Optical coupler and method of manufacturing

Details Optical coupler and method of manufacturing Optical coupler and method of manufacturing

1992-04-30

1993-06-22

Lee, John D.

Optical waveguides

With optical coupler

Particular coupling structure

385 39, 385 42, G02B 626

Patent

active

052221679

ABSTRACT:
An optical coupler with an input and 2.sup.n outputs comprises a plurality of substantially coplanar waveguides, each optically coupling said input to one of said 2.sup.n coupler outputs, said waveguides comprising a plurality of waveguide sections connecting n stages of Y-junctions disposed along each waveguide path in a tree and branch arrangement, and further comprises a first junction (J.sub.21), having an axis not parallel to that of said coupler, which is connected to two second junctions (J.sub.31, J.sub.32) by curved waveguide sections without singularities, wherein any inflection point along any one of the waveguides, between the input and the nth stage of the junctions, is situated at one of the n junctions along the waveguide path. The coupler may be successfully applied to splitters or combiners and carried out in integrated optics, and a method for designing the mask used in the manufacture of the integrated optics coupler is also described.

REFERENCES:
patent: 4232385 (1980-11-01), Hara et al.
patent: 4760580 (1988-07-01), Thompson et al.
Voirin, et al., "Performances of an Ion Exchanged Star Coupler for Multimode Optical Communications", pp. 229-231, in "Integrated Optics--Proceedings of the 3rd European Conference, ECIO '85, Berlin, Germany, May 6-8, 1985" published by Springer-Verlag, Berlin/New York.
Nourshargh et al., "Integrated Optic 1.times.4 Splitter in SiO.sub.2 /GeO.sub.2 ", Electronics Letters, vol. 25, No. 15, Jul. 20, 1989, pp. 981-982.
Becker et al., "Low-Loss Multiple-Branching Circuit in Ti-Indiffused LiNbO.sub.3 Channel Waveguides", Optics Letters, vol. 9, No. 6, Jun. 1984, pp. 246-248.

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