Optical waveguides – Directional optical modulation within an optical waveguide – Acousto-optic
Patent
1999-04-20
2000-11-21
Sanghavi, Hemang
Optical waveguides
Directional optical modulation within an optical waveguide
Acousto-optic
385 28, 385 29, G02F 1335
Patent
active
061514276
ABSTRACT:
The present invention is a tunable optic fiber bandpass filter using flexural acoustic waves that includes an optic fiber; a first silica horn; a first acoustic transducer; a first signal generator; a first acoustic absorber; a core blocker; a second acoustic absorber; a second silica horn; a second acoustic transducer; and a second signal generator. The method of the present invention is receiving an optic signal in a core of an optic fiber; inducing a first flexural acoustic wave in the optic fiber where there is no buffer coating; absorbing the first flexural acoustic wave after it has traveled a distance down the optic fiber; causing user-definable wavelengths of the optic signal to exit the core and enter the cladding of the optic fiber; blocking wavelengths of the optic signal that remain in the core of the optic fiber; inducing a second flexural acoustic wave in the optic fiber where there is no buffer coating; absorbing the second flexural acoustic wave after it has traveled a distance down the optic fiber; and causing user-definable wavelengths of the optic signal to exit the cladding and enter the core of the optic fiber. One signal generator may be used to induce both flexural acoustic waves. In an alternate embodiment, one absorber may be used.
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Morelli Robert D.
Sanghavi Hemang
The United States of America as represented by the National Secu
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