De-rotating mechanism for off-axis fiber optic rotary joint
a technology of rotary joints and optical fibers, applied in the field of optical communication apparatuses, can solve the problems of inability to use off-axis fiber optic rotary joints, inability to focus multiple optical signals onto the relatively small active area, and conventional optical de-rotating mechanisms like dove prisms
Active Publication Date: 2018-03-29
PRINCETEL
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Benefits of technology
Problems solved by technology
Unfortunately, the conventional optic de-rotating mechanism like Dove prism, cannot be used for off-axis fiber optic rotary joints.
The increased ratio of the fiber diameter to photodiode area makes it more difficult to focus multiple optical signals onto the relatively small active area.
Method used
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[0017]Dove prisms are widely used to invert an image. FIG. 1 is the schematic drawing of a Dove prism in the prior arts. The image 2 of an object 1 is inverted by the Dove prism 10. When Dove prism rotates along its longitudinal axis 3, the transmitted image 2 rotates at twice the rate of the Dove prism 10. Therefore, if the object 1 is rotating and Dove prism 10 rotates at half the speed of the rotating object 1, the image 2 after passing through the prism, will be stationary. In an on-axis fiber optic rotary joint, the object 1 is a fiber optic collimator fixed on a rotor, and the Dove prism is fixed on a holder, which will rotates at half the speed of said rotor. The image 2 is another fiber collimator fixed on stator, which is optically aligned with the image 2 position. So, the optic signal from said fiber collimator on said rotor can be transmitted into said fiber collimator on said stator, as long as said Dove prism holder rotates at half the speed of said rotor. Vice versa. ...
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The current invention is to disclose a de-rotating mechanism for off-axis fiber optic rotary joints. Dove prism is a de-rotating mechanism and is widely used for on-axis fiber optic rotary joints. But optic de-rotating mechanism is not available when there is a through bore along the rotational axis and optical light paths would not be allowed to path through the central area along the rotational axis. The hollow de-rotating mechanism in the current invention mainly includes a plural of fiber optic collimator patch cords, which are elaborately arranged on the circumference of said de-rotating mechanism following a special rule. The current invention eliminates the photodiodes in most prior published patents and make it possible to build a true passive, bi-directional fiber optic rotary joint without the limitation to the through bore diameters.
Description
BACKGROUND OF THE INVENTIONField of the Invention[0001]The invention is related generally to the field of apparatus for fiber optic communication, and more particularly, off-axis fiber optic rotary joint to provide transmission of optic data between a mechanically rotational interfaces with a through bore.Description of Related Art[0002]It is well known that the devices to transmit optical data between two independently rotational members are called fiber optical rotary joints. A typical fiber optical rotary joint consists of a fixed fiber collimator holder and a rotatable fiber collimator holder which are relatively rotatable each other to allow transmission of optical signals through the rotational interface from fiber collimators on any one of the holders to the fiber collimators on another holder. There are single channel, two channel and multi-channel fiber optical rotary joints.[0003]The multi-channel fiber optic rotary joints of prior arts typically utilize an optic de-rotati...
Claims
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IPC IPC(8): G02B6/36G02B6/32
CPCG02B6/3604G02B6/32
Inventor ZHANG, HONGZHANG, BOYING B.
Owner PRINCETEL