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Onion Light Waveguides for Circuit Interconnections

IP.com Disclosure Number: IPCOM000108581D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 32K

Publishing Venue

IBM

Related People

Batchelder, JS: AUTHOR

Abstract

A hemispherical waveguide provides a multitude of fast, isolated optical interconnects of distant points on a semiconductor wafer. A 200 mm diameter hemisphere of LiNbO sub 3 diffused with titanium forms a waveguide composed of a sequence of concentric spherical layers. The layers repeat a sequence of absorber, cladding, waveguide, cladding, absorber, etc. Radial separation between waveguides is 100 microns yielding approximately 2,000 waveguide layers.

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Onion Light Waveguides for Circuit Interconnections

       A hemispherical waveguide provides a multitude of fast,
isolated optical interconnects of distant points on a semiconductor
wafer. A 200 mm diameter hemisphere of LiNbO sub 3 diffused with
titanium forms a waveguide composed of a sequence of concentric
spherical layers. The layers repeat a sequence of absorber, cladding,
waveguide, cladding, absorber, etc. Radial separation between
waveguides is 100 microns yielding approximately 2,000 waveguide
layers.

      In the figure, a hemispherical waveguide 1 is mounted on a
silicon substrate 2 connected by standard multi-level interconnects 3
and 4.  Optical emitter 5 and receiver 6 are positioned at
diametrically opposite points of each waveguide hemisphere.  Logic
circuits 7 and 8 further interconnect and support the emitters 5 and
receivers 6. Injected light from emitter 5 will thereby be focussed
on detector via waveguide 1.  Each waveguide hemisphere can carry
many simultaneous signals as the light can be focussed to a .2 micron
spot giving a possible 1.57 million interconnects with 200 mm
diameter waveguide.