Method of creating an index grating in an optical fiber and a mo

Details Method of creating an index grating in an optical fiber and a mo Method of creating an index grating in an optical fiber and a mo

1991-12-20

1993-06-01

Ullah, Akm E.

Optical waveguides

Optical fiber waveguide with cladding

385125, 359566, G02B 612, G02B 614

Patent

active

052167399

ABSTRACT:
Efficient, narrow-band rocking filters have been made in polarization-maintaining monomode optical fiber by photoinducing periodic birefringent gratings along the length of the fiber. These gratings, fabricated with a period chosen to provide synchronous coupling between the two principal states of polarization of the LP.sub.01 mode at a preselected wavelength, gently rock to and fro the principal polarization axes of the fiber. To photoinduce the grating, the fiber is exposed periodically along its length to a U.V. light beam which is incident at right angles to the geometrical axis of the fiber and is directed .pi./4 radians with respect to the principal axes. Efficient polarization mode conversion at 1.3 .mu.m with the fiber gratings are obtained.

REFERENCES:
patent: 4725110 (1988-02-01), Glenn et al.
patent: 4807950 (1989-02-01), Glenn et al.
patent: 4974930 (1990-12-01), Blyler, Jr. et al.
patent: 5104209 (1992-04-01), Hill et al.

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