DISTRIBUTED FEEDBACK DEVICES WITH PERTURBATIONS DEVIATING FROM UNIFORMITY FOR VING MODE DEGENERACY

摘要

DISTRIBUTED FEEDBACK DEVICES WITH PERTURBATIONS DEVIATING FROM UNIFORMITY FOR REMOVING MODE DEGENERACY Distributed feedback devices such as distributed feedback lasers are modified by introduction of a central coupling strength discontinuity or other deviation from uniform nature of the distributed perturbations, in order to promote the transmission or oscillation of a single mode in preference over the nearest redundant modes. The class of deviations from uniform coupling strength may be mathematically termed antisymmetric deviations, because they are deviations about the midpoint of the perturbation pattern which result in a distinction of effect of the two halves of the pattern, taking either half as a reference pattern by itself.