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We present a novel design for quadrature phase detection utilizing two-mode optical waveguides for optical interferometric systems. A pair of interferometric signals having quadrature optical phase information can be obtained from the near-field and far-field patterns of a two-mode waveguide output. The operational principle is based on a 7r/2 differential phase shift between two modal beams occurring during their transition from near-field to far-field radiation patterns.doi:10.1364/ol.14.001380 pmid:19759689 fatcat:2gw42iixnbcyrghmwkztifldjm