Title :
Theory and measurements of speed-of-light effects in long cavity fiber Fabry-Perot scanning interferometers
Author :
Hsu, Kevin ; Miller, Calvin M.
Author_Institution :
Micron Opt. Inc., Atlanta, GA, USA
fDate :
7/1/1993 12:00:00 AM
Abstract :
Analytical and experimental results for high-resolution, long-cavity, fiber Fabry-Perot scanning interferometers show an inverse square-root dependence of bandwidth on cavity length when the scan time per fringe approaches the inverse bandwidth of the interferometer. In this regime transmission fringe distortions due to the finite speed of light occur even at moderate scanning rates of 2 to 10 ms per free spectral range for cavity lengths of 5 to 25 m, respectively. A numerical model incorporating propagation and mirror losses in a Fabry-Perot cavity demonstrates good agreement with experimentally observed rise-time increase, fall-time ringing, and overall attenuation of the bandpass function for very long cavity interferometers
Keywords :
fibre optic sensors; light interferometers; optical fibre theory; optical losses; bandpass function; bandwidth; cavity length; fall-time ringing; inverse bandwidth; inverse square-root dependence; long cavity fiber Fabry-Perot scanning interferometers; mirror losses; moderate scanning rates; numerical model; overall attenuation; propagation losses; rise-time; scan time per fringe; speed-of-light effects; theory; transmission fringe distortions; Bandwidth; Distortion measurement; Fabry-Perot; Interferometers; Mirrors; Numerical models; Optical fiber theory; Optical propagation; Propagation losses; Velocity measurement;
Journal_Title :
Lightwave Technology, Journal of
