HP Labs Technical Reports



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Extended-Range Optical Low-Coherence Reflectometry Using a Recirculating Delay Technique

Baney, Doug M.; Sorin, Wayne V.

HPL-93-33

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Abstract: We propose a novel technique allowing for a substantial increase in the distance measurement range for optical low-coherence reflectometry. By introducing a recirculating delay into the interferometer reference path, we achieve a one hundred times increase in range compared to previous optical low-coherence reflectometry techniques. At this extended range, a reflection sensitivity greater than -80 dB is demonstrated at a probe wavelength of 1.55 micron.

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