Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Patent
1993-04-14
1995-05-16
Bovernick, Rodney B.
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
385 8, G02B 610
Patent
active
054168597
ABSTRACT:
A broadband, electrooptic modulator is disclosed which, in a first embodiment, comprises: a substrate having substrate modes, having electrooptic effects, and having a first optical waveguide adapted to receive and transmit light therethrough in a first direction and with a first phase velocity; a buffer layer disposed on the substrate; and a coplanar waveguide electrode structure having a coplanar mode and being disposed on the buffer layer for receiving an electrical signal propagating therethrough in the first direction with a second phase velocity to phase modulate the light in the optical waveguide at a frequency in the range from 0 Hz up to substantially 40 GHz. The substrate has a sufficiently small thickness so that coupling between the coplanar mode of the coplanar waveguide electrode structure and any one of the substrate modes of the substrate substantially does not occur over a desired frequency bandwidth of operation, and the coplanar waveguide electrode structure has a sufficiently large thickness so that the second phase velocity of the electrical signal is substantially equal to the first phase velocity. In a second embodiment of the invention an intensity modulator is produced by adding a second optical waveguide which, in combination with the first optical waveguide, forms an interferometer.
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C. H. Bulmer et al., "Broadband, Traveling Wave Phase An Amplitude Modulas For Photonics Applications", presented at 2nd Annual Darpa/Rome Laboratory Symposium On Photonics Systems For Antenna Applications, Naval Postgraduate School, Monterey, Calif. Dec. 10-12, 1991.
Gopalakrishnan et al., "Electrical Loss Mechanisms In Traveling Wave LiNbO.sub.3 Optical Modulators", printed in Electronics Letters, vol. 28, No. 2, Jan 16, 1992, pp. 207-209.
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Bulmer Catherine H.
Burns William R.
Gopalakrishnan Ganesh K.
Bovernick Rodney B.
Jameson George
McDonnell Thomas E.
Ngo John
The United States of America as represented by the Secretary of
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