Optical waveguides – With optical coupler – Input/output coupler
Patent
1994-06-17
1995-05-30
Lee, John D.
Optical waveguides
With optical coupler
Input/output coupler
359569, 385 36, 385129, G02B 634
Patent
active
054209471
ABSTRACT:
A device for achromatic input coupling of an optical beam into a waveguide is disclosed. The device includes a waveguide formed of a material having an effective index of refraction and having first and second surfaces, such waveguide defining a guided mode of propagation. A first grating is provided at the interface at the first surface of the waveguide, such first grating being selected so as to diffract an optical beam at an appropriate angle selected so that the beam is coupled into the guided mode of the waveguide. A second waveguide is provided at the interface at the second surface of the waveguide, such second grating selected so as to diffract a beam to provide an appropriate angle of incidence onto the first grating at the first surface waveguide. An important aspect of the present invention is the use of linear dispersion of the gratings to cancel the linear portion of the sum of the intrinsic waveguide dispersion and the material dispersions of the waveguide and the prism.
REFERENCES:
patent: 5010458 (1991-04-01), Fraizer et al.
patent: 5044718 (1991-09-01), Kando
patent: 5101458 (1992-03-01), Spaulding et al.
Hetherington et al, Dispersion Compensation for an Integrated Optic Grating Coupler Utilizing a Transmission Volume Hologram, App. Opt. 32, 303-308, 1993 (Jan.).
Gupta et al, Achromatic Compensation for Integrated Optic Grating Couplers With Focused Beams, Appl. Opt. 30, 1461-1463, 1991(Apr.).
Jannson et al, Broad-Band Single-mode Coupler, Proc. OSA Annual Meeting, San Jose Nov. 4, 1991, Paper MY5.
Kando et al, An Integrated Optical Pick-up With Small Wavelength Abberations, Int. Symposium on Optical Memory, IC-5, Sapporo, 1992, 2 pp.
Brazas, Jr. John C.
Li Lifeng
Eastman Kodak Company
Lee John D.
Owens Raymond L.
University of Arizona
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