Optical low-coherence reflectometer using optical attenuation

Details Optical low-coherence reflectometer using optical attenuation Optical low-coherence reflectometer using optical attenuation

1994-03-18

1994-11-15

Housel, James C.

Optics: measuring and testing

By particle light scattering

With photocell detection

356 731, 25022719, 385 12, G01B 902

Patent

active

053653351

ABSTRACT:
A low-coherence reflectometer for use in measuring optical backscattering. The invention utilizes an optical attenuation in the reference arm of a Michelson interferometer to reduce the relative intensity noise. The invention obtains essentially the same performance as obtained with balanced detector schemes while maintaining the simplicity of the Michelson interferometer design and increased scan distance.

REFERENCES:
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patent: 4997277 (1991-03-01), Horiguchi et al.
patent: 5268738 (1993-12-01), Baney et al.
patent: 5268741 (1993-12-01), Chou et al.
patent: 5291267 (1994-03-01), Sorin et al.
Takada, et al., "Rayleigh Backscattering Measurements of Single-Mode Fibers by Low-Coherence Optical Time-Domain Reflectometry with 14mm Spatial Resolution", Appl. Phys. Lett., 59, p. 143, 1991.
Takada, et al., "Phase-Noise and Shot-Noise Limited Operations of Low Coherence Optical Time Domain Reflectometry", Appl. Phys. Lett. 59 11 Nov. 1991, pp. 2483-2485.
Masaru Kobayashi et al., "Optical Fiber Component Characterization by High-Intensity and High-Spatial-Resolution Interferometric Optical-Time-Domain Reflectometer", IEEE Photonics Tech. Letters, vol. 3, No. 6, Jun. 1991, pp. 564-566.
Takada, et al., "Ultrahigh-Sensitivity Low Coherence OTDR Using Er.sup.3+ -Doped High-Power Superflourescent Fibre Source", Electronics Letters, Jan. 1992, vol. 28, No. 1, pp. 29-31.

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