G - Physics – 02 – B
Patent
G - Physics
02
B
88/97.2, 363/1.8
G02B 6/12 (2006.01) G02B 6/124 (2006.01) G02B 6/34 (2006.01) H01J 15/00 (2006.01)
Patent
CA 1262580
ABSTRACT A thin-film waveguide lens and a planar wavelength division multiplexer/demultiplexer compatible with integrated optics technology and embodying such lens are disclosed. The thin film lens comprises a thin-film waveguide with completely homogeneous materials and no physically produced graded index regions, in rectangular shape. A plano-convex overlay layer integral with the waveguide extends the entire length and width of the waveguide along the axis, its thickness profile being selected so as to simulate a graded effective refractive index in the waveguide in order to collimate focussed rays and focus collimated rays entering at one end plane for substantially collimated or focussed arrival at the other end plane. The multiplexer/ demultiplexer comprises the above thin-film waveguide lens, with one of the end planes constituting an entrance/exit plane for receiving optical fibers in an abutting connection, and the other end plane bearing a diffraction/reflection grating In accordance with the preferred embodiments, the shape of the plano-convex overlay is such as to provide an effective index of refraction profile in the waveguide according to the formula n = nosech(gx), where n is the effective refractive index at the distance x from the axis of the waveguide, no is the effective refractive index at the waveguide axis, and g is a constant equal to .pi./2f, where f is the focal length of the lens, being essentially the distance between end planes.
488461
Hewak Daniel W.
Lit John W.y.
Armstrong R. Craig
Hewak Daniel W.
Lit John W.y.
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