We calculate the radiation loss of a helically deformed optical fiber. Instead of treating the infinite, periodical structure, only one turn of the helix is considered. We find that the loss formula for the helix agrees with the well known curvature loss formula for a circularly deformed fiber if the radius of curvature of the circle is replaced by the radius of curvature of the helix.
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D. Marcuse (1976) studied this question.
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