MULTIPORT OPTICAL WAVEGUIDE INTERFEROMETER AND METHOD OF MAKING THE SAME

摘要

A multiport optical waveguide interferometer is provided which comprises at least two NxN couplers arranged in series on an array of fibers and separated by a short region such that the phase shift between the couplers is approximately equal to pi . A method for making such interferometer comprises forming such couplers, for instance by a fused taper method with appropriate twist, where the fused, tapered and twisted zone is longer than usual and wherein the couplers are formed in series within such zone, separated by short regions of between 1-2 mm, and adjusted to achieve the flattest possible wavelength response.