Optical waveguides – With optical coupler – Movable coupler
Reexamination Certificate
1999-06-16
2001-06-12
Sanghavi, Hemang (Department: 2874)
Optical waveguides
With optical coupler
Movable coupler
C385S025000, C359S199200, C359S199200, C356S459000
Reexamination Certificate
active
06246810
ABSTRACT:
BACKGROUND OF THE INVENTION
Slip rings are used to transmit electrical signals across rotating joints. In conventional slip rings, the signals are carried across the rotating interface by precious metal alloys or composite brushes, which maintain contact with precious metal plated rings. Data transmission rates are limited by discontinuities at the contacts. Non-contact slip rings are used when higher data transmission rates are required which exceed the capability of the contacting slip rings.
SUMMARY OF THE INVENTION
An embodiment of the present invention is directed to an optical slip ring system for transferring information between a rotating frame and a stationary frame. The optical slip ring system includes a modulated light source, an optical fiber ring for receiving modulated light from the modulated light source and a signal conditioner for removing time variations in the transferred information. In one embodiment, the modulated light source is attached to the rotating frame. In that embodiment, the optical fiber ring is attached to the stationary frame. The optical fiber ring includes a first optical fiber and a second optical fiber. The first and second optical fibers each have a first and second end. In one embodiment, the first end of the first optical fiber is coupled to a first terminator and the second end of the first optical fiber is coupled to a detector. In that embodiment, the first end of the second optical fiber is coupled to a second terminator and the second end of the second optical fiber is coupled to the detector. The signal conditioner is coupled to the detector and restores data edges of the transferred information using an external clock. An advantage of the disclosed invention is that it reduces discontinuity in a received signal which allows for easier time delay correction of the received signal.
These and other features, advantages and objects of the present invention will be further understood and appreciated by those skilled in the art by reference to the following specification, claims and appended drawings.
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Barker Lee E.
Dorsey Glenn F.
Harris Michael H.
Vick Linda W.
Electro-Tec Corp.
Pak Sung
Price Heneveld Cooper DeWitt & Litton
Sanghavi Hemang
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