Optical waveguides – Planar optical waveguide
Patent
1992-07-30
1993-12-07
Gonzalez, Frank
Optical waveguides
Planar optical waveguide
385 14, 385 37, 359 34, G02B 610
Patent
active
052689859
ABSTRACT:
A light-guiding device having a light-incident surface and a light-outgoing surface for guiding light incident from the light-incident surface from the light-outgoing surface toward a light-receiving surface of a photodetector for generating an electric signal corresponding to a quantity of the received light. The device comprises a hologram layer having an interference pattern which acts as a diffraction grating to diffract and reflect the light, incident from the light-incident surface, in a predetermined direction. The hologram layer is interposed between first and second total reflection layers. The first total reflection layer has a first total reflection surface disposed in opposed relation to one of the longitudinal surfaces of the hologram layer so that the light diffracted and reflected by the hologram layer is incident on the first total reflection surface at a predetermined angle larger than the critical angle so as to be total-reflected thereon, and the second total reflection layer has a second total reflection surface disposed in opposed relation to the other longitudinal surface of the hologram layer so that the incident light passing through the hologram layer is incident on the second total reflection surface at a predetermined angle greater than the critical angle so as to be total-reflected thereon. This arrangement improves the light-receiving performance concurrently with reducing the thickness of the device.
REFERENCES:
patent: 4662711 (1987-05-01), Tada et al.
patent: 4866694 (1989-09-01), Korth
patent: 5082339 (1992-01-01), Linnebach
"Edge-Lit Rainbow Holograms" by Stephen A. Benton et al; SPIE, vol. 1212 Practical Holography IV(1990); Jan. 18, 1990; pp. 149-157.
Ando Hirosi
Namba Shinji
Gonzalez Frank
Nippondenso Co. Ltd.
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