Acousto-optic modulator for optical fibers using Hertzian contac

Details Acousto-optic modulator for optical fibers using Hertzian contac Acousto-optic modulator for optical fibers using Hertzian contac

1989-01-17

1991-02-12

Lee, John D.

350 9614, 350 9629, G02B 626

Patent

active

049919237

ABSTRACT:
An acousto-optic device which is incorporated into a fiber optic system to define, based upon device configuration, an element such as a phase modulator, optical tap, frequency shifter or mode coupler. The device comprises an acoustic transmission member having a groove therein which is secured in the Hertzian contact along a continuous portion of its surface with an optical waveguide so as to communicate acoustic signals from a transducer affixed on the member through the Hertzian contact area and into the optical waveguide. In one preferred embodiment the member comprises a capillary tube having a bore that is substantially the same diameter as the optical waveguide to which the device is to be affixed. A portion of the capillary tube is removed to expose the base, thereby defining a groove along the capillary substrate. In one preferred embodiment an acoustic transducer is deposited on the curved surface opposite the groove to focus acoustic signals from the transducer toward the groove. In another preferred embodiment, a portion of the capillary substrate opposite the groove is lapped to form a substantially flat surface which is parallel to the plane of the groove. An acoustic transducer is then deposited on the flat surface. The capillary substrate may also be lapped to form a wedge configuration for launching acoustic waves at an angle with respect to the groove. The optical waveguide is pressed into the groove to form the Hertzian contact with the groove.

REFERENCES:
patent: 4735476 (1988-04-01), Heffner et al.
patent: 4735485 (1988-04-01), Shaw et al.

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