Method and apparatus for analyzing optical fibers by inducing Brillouin spectroscopy
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United States of America Patent
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Apr 22, 1997
Grant Date -
N/A
app pub date -
Apr 29, 1994
filing date -
Apr 30, 1993
priority date (Note) -
Expired
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Abstract
For the noninvasive investigation of optical fiber lines by means of heterodyne Brillouin spectroscopy light from a pumplaser (10) is directed into one end of the optical fiber line under investigation (16), so that spontaneous Brillouin backscattering is induced in the fiber (16). The light, which is backscattered by spontaneous Brillouin scattering, is superimposed to a lightwave, which is derived from the pumplaser (10), and heterodyned at the detector (46). The output signal from the detector is fed into a spectrum analyzer (50). A part of the light from the pumplaser (10) is directed into a ring resonator (38). The lightwave, which is derived from the pumplaser (10) and which is superimposed with the light, which is backscattered from the optical fiber line under investigation (16), is generated by stimulated Brillouin scattering inside the ring resonator (38).
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