Optical time domain reflectometer (OTDR) with improved dynamic range and linearity
Patent 5621518 Issued on April 15, 1997. Estimated Expiration Date: 
October 10, 2015. 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.
October 10, 2015. 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 ReferencesSignal averaging for optical time domain relectometers Patent #: 4928232 InventorApplicationNo. 540903 filed on 10/10/1995US Classes:356/73.1FOR OPTICAL FIBER OR WAVEGUIDE INSPECTIONExaminersPrimary: McGraw, Vincent P.International ClassG01N 021/88Foreign Application Priority Data1994-11-26 EPAbstractThis invention relates to a method and an apparatus for performing exceptionally linear averaging of digitized signals in an optical time domain reflectometer. Resolutions far below the quantization level of the ADC with improved linearity can be achieved without sacrificing dynamic range. Such method can be used to improve measurement accuracy on optical fibers under test.Other References
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