We propose to determine the optical field in multimode circular fibers by using a one-step method that measures the Wigner distribution function of a section of the field in the fiber. This method allows an estimation not only of the power carried by each mode but also of the relative phases of different modes in the fiber. An additional measurement with the same setup can even determine the propagation constants of different modes. An example is provided, and the connection of this method of field recovery to the coupling coefficient between fibers and light sources is also discussed.
© 2001 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2300) Fiber optics and optical communications : Fiber measurements
(100.0100) Image processing : Image processing
(100.3010) Image processing : Image reconstruction techniques
Daniela Dragoman and Jean-Pierre Meunier, "One-Step Measurement of Optical Fields in Multimode Circular Fibers," Appl. Opt. 40, 4655-4660 (2001)