Reflectometry of an optical waveguide using a low coherence refl

Details Reflectometry of an optical waveguide using a low coherence refl Reflectometry of an optical waveguide using a low coherence refl

1994-05-03

1996-08-06

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

359341, 359347, G01N 2184, G01N 2188, H01S 302

Patent

active

055439128

ABSTRACT:
A reflectomerry method and device are disclosed for measuring the loss distribution of an optical waveguide on the basis of Rayleigh back-scattered signals from an optical waveguide under test. Light output from a tunable low-coherent. light source, in which laser oscillation is suppressed, is divided into first and second lights. Local oscillator light is generated by propagating the first light over a variable optical path length determined by a movable mirror. The second light is used as a probe light which is launched into the optical waveguide under test. The local oscillator light is combined with light reflected from the waveguide under test. An average value of the Rayleigh back-scattered signals from the waveguide under test is obtained at respective center wavelengths of the light source by measuring the intensity of the combined light while maintaining the variable optical path length constant and varying the center wavelength of the light source. The average value of the Rayleigh back-scattered signals is thus obtained at a point of the waveguide under test. After changing the variable optical path length by incrementally shifting the movable mirror, the above procedure is repeated to obtain an average value of the Rayleigh back-scattered signals at successive points of the waveguide under test. By thus reducing the number of times the mirror needs to be shifted, the time required for measuring the entire waveguide is reduced.

REFERENCES:
Ultrahigh-Sensitivity Low Coherence OTDR Using Er.sup.3+ -Doped High-Power Superfluorescent Fibre Source, Electronics Letters 2nd Jan. 1992, vol. 28, No. 1, pp. 29-30.
Low Coherence Reflectometry Using Wavelength-Tunable Super-fluorescent Fibre Source, Electronics Letters 8th Jul. 1993, vol. 29, No. 14, pp. 1273-1274.
Jagged Apperance of Rayleigh-Backscatter Signal in Ultrahigh-Resolution Optical Time-Domain Reflectometry Based on Low-Coherence Interference, 1991 Optical Society of America, Optics Letters, vol. 16, No. 18, Sep. 15, 1991, pp. 1433-1435.
Proceedings of the 1993 IEICE Fall Conference, Sep. 5-8, 1993, Sapporo, Hokkaido Institute of Technology, The Institute of Electronics, Information and Communication Engineers, pp. 4-352 Speckle-Noise Reduction in Optical Low Coherence Reflectometry C-272.
Low Coherence Reflectometry Using Automatically-Wavelength-Turnable Fibre Source, C-417, pp. 4-414, Kazumasa Takada, Hiroaki Yamada, Masaharu Horiguchi, NTT Opto-electronics Laboratories, 1994.

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