Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1994-04-29
1997-04-22
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2188
Patent
active
056233361
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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Creighton Wray James
McGraw Vincent P.
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