Optical Backscatter Reflectometer Length Measurement Accuracy
■Luna's Optical Backscatter Reflectometers (OBRs) operate on a principle know as Optical Frequency Domain Reflectometry (OFDR). In OFDR, a tunable laser is used as a source for an interferometer formed by a reference arm internal to the instrument and a measurement arm that is connected in line with the Device Under Test (DUT).1 As the laser is swept through an optical frequency range, interference fringe data is collected and analyzed. A Fourier Transform is applied to the raw interferometer fringe data to produce a record of reflection events obsen^ed as a function of the optical time delay which occurs when light propagates from the instrument to the reflection event and back. This Fourier Transform relationship between the optical frequency domain, in which the raw data is collected, and the optical time-of-flight domain, in which the results are presented, is integral to the determination of the OBR length accuracy： length measurement accuracy is primarily constrained by knowledge of the optical frequency range of the acquisition scan.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2014/11/6 |
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Revision 1 |
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263 KB |
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