Optical fibre reflectometer

Details Optical fibre reflectometer Optical fibre reflectometer

1985-08-29

1987-04-21

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

350 9620, G01N 2188

Patent

active

046592164

ABSTRACT:
An optical fibre reflectometer in which the end of the optical fibre 4-port coupler for optical coupling to test fibres is not protected from damage by the use of a sapphire window because of the problems of unwanted reflections that this engenders. Instead the end is coupled to the test fibres by means of a replaceable slug (33) containing a stub length of fibre (20). This fibre stub (20) is intrinsically just as susceptible to cumulative damage when test fibres are repeatedly butted against its end, but it protects the coupler because it is itself butted against the coupler only once in its life. When the cumulative damage becomes excessive the slug can be replaced more simply and cheaply than replacing the whole coupler.

REFERENCES:
patent: 4289398 (1981-09-01), Robichaud
patent: 4351586 (1982-09-01), Phillips et al.
patent: 4474431 (1984-10-01), Bricheno
Comerford et al, "Optical Fiber Coupler" IBM Technical Disclosure Bulletin, vol. 22, #7, Dec. 1979, pp. 2933-2944.
B. S. Kawasaki, K. O. Hill, `Low Loss Access Coupler for Multimode Optical Fibre Distribution Networks`, Applied Optics, vol. 16, No. 7, pp. 1794-1795, Jul. 1977.
M. P. Gold, A. H. Hartog, `A Practical High Performance Single Mode OTDR System for the Long Wavelength Region`, 9th European Conference on Optical Communications, pp. 181-184, Sep. 1983.
M. Nakazawa et al., `Marked Extension of Diagnosis Length in Optical Time Domain Reflectometry Using a 1.32 .mu.m YAG Laser`, Electronics Letters, vol. 17, No. 2, pp. 783-784, Oct. 15 1981.
B. S. Kawasaki, K. O. Hill, and R. G. Lamont, "Biconical-Taper Single-Mode Fiber Coupler", Optics Letters, vol. 6, No. 7, pp. 327-328, (Jul. 1981).

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