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Coherent, Single-Mode Fiber Optic For Multifunction 10.6 µm Helicopter Avionics System

The expansion of electro optic systems and sensors in military helicopter avionics systems has resulted in severe competition for existing space. In particular the forward looking hemispherical quadrant is the essential location of choice for all such optical systems. Outboard mounting is severly limited by shadowing effects and the aircraft undercarriage is similarly limited by the nose low aspect in normal helicopter flight. Development of a fiber optic capable of transmitting 10.6u in a coherent single mode with an acceptable transmission loss promises to minimize the physical space required in the nose of aircraft and thereby provide extended functional use of the clear field of view. The requirements for such a fiber optic system are presented and a projected application is described.