Low loss access coupler for multimode optical fiber distribution

Details Low loss access coupler for multimode optical fiber distribution Low loss access coupler for multimode optical fiber distribution

1977-06-13

1981-09-29

Lee, John D.

65 42, G02B 5172

Patent

active

042919401

ABSTRACT:
The low loss access coupler includes two multimode optic fibers, each having a biconical taper section. The biconical taper sections of the fibers are fused together to provide optical coupling between the fibers. The fused fibers may also be twisted around one another to enhance mode mixing. The access couplers may be produced by fusing two fibers together along a small length, then heating the fused length and pulling the fibers to form the biconical tapers; or by twisting a portion of each of the fibers around one another, applying a tensile force to the twisted portions of the fibers and heating a region of the twisted fibers to soften and fuse a predetermined length of twisted fibers. If the fibers already have biconical taper sections, the access coupler may be produced by twisting the fibers together along their taper sections and heating a region of the taper sections to fuse them together.

REFERENCES:
patent: 3227535 (1966-01-01), Woodcock
patent: 4008061 (1977-02-01), Ramsay
patent: 4054366 (1977-10-01), Barnoski et al.
patent: 4083625 (1978-04-01), Hudson
Ozeki et al., "Tapered Section of Multimode Cladded Fibers . . . ", Appl. Phys. Ltrs., vol. 26, No. 7, Apr. 1, 1975, pp. 386-388.
Ozeki et al., "Optical Directional Coupler Using Tapered Sections . . . ", Appl. Phys. Ltrs., vol. 28, No. 9, 1 May 1976, pp. 528-529.
Yamamoto et al., "A Large-Tolerant Single-Mode Optical Fiber Coupler . . . ", Proc. of IEEE, Jun. 1976, pp. 1013-1014.
Barnoski et al., "Fabrication of an Access Coupler . . . ", Applied Optics, vol. 15, No. 11, Nov. 1976, pp. 2629-2630.

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