Investigation of the influence of an aperture stop on the signal/noise ratio in a single-fiber interference-type sensor

A study is reported of the ways of increasing the signal/noise ratio in a single-fiber interferometric pressure sensor utilizing an aperture stop as a component for filtering the contribution of modes to multibeam interference. It is shown that there is an optimal value of the aperture angle of the stop which ensures a high signal/noise ratio and a large amplitude of the signal from a pressure sensor utilizing a multimode optical waveguide.