the lens. The optical path lengths reduce losses due to angular acceptance mismatch in the multiplexer. Close orientation of the fiber array about the optical axis and the use of a holographic dispersion grating reduces other losses in the system. Multi-exposure holographic dispersion gratings enable the multiplexer/demultiplexer for extremely broad-band simultaneous transmission and reflection operation. Individual Bragg plane sets recorded in the grating are dedicated to and operate efficiently on discrete wavelength ranges. | |
