Patent
1976-08-02
1978-10-03
Corbin, John K.
350 382, 350 9630, 350162SF, G02B 514
Patent
active
041181069
ABSTRACT:
An arrangement for correcting the phase redistribution of a wave occurring in transmission through fiber optics is disclosed. The phase redistribution occurring as a result of the differences in length between the individual optical fibers is corrected by means of a hologram used as a corrector plate positioned in contact with the exit face of the bundle, with this hologram being produced by combining a reference beam with the output wave produced from an input plane wave. The phase redistribution occurring within individual fibers introduced by transmission of an incident object field exciting differing modes is corrected by the use of a second holographic correction plate placed at a plane which displays the Fourier transform of the output field at the output of the fiber bundle. This hologram is produced by an input wave form which excites each of the various modes in the fibers and passing the output transmitted through the fiber optic through a lens and recording the hologram at the back focal plane. This second corrector plate is disclosed as allowing resolution of an input image better than the fiber size.
REFERENCES:
patent: 3435244 (1969-03-01), Burckhardt et al.
patent: 3759590 (1973-09-01), Arnaud
patent: 3832030 (1974-08-01), Gloge
patent: 3872293 (1975-03-01), Green
patent: 3980391 (1976-09-01), Stewart
Krusos, "Restoration . . . by Optical Spatial Filtering," Optical Engineering, vol. 13, No. 3, May/Jun. 1974, pp. 208-218.
Alferness, "Phase Correction in . . . ," Optics Communications, vol. 12, No. 2, Oct. 1974, pp. 152-155.
Corbin John K.
Environmental research Institute of Michigan
Lee John D.
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