Optical couplers for fiber optic communication links

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350 96WG, G02B 514

Patent

active

040210995

ABSTRACT:
An optical coupler for a multi-mode optical fiber transmission line consisting of a first length of optical fiber and a second length of optical fiber positioned along a common axis such that one end of the second fiber is spaced a predetermined distance l from one end of the first fiber. This allows a portion of the optical energy leaving the end of first fiber to enter the second fiber. The coupler further includes a reflective surface facing the first fiber to reflect the remaining portion of the optical energy out of the coupler. The percentage of the energy reflected out of the coupler is determined by the distance l and may be varied by moving the second fiber with respect to the first. The material between the ends of the fibers has a refractive index substantially identical to the refractive index of the fiber cores to provide for greater efficiency. A second reflective surface means facing the end of the second fiber may be utilized to reflect and focus optical energy entering the coupler, into the end of the second fiber. The reflective surfaces may be planar, parabolic, spherical, ellipsoidal or any other appropriate shape.

REFERENCES:
patent: 3870396 (1975-03-01), Racki et al.
patent: 3883223 (1975-05-01), Hudson
patent: 3937560 (1976-02-01), Milton
Cooper, "Coupler for Optical Data," IBM Tech. Discl. Bulletin, vol. 16, No. 5, Oct. 1973, pp. 1470-1471.

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