Fibre Optic Rotational Interfaces

In many fibre optic telemetry applications, it is necessary to pass the optical signals through a rotating interface. Devices to achieve this are commonly known as Fibre Optic Rotary Joints. Various methods of achieving data integrity through the rotating interface are discussed. Consideration is given to methods best suited to each of a variety of applications. The most versatile is seen to be the optical rotary joint. Design considerations are presented for optical rotary joints providing one or more optical passes. The design evolution of a particular rotary joint configuration is discussed. A second method is presented, offering an alternative approach. Miniaturization and operation with singlemode fibre optic systems is suggested as an area for future development.