Abstract

Image restoration after a double pass through a multimode fiber using a polarization-preserving phase conjugator is demonstrated. Results indicate that the resolution of the restored image is limited by the number of guided modes and that the contrast is restored only when the phase conjugator preserves polarization on reflection.

© 1987 Optical Society of America

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References

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1987

1986

1985

B. Fischer, S. Sternklar, Appl. Phys. Lett. 46, 113 (1985).
[CrossRef]

1982

1976

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Figures (3)

Fig. 1
Fig. 1

Experimental setup used to demonstrate image restoration after a double pass through a multimode fiber by polarization-preserving phase conjugation. The image impressed upon the expanded argon-ion laser beam by transparency T is focused into a multimode fiber (MMF). Light leaving the MMF is reflected from the PPPC formed by the optical elements PBS, M3–M6, λ/2, and the BaTiO3 crystal. The effect of conjugating only one polarization component can be observed by blocking one of the output beams from the polarizing beam splitter PBS. After propagating back through the fiber, the restored image is sampled by beam splitter BS, analyzed by polarizer P, and photographed at the image plane.

Fig. 2
Fig. 2

Photographs demonstrating image restoration after a double pass through a multimode fiber by polarization-preserving phase conjugation. The first row of photos shows the input image patterns (a resolution chart and a gray-scale grid) impressed upon the laser beam, and the second row of photos shows the scrambled single-pass fiber output. The third and fourth rows show photographs, taken at the image plane in Fig. 1, of the image reconstructed by phase conjugation after a double pass through the multimode fiber. For the third row, the PPPC is at the fiber end, and for the fourth row, one of the outputs from the polarizing beam splitter in Fig. 1 is blocked to illustrate the effect of conjugating only one of the polarization components (NPPPC). Although the resolution is comparable for the two cases, the contrast is severely degraded in the case of the NPPPC.

Fig. 3
Fig. 3

Photographs demonstrating image restoration after a double pass through a multimode fiber by polarization-preserving phase conjugation for a low-detail image and for a high-detail image. The input image and the image reconstructed by phase conjugation after a double pass through the multimode fiber are photographed for both PPPC's and NPPPC's. Degradation of image contrast is so severe for the image reconstructed by the NPPPC that the picture of the high-detail image is barely discernible.

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