The mode analysis of signals in a multimodal shallow harmonic waveguide whose eigenfrequencies are equally spaced and finite can be performed by an optoelectronic device, of which the optical part uses the guide to sample the wave field at a number of sensors along its axis and the electronic part computes their fast Fourier transform. We illustrate this process with the Kravchuk transform.
© 2000 Optical Society of America
(070.1170) Fourier optics and signal processing : Analog optical signal processing
(070.2590) Fourier optics and signal processing : ABCD transforms
(070.6020) Fourier optics and signal processing : Continuous optical signal processing
(200.1130) Optics in computing : Algebraic optical processing
(230.7390) Optical devices : Waveguides, planar
Tatiana Alieva and Kurt Bernardo Wolf, "Finite mode analysis through harmonic waveguides," J. Opt. Soc. Am. A 17, 1482-1484 (2000)