Abstract
AbstractTo clarify the basis of the concept of effective cutoff wavelength useful for design of single mode optical fibers, this paper discusses theoretically and experimentally the mode conversion effect due to fluctuation of the fiber structure in addition to the difference of the attenuation constants of the modes. In the two‐mode region, the scattering matrix elements of the optical fiber are measured with respect to the power of the LP01 and LP11 modes. Based on the measurement, the wavelength dependence of the mode conversion coefficient h and the mode attenuation αi are determined.Next, the multimode dispersion and excess loss of the two‐mode system with mode conversion are related to the parameters h and αi and the significance of the effective cutoff wavelength is discussed. It is found that at frequencies slightly beyond the theoretical cutoff for the measured sample fiber the difference of attenuation constants of two modes is substantial. In addition, since the mode conversion coefficient is small, the degradation of the transmission characteristics due to the higher order mode is reduced, resulting in the effective single mode transmission line. Also found is the condition to be satisfied by h and αi so that the desired transmission characteristics (dispersion and loss) are realized with a necessary length of fiber.
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