Optical waveguides – Directional optical modulation within an optical waveguide – Acousto-optic
Patent
1997-05-21
1998-11-24
Ngo, Hung N.
Optical waveguides
Directional optical modulation within an optical waveguide
Acousto-optic
385 43, 385 28, 385 8, 385 2, G02B 610
Patent
active
058419136
ABSTRACT:
An exemplary embodiment of an acousto-optic planar waveguide modulator includes a planar waveguide structure with an input section connected to a multimode section connected to an output section. The input and output sections have structures for propagating an optical signal in a first transmission mode. The multimode section has a structure in which an optical signal can propagate in the first transmission mode and a second transmission mode. A surface acoustic wave source is used to direct a surface acoustic wave at the multimode waveguide section to cause a periodic change in the refractive index for coupling optical signal energy between the even and odd transmission modes. As a consequence, power of an optical signal propagating in the even transmission mode is transferred to the odd transmission mode. This power transfer causes an attenuation of the optical signal propagating in the even transmission mode from the multimode section to the output section. Such attenuation can be varied in accordance with a second signal to modulate the optical signal by correspondingly varying the surface acoustic wave energy to produce a modulated optical signal. Further embodiments modulate optical signals propagating in single mode waveguides having their transmission modes evanescent field coupled to respective transmission modes of the planar multimode waveguides.
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D. Marcuse, Light Transmission Optics, ch. 8, p. 327 (Van Nostrand Reinhold Co., N.Y., 1992).
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Marcuse Dietrich
Presby Herman Melvin
Lucent Technologies - Inc.
Ngo Hung N.
Rudnick Robert E.
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