Polarized-wave-dispersion- preventive optical fiber and its manu

Details Polarized-wave-dispersion- preventive optical fiber and its manu Polarized-wave-dispersion- preventive optical fiber and its manu

1996-05-24

1997-12-23

Palmer, Phan T. H.

Optical waveguides

Optical fiber waveguide with cladding

385121, 65432, G02B 602, G02B 616

Patent

active

057013764

ABSTRACT:
An optical fiber comprises a core line, which includes a core and a cladding, and a cover. The core line is twisted 90.degree. clockwise and counterclockwise alternately at predetermined intervals (for example, every 30 meters). The twisted portion in the core line is equal to or shorter than 1 m, and is more preferably only several centimeters long. Since the optical fiber has residual birefringence, there exist two principal axes of birefringence, that is, a fast axis f and a slow axis s in the core line. Since the core line is 90.degree. twisted at the twisted portion, the two principal axes of the consequent portion exchange their direction compared with the two principal axes of the antecedent portion. Thus, twisting the core line effectively shortens the sustaining distance of the birefringence of the optical fiber, and exchanging the directions of the two principal axes successfully suppresses the polarized wave dispersion.

REFERENCES:
patent: 4962994 (1990-10-01), Someda

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