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 π/2 differential phase shift between two modal beams occurring during their transition from near-field to far-field radiation patterns.
© 1989 Optical Society of America
Original Manuscript: June 26, 1989
Manuscript Accepted: October 6, 1989
Published: December 15, 1989
S. Y. Huang, H. G. Park, and B. Y. Kim, "Quadrature phase detector using two-mode waveguides," Opt. Lett. 14, 1380-1382 (1989)