Intermodal Pattern Modulation In Optical Fiber Modal Domain Sensor Systems: Experimental Results

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Abstract
Interference between the modes of an optical fiber results in specific intensity patterns which can be modulated as a function of disturbances in the optical fiber system. These modulation effects are a direct result of the difference in propagation constants of the constituent modes. In a companion paper, a detailed theoretical analysis of the modal phenomena responsible for the far field intensity pattern modulation of various few-mode (V 5.0) modal domain sensor systems is presented [1]. This paper will present experimental results which verify the expected system behavior and which serve as proof of the significance of the modal domain sensing technique in general. The results of both static and dynamic strain measurements are presented, as are data which demonstrate the strain sensitivities achievable with modal domain sensor systems. System linearity and dynamic range are also considered.

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