Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1980-08-01
1982-11-30
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
356128, 350 15, G01N 2100
Patent
active
043614027
ABSTRACT:
Light from a laser, converted into pulses by a chopper, is trained upon an end of an optical fiber--whose refractive-index profile is to be determined--through a first polarizer, a beam splitter, a focusing objective and a 90.degree. phase shifter, the space between the objective and the fiber end being occupied by a fluid whose refractive index is close to that of the fiber. Light reflected from the fiber end, having passed twice through the phase shifter, has a plane of polarization orthogonal to that of the incident light and is passed by a second polarizer, to which it is directed by the beam splitter, onto a photodiode feeding a calculator that also receives a reference signal from another photodiode to which part of the polarized laser pulses are directly reflected by the beam splitter. Spurious reflections from the objective surface, which do not pass through the phase shifter, retain the original polarization and are rejected by the second polarizer.
REFERENCES:
patent: 2318705 (1943-05-01), Morgan
patent: 4212537 (1980-07-01), Golob et al.
"Measuring Method for the Refractive Index Profile of Optical Glass Fibers, Eickhoff et al., Optics & Quantum Electronics", 7, (1975), 109-113.
"Refractive Index Profile of a Graded Index Fiber: Measurement by Reflection Method, Ikeda et al., Applied Optics", vol. 14, #4, Apr. 1975, pp. 814-815.
"Measurements of the Refractive Index Profile in Optical Fibers: Comparison between Different Techniques", Costa et al., (Second European Conference of Optical-Fiber Communications, undated).
CSELT - Centro Studi e Laboratori Telecomunicazioni S.P.A.
McGraw Vincent P.
Ross Karl F.
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