WHAT IS A FIBRE OPTIC ROTARY JOINT?

WHAT IS A FIBRE OPTIC ROTARY JOINT?

A Fibre optic Rotary Joint is equivalent to an electrical slip ring but in the domain of optics and is mostly used as a co-existing element along with slip rings. Fibre optic Rotary Joint (FORJs) are available in single and multi-channel forms and have a special characteristic of having unlimited reach.To get more news about fiber optic rotary joint, you can visit grandslipring.com official website.

A Fibre Optic Rotary Joint (FORJ) is a device allowing a light or optic signal to be transferred across the interface between a stationary support structure and its continuously rotating platform. The FORJ applications have multiplied with the increasing adoption of fiber optic joints for communication transmission.

Examples:
FORJ’s are used in a plethora of applications like radar pedestals, wind turbines, as well as electro-optic sensors, have implemented fiber optic rotary joints to take care of optical signals simultaneously with slip rings to handle electrical power and signals.

Passive FORJs is responsible for transferring an optical signal between the rotating and stationary structure without the support of electronic processing with the help of elements like filters and lenses that can be used to interpret the optical signal.

Active FORJs uses the principle of electronics to process the signal to positively influence rotor to stator transmission properties and involves electrical/ optical conversions, amplification, etc.

An example of the implementation of the active FORJ can be the medical CT scanner which can be used to carry high-speed image data from the rotating X-ray detectors to the stationary data processors.

Single-pass FORJs are rotary joints where a single fiber enters the FORJ from one of the sides of the rotating assemblage making the optical signals combined between them as one fiber rotates relative to the other. It follows the basic principle of magnifying the diameter of the coupled light by the use of lenses, bundles, or large diameter fiber.

However, the most common approach used here is the usage of lenses to extend the optical beam leading to minimizing the effects of mechanical misalignment.

Implementation: Single-pass FORJs are used primarily for digital data transmission and has been commercialized using the general design philosophy of multimode fiber. FORJs also follows the rule of directly combining the light across the gap without lenses. This is possible by the significantly greater core size of the Plastic Optical Fibre (approx.1.0 mm) which makes tolerances at all combining sites, including connectors, less critical. The success of Plastic Optical Fibre FORJ technology has its use in industrial applications, with the basic limitation being difficult to operate over shorter distances.

In such kinds, anti-reflective coatings are used on both the ends of the GRIN lenses to reduce reflections and remarkably improve the returned loss of the FORJ simultaneously improving the insertion loss to a lesser degree.

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