Optical waveguides – With optical coupler – Particular coupling structure
Patent
1993-04-06
1995-10-17
Ullah, Akm E.
Optical waveguides
With optical coupler
Particular coupling structure
385 43, 385 46, 385 48, 385114, 385126, G02B 626
Patent
active
054598044
ABSTRACT:
The invention is a fiberoptic coupler formed by multiple optical fibers each having a core and a surrounding cladding and at least one spacer fiber having the refraction index substantially matched to the refraction index of the cladding of at least one adjacent optical fiber. The optical and spacer fibers are arranged, over a region extending axially through a limited length coupling region, in a side-by-side configuration wherein each fiber touches neighboring fibers. The coupling region is created by laterally fusing all fibers and is adapted to couple propagating modes of light between the optical fibers. Various configurations of the coupler include an arrangement of seven equal diameter fibers with a center fiber surrounded by six fibers, or an arrangement of nineteen equal diameter fibers with a center fiber surrounded by a first ring of six close-packed fibers and a second ring of twelve close-packed fibers. The number of the optical fibers and spacer fibers and their relative arrangements are selected to achieve desired properties of the coupler such as a number of optical input and output fibers, the coupling ratio or wavelength dependent coupling.
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Porta Systems Corporation
Sanghavi Hemang
Ullah Akm E.
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