Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-05-27
2000-12-26
Lee, John R.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022714, 25022717, G02B 634
Patent
active
061663727
ABSTRACT:
A polarization detection device includes a photocoupler; an optical waveguide layer for propagating light from the photocoupler therethrough; a polarization splitter for splitting the propagation light into two components having different refractive angles; and a photodetector formed of a semiconductor material for performing photoelectric conversion on the propagation light split into the two components. The photocoupler, the optical waveguide layer, the polarization splitter, and the photodetector are provided on a single semiconductor substrate. The photocoupler is one of a prism and a beam splitter formed of a dielectric material and supported by the optical waveguide layer only by an adhesive layer, the adhesive layer having a straight edge in the vicinity of the photocoupler. The adhesive layer has a thickness d fulfilling expression (1) where a longer diameter of a beam spot of the light incident on the photocoupler on an interface between the adhesive layer and the optical waveguide layer is L, and the angle of incidence of the light with respect to the optical waveguide layer is .theta.:
REFERENCES:
patent: 5220573 (1993-06-01), Sakata et al.
patent: 5946433 (1999-08-01), Yamamoto et al.
T. Isobe et al., Japanese Laid-Open Publication No. 5-101476, laid open on Apr. 23, 1993 with partial English translation.
H. Yamamoto et al., Japanese Laid-Open Publication No. 6-82644, laid open on Mar. 25, 1994 with English abstract.
M. Aoki et al., Japanese Laid-Open Publication No. 4-142503, laid open on May 15, 1992 with partial English translation.
Yamamoto Hiroyuki
Yoshida Yoshio
Conlin David G.
Lee John R.
O'Day Christine C.
Sharp Kabushiki Kaisha
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