Optical fiber transmission compensator

Details Optical fiber transmission compensator Optical fiber transmission compensator

1975-04-17

1976-09-14

Corbin, John K.

350 96GN, 350175GN, G02B 514

Patent

active

039803910

ABSTRACT:
In an optical fiber, light energy is transmitted in a number of modes having characteristic group velocities, and it is frequently necessary to limit transmission to modes whose group velocities are not excessively disparate. The invention avoids this limitation by providing a compensator (preferably) midway between two stations. The compensator pairs a fast mode in a fiber leading to one of the stations with a slow mode in a fiber leading to the other station, so that the group velocities for all pairs are approximately equal. The compensator comprises first, second and third focusing systems which are aligned with the fiber ends.
The first system focuses energy received from one fiber into concentric rings whose radii are characteristic of the modes used in the fiber. The second system transposes, to a ring of maximum radius, energy focused at a ring of minimum radius, and vice versa. The third system delivers transposed energy to the other fiber in modes determined by the radii of the rings to which the energy has been transposed.

REFERENCES:
patent: 3687514 (1972-08-01), Miller et al.
patent: 3759590 (1973-09-01), Arnaud
patent: 3829195 (1974-08-01), Rawson
patent: 3831038 (1974-08-01), Dabby et al.
patent: 3832030 (1974-08-01), Gloge

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