Vibration frequency of a fused biconical taper (FBT) lightwave coupler

A simple formula for the assessment of the lowest frequency of free lateral vibrations of fused biconical taper (FBT) lightwave coupler, subjected to initial tensile strain (force), is proposed. This formula can be used to determine the initial tensile strain that would result in a sufficiently high vibration frequency and at the same time would be acceptable from the standpoint of the long-term reliability of the material. The obtained formula can be applied also for the evaluation of the initial tensile force, stress and strain from the measured frequency of vibrations.<
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