Optical waveguides – With optical coupler – Particular coupling structure
Patent
1996-04-10
1998-08-04
Palmer, Phan T. H.
Optical waveguides
With optical coupler
Particular coupling structure
385 31, 385 45, 385 20, G02B 626
Patent
active
057907293
ABSTRACT:
The integrated multimode optical coupling apparatus comprises an N-to-M optical coupling arrangement that is simple to manufacture, minimizes optical losses and is significantly less expensive than the prior art arrangements of coupling optical signals. The preferred embodiment of the apparatus of the present invention comprises a substrate into which is formed a plurality of optical channels, each of which is joined at one end into a single output optical channel. This integrated optical coupler is formed by diffusing silver ions or other equivalent ions into the glass substrate in these defined areas to form channels of high optical refractive index in the body of the substrate. At one end of each of the optical channels that are formed in the substrate, the plurality of the optical channels are joined together in a volumetric region of the substrate wherein the individual channels merge into one unified common structure. The output optical channels are joined to this combiner to thereby carry the combined light output to the output terminals. One application of this apparatus is in the field of photoplethysmography, such as in a pulse oximeter instrument.
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Pologe Jonas A.
Yang Shao
Ohmeda Inc.
Pace Salvatore P.
Palmer Phan T. H.
Rathbun Roger M.
Schoneman William A.
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