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The effect of periodic strains in single-mode fibers, which lead to periodic changes of the relative index of refraction, is studied theoretically and experimentally. The main effect of the periodic strain is to downshift the beat length between the optical modes in the fiber.
It is demonstrated that light power may be converted from the guided LP(01) mode to the radiative LP(11) mode in single-mode optical fiber by using a periodic square-shaped distortion function. Coupling between these modes is measured directly as a function of distortion wavelengths and amplitudes for different optical wavelengths. The beating length… (More)