Birefringent fiber narrowband polarization coupler and method of

Details Birefringent fiber narrowband polarization coupler and method of Birefringent fiber narrowband polarization coupler and method of

1988-02-22

1989-01-31

Sikes, William L.

350 9629, 350 9630, 350320, 350371, G02B 626, G02B 530

Patent

active

048011894

ABSTRACT:
There is disclosed herein a fiber optic directional coupler for coupling light between two polarization modes. A highly birefringent fiber optic waveguide is positioned on a flat polished surface with either of the principal axes of birefringence oriented at an angle, preferably 45.degree., to the vertical. A ridged block is then pressed down on the fiber. The ridges of the block have longitudinal axes transverse to the longitudinal axis of the fiber. The width of the ridge faces is one-half beat length, and the spacing between the ridges in also one-half beat length. The stressed regions caused by the ridges cause coupling of light traveling in one polarization mode into the other polarization mode by abrupt shifting of the axes of birefringence at the boundaries of the stressed regions.

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