Photon probe fault locator for single-mode optical fiber using an acoustooptical light deflector

A new backscattering technique for diagnosing the attenuation characteristics, spatial imperfections with length (fault location), and splice loss in a single-mode optical fiber has been developed by using a TeO 2 acoustooptical light deflector operating at 120 MHz. Due to the small insertion loss and high extinction ratio of the deflector, the dynamic range of the backscattered signal has been increased by at least 10 dB, which corresponds to the extension of 5 km in measurable length for fiber loss of 1 dB/km, compared with the conventional back-scattering technique in which the beam splitter and polarizer-analyzer combination are utilized. Another advantage of this technique is in that the saturation of the amplifier is avoided by arbitrarily cutting off a large power in the early stage of the Rayleigh scattering signal. A single-mode fiber of 19.2 km in length has been examined, and the distance for fault location up to 18.4 km was obtained.

[1]  R. Smith.  Optical power handling capacity of low loss optical fibers as determined by stimulated Raman and brillouin scattering. , 1972, Applied optics.

[2]  N. Shibata,et al.  Measurements of waveguide structure fluctuation in a multimode optical fiber by backscattering technique , 1981 .

[3]  P. Di Vita,et al.  The backscattering technique: its field of applicability in fibre diagnostics and attenuation measurements , 1980 .

[4]  S. Personick,et al.  Photon probe — an optical-fiber time-domain reflectometer , 1977, The Bell System Technical Journal.

[5]  B. Costa,et al.  Splice loss evaluation by means of the back-scattering technique , 1979 .

[6]  N. Uchida,et al.  Acoustooptic deflection materials and techniques , 1973 .

[7]  P. Healey,et al.  Optical time domain reflectometry by photon counting , 1980 .

[8]  E. Brinkmeyer,et al.  Backscattering in single-mode fibres , 1980 .

[9]  S.D. Personick,et al.  Measurements in fiber optics , 1978, Proceedings of the IEEE.

[10]  M. Barnoski,et al.  Fiber waveguides: a novel technique for investigating attenuation characteristics. , 1976, Applied optics.

[11]  Amnon Yariv,et al.  Spontaneous and stimulated Raman scattering in long low loss fibers , 1978 .

[12]  K. Hashimoto,et al.  Optical cable fault location using correlation technique , 1980 .

[13]  B. Sordo,et al.  Attenuation measurements performed by backscattering technique , 1980 .

[14]  P. D. Vita,et al.  Backscattering measurements in optical fibres: separation of power decay from imperfection contribution , 1979 .