Optical sensor having a non-negligible source coherence length
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United States of America Patent
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May 7, 2013
Grant Date -
Nov 8, 2012
app pub date -
Jun 11, 2012
filing date -
Nov 15, 2007
priority date (Note) -
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Abstract
An optical sensor, a method of configuring an optical sensor, and a method of using an optical sensor are provided. The optical sensor includes an optical waveguide having a length and a laser source optically coupled to the waveguide. The laser source has a coherence length. Light from the source is transmitted to the waveguide as a first signal propagating along the waveguide in a first direction and a second signal propagating along the waveguide in a second direction opposite to the first direction. The optical paths of the first signal and the second signal are substantially reciprocal with one another and the first signal and the second signal are combined together after propagating through the waveguide to generate a third signal. The coherence length is greater than 1 meter or is in a range between 200 microns and 10 centimeters.
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