Fiber optic rotary joint
Fiber optic techniques make possible many useful devices for transmitting data with modulated light waves. In fiber optic waveguide transmission, rotary joints are required when there is a necessity to transmit optical signals between two turnable or rotatable members. Optical rotary joints enable communication between rotating and stationary systems employing optical fibers in such fiber optic communication systems. Fiber optic rotary joints are generally categorized as either an on-axis rotary joint in which the optical fibers that will communicate lie along the axis of rotation or an off-axis rotary joint in which the optical fibers do not lie along the axis of rotation, typically because the axis of rotation is inaccessible. A fiber optic rotary joint includes a housing that defines an internal cavity. The housing is adapted to engage end portions of two bundles of optical fibers, hereinafter referenced as the first and second bundles. Fiber optic rotary joints allow optical signals to be transferred between fibers located, respectively, on members that are rotating with respect to each other, such as where one member is rotating and the other member is stationary. Devices of this type are categorized as an on-axis rotary joint when the communicating optical fibers are located along the axis of rotation. Off-axis rotary joints generally include channel waveguides to direct the optical signal. Off-axis rotary joints generally include multiple optical sources, driven by one or more lasers, and multiple receivers in communication with respective channel waveguides.
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